A main beam welding fixture tooling

Abstract

The present invention relates to the technical field of automobile main beam welding, and discloses a main beam welding fixture, including a workbench, a mounting plate is provided on the workbench, a support frame is provided on the mounting plate, a main beam is placed on the support frame, a mounting frame 1 is provided on the top surface of the mounting plate, the support frame is arranged on both sides of the mounting frame 1 for sliding left and right, and an automatic clamping mechanism is provided at the front end of the support frame, an adaptive curved surface clamping mechanism is provided on one side of the mounting plate for sliding left and right, a sub-control driving mechanism is provided on the mounting plate and located at the rear side of the support frame, and a cam driving mechanism for driving the left and right support frames to move synchronously towards each other is provided in the mounting frame 1. Compared with the prior art, the beneficial effects of the present invention are: the main beam can be clamped and fixed in the front and back directions and the up and down directions at the same time, thereby improving the clamping efficiency and stability, and having a high degree of automation; the curved surface of the main beam can be clamped and fixed according to the positions of the main beams and curved surface structures of different sizes, thereby improving the stability of the main beam when clamped.

Description

Technical Field

[0001] The invention relates to the technical field of automobile main beam welding, in particular to a main beam welding fixture. Background Art

[0002] The main beam welding fixture is mainly used in the welding process of steel structures or other large-sized components to ensure welding accuracy and structural stability. The main beam usually has a large size and weight, and a high-precision fixture is required to fix the workpiece during welding to avoid dimensional deviation caused by thermal deformation during welding; the welding process of the main beam needs to ensure the strength and stability of the welded joint, and the fixture can fix the main beam to prevent the workpiece from moving or deforming during welding and affecting the welding quality; the use of special fixtures can improve the efficiency of the welding process, reduce the positioning and adjustment time of the workpiece, and thus speed up the production rhythm; the welding of large main beams involves high heat and stress, and the fixture can effectively fix the workpiece and reduce safety hazards during welding.

[0003] Ordinary adjustable clamps usually require manual adjustment by staff, and the position and height of the clamps are adjusted many times to achieve the clamping of the main beam. However, the adjustment process is complicated and the degree of automation is low, which reduces the efficiency of the main beam clamping. Combined clamps usually have multiple drive mechanisms to control each clamp to clamp the main beam. The advantage is that it can be controlled independently, but too many drive power mechanisms are required, and there is also a problem of power redundancy. In addition, since the main beam generally has a curved surface structure, due to this particularity, ordinary clamps cannot adaptively clamp and fix the curved surface, so the clamping stability of the main beam is low. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above difficulties and provide a main beam welding fixture.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: a main beam welding fixture tooling, comprising a workbench, a mounting plate is provided on the workbench, a support frame is provided on the mounting plate, and a main beam is placed on the support frame;

[0006] The top surface of the mounting plate is provided with a mounting frame 1, and the support frame is slidably arranged on both sides of the mounting frame 1, and an automatic clamping mechanism is arranged at the front end of the support frame, and an adaptive curved surface clamping mechanism is arranged on one side of the mounting plate for sliding left and right;

[0007] The mounting plate is provided with a sub-control driving mechanism located at the rear side of the support frame, and the mounting frame is provided with a cam driving mechanism for driving the left and right support frames to move synchronously toward each other, and the sub-control driving mechanism is respectively connected to the cam driving mechanism and the adaptive curved surface clamping mechanism;

[0008] The side of the workbench away from the adaptive curved surface clamping mechanism is provided with an adaptive end clamping mechanism for sliding back and forth.

[0009] As an improvement, the automatic clamping mechanism includes a connecting plate arranged at the front end of the support frame, and a cylinder 1 and a rotating rod 1 are hinged at the front and rear of the connecting plate respectively. The bottom of the rotating rod 1 is connected to a splint 1 bent toward the front side of the main beam. A sleeve is slidably sleeved on the rotating rod 1, and the top of the sleeve is hinged to the cylinder 1 and the connecting rod 1 in inner and outer layers respectively. The other end of the connecting rod 1 is hinged to a splint 2, and the middle part of the splint 2 is hinged to the top of the rotating rod 1.

[0010] As an improvement, the adaptive curved surface clamping mechanism includes a base one slidably arranged on the mounting plate, one side of the base one is slidably connected to a fixed frame, a mounting frame two is arranged on the upper side of the fixed frame, a cylinder two is arranged at the front end of the fixed frame and is hinged to the mounting frame two, a cylinder three is arranged on the mounting frame two, the telescopic axis of the cylinder three is located in the mounting frame two and a rotating wheel is rotatably arranged at the end, the left and right ends of the rotating wheel are respectively hinged to a slide plate arranged on the left and right inner walls of the mounting frame two through a connecting rod two, and a clamping block is arranged at the bottom of the slide plate.

[0011] As an improvement, the sub-control driving mechanism includes an assembly frame 1 and an assembly frame 2 which are arranged on the mounting plate and distributed front and back. The assembly frame 1 is rotatably provided with a rotating shaft 1 which is sleeved and fixed with a bevel gear 1. The assembly frame 2 is rotatably provided with a push rod which is sleeved and fixed with a bevel gear 2. The push rod can move axially on the assembly frame 2. The bevel gear 1 and the bevel gear 2 are meshed with each other. A stepping motor is provided at the end of the rotating shaft 1, and a push handle is provided at the end of the push rod. A fixed plate 2 is fixed on the mounting plate. A rotating shaft 2 is rotatably provided on the fixed plate 2. The bevel gear 2 is meshed with the bevel gear sleeved and fixed on the rotating shaft 2 in a three-cross manner. The other end of the rotating shaft 2 is provided with a crank driving unit hinged to the base 1. The other end of the push rod passes through the assembly frame 2 and is sleeved and fixed with a transmission gear 1. The mounting plate is provided with a second-stage transmission unit which can be detachably matched with the transmission gear 1.

[0012] As an improvement, the second-stage transmission unit includes a rotating frame fixed on the mounting plate, on which a transmission rod is rotatably provided, and one end of the transmission rod close to transmission gear one is provided with a clamping head that cooperates with transmission gear one, and the other end is sleeved and fixed with transmission gear two, and transmission gear two is connected to the cam drive mechanism for transmission cooperation.

[0013] As an improvement, the cam driving mechanism includes a rotating rod 2 rotatably arranged in a mounting frame 1, one end of the rotating rod 2 is sleeved and fixed with a matching gear meshing with the transmission gear 2, a pair of cams are sleeved and fixed in the middle, and the cams are provided with annular convex strips in a spiral structure and in opposite directions. The left and right sides of the mounting frame 1 located at the lower side of the rotating rod 2 are slidably provided with sliding rods, one end of the sliding rod is sleeved and fixed with a pulley slidably matched with the annular convex strip, and the other end is fixedly connected to the support frame.

[0014] As an improvement, the adaptive end clamping mechanism includes a base 2 which is slidably arranged on a workbench, side plates are fixed at the left and right ends of the base 2, a pair of moving blocks are slidably arranged on the top, fixed ear plates are arranged on the moving blocks, a moving rod is slidably arranged between the side plates, a clamping plate located in the fixed ear plate is rotatably arranged on the moving rod, a cam plate is arranged between the moving blocks, a rotating cylinder is rotatably arranged on the cam plate, the rotating cylinder and the bottom of the clamping plate are hinged by three connecting rods, a rotating rod is slidably arranged in the middle of the cam plate, both the cam plate and the rotating cylinder are provided with a slot that cooperates with the top of the rotating rod, the bottom end of the rotating rod passes through the base 2 and is connected to a rotating wrench, and a limit dial that cooperates with the rotating wrench is provided on the base 2.

[0015] As an improvement, a protective box for protecting the sub-control drive mechanism is provided on the mounting plate, the stepper motor is installed on the side of the protective box, the push handle is located outside the protective box and the push rod is slidably connected to the protective box.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. The automatic clamping mechanism can clamp and fix the main beam in the front and back, up and down directions at the same time, which improves the clamping efficiency and stability and has a high degree of automation;

[0018] 2. The adaptive curved surface clamping mechanism can clamp and fix the curved surface of the main beam according to the position of the main beam and curved surface structure of different sizes, thereby improving the stability of the main beam when clamping;

[0019] 3. Through the stepper motor and push handle, the adaptive curved surface clamping mechanism and the support frame movement can be independently controlled in stages at the same time. The adjustment process is simple and efficient, and the use of the power mechanism is reduced to avoid power redundancy.

[0020] 4. The cam drive mechanism can make the left and right support frames move synchronously towards each other, so that the position of the automatic clamping mechanism can be adjusted according to the length of the flat section of the main beam. The degree of automation is high, which improves the applicability of the fixture;

[0021] 5. Rotating the wrench can adjust the distance between the front and rear clamping plates and make them move self-centering, so that main beams of different widths can be clamped. In addition, pulling the wrench upward and continuing to rotate it can tighten the top ends of the front and rear clamping plates at the same time, applying clamping stress to the main beam between the clamping plates and improving the clamping and fixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the appearance of a main beam welding fixture tooling of the present invention Figure 1 .

[0023] Figure 2 This is a schematic diagram of the appearance of a main beam welding fixture tooling of the present invention Figure 2 .

[0024] Figure 3 It is an exploded view of a main beam welding fixture tooling of the present invention.

[0025] Figure 4 It is a schematic diagram of an automatic clamping mechanism of a main beam welding fixture tooling of the present invention.

[0026] Figure 5 This is a schematic diagram of an adaptive curved surface clamping mechanism of a main beam welding fixture of the present invention. Figure 1 .

[0027] Figure 6 This is a main beam welding fixture tooling of the present invention Figure 5 An enlarged schematic diagram of point A.

[0028] Figure 7 This is a schematic diagram of an adaptive curved surface clamping mechanism of a main beam welding fixture of the present invention. Figure 2 .

[0029] Figure 8 This is a schematic diagram of a sub-control driving mechanism of a main beam welding fixture tooling of the present invention Figure 1 .

[0030] Fig. 9 This is a schematic diagram of a sub-control driving mechanism of a main beam welding fixture tooling of the present invention Figure 2 .

[0031] Fig.10 The invention discloses a schematic diagram of a driving mechanism of a main beam welding fixture.

[0032] Fig.11 It is a schematic diagram of an adaptive end clamping mechanism of a main beam welding fixture tooling of the present invention.

[0033] Fig.12 This is a main beam welding fixture tooling of the present invention Fig.11 An enlarged schematic diagram of point B.

[0034] Fig.13 It is an exploded view of an adaptive end clamping mechanism of a main beam welding fixture tooling of the present invention.

[0035] Fig.14 It is a cross-sectional view of an adaptive end clamping mechanism of a main beam welding fixture tooling of the present invention.

[0036] Fig.15 This is a main beam welding fixture tooling of the present invention Fig.14 Enlarged schematic diagram of point C.

[0037] As shown in the figure: 1. Workbench; 2. Mounting plate; 3. Support frame; 4. Main beam; 5. Mounting frame 1; 6. Automatic clamping mechanism; 61. Connecting plate; 62. Cylinder 1; 63. Turning rod 1; 64. Clamping plate 1; 65. Sleeve; 66. Connecting rod 1; 67. Clamping plate 2; 7. Adaptive curved surface clamping mechanism; 71. Base 1; 72. Fixed frame; 73. Cylinder 2; 74. Mounting frame 2; 75. Cylinder 3; 76. Rotating wheel; 77. Slide plate; 78. Connecting rod 2; 79. Clamping block; 8. Sub-control driving mechanism; 81. Assembly frame 1; 82. Assembly frame 2; 83. Bevel gear 1; 84. Rotating shaft 1; 85. Bevel gear 2; 86. Push rod; 87. Stepping motor; 88. Push handle; 89. Fixed plate 2; 810. Rotating shaft 2; 811. Bevel gear three; 812, transmission gear one; 9, cam drive mechanism; 91, rotating rod two; 92, matching gear; 93, cam; 94, annular convex strip; 95, sliding rod; 96, pulley; 10, adaptive end clamping mechanism; 101, base two; 102, side plate; 103, moving block; 104, fixed ear plate; 105, moving rod; 106, clamping plate; 107, cam plate; 108, rotating drum; 109, connecting rod three; 1010, rotating rod; 1011, rotating wrench; 1012, limit dial; 1013, card slot; 1014, tension spring; 11, crank drive unit; 12, second-order transmission unit; 121, rotating frame; 122, transmission rod; 123, card head; 124, transmission gear two; 13, protective box. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0039] Combined with Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 As shown, a main beam welding fixture tooling includes a workbench 1, a mounting plate 2 is provided on the workbench 1, a support frame 3 is provided on the mounting plate 2, a main beam 4 is placed on the support frame 3, a mounting frame 5 is provided on the top surface of the mounting plate 2, the support frame 3 is slidably arranged on both sides of the mounting frame 5, and an automatic clamping mechanism 6 is provided at the front end of the support frame 3, and an adaptive curved surface clamping mechanism 7 is provided on one side of the mounting plate 2 for sliding left and right;

[0040] The mounting plate 2 is provided with a sub-control driving mechanism 8 located at the rear side of the support frame 3, and the mounting frame 1 5 is provided with a cam driving mechanism 9 for driving the left and right support frames 3 to move synchronously toward each other, and the sub-control driving mechanism 8 is respectively connected to the cam driving mechanism 9 and the adaptive curved surface clamping mechanism 7;

[0041] An adaptive end clamping mechanism 10 is provided on a side of the workbench 1 away from the adaptive curved surface clamping mechanism 7 for sliding back and forth.

[0042] The working principle of the present invention is as follows: according to the size of the main beam 4, the position of the adaptive curved surface clamping mechanism 7 on the mounting plate 2 is adjusted by controlling the sub-control driving mechanism 8. Through the cooperation of the sub-control driving mechanism 8 and the cam driving mechanism 9, the support frames 3 on the left and right sides can be driven to move synchronously toward each other until they are suitable. Then, the middle part of the main beam 4 is synchronously clamped in the up and down and front and back directions through the automatic clamping mechanism 6. Then, the position of the adaptive end clamping mechanism 10 on the workbench 1 is adjusted to adaptively clamp and fix the other end of the main beam 4. The overall automation is relatively high, and the clamping of the main beam 4 is convenient, efficient, and more stable.

[0043] Combined with Figure 1 , Attachment Figure 4 As shown, a connecting plate 61 is fixedly connected to the bottom of the front end of the support frame 3, and a cylinder 62 and a rotating rod 63 are hinged to the front and rear of the top of the connecting plate 61 respectively. A clamping plate 64 bent toward the front side of the main beam 4 is connected to the bottom of the rotating rod 63. A sleeve 65 is slidably sleeved on the middle of the rotating rod 63. The top of the sleeve 65 is hinged to the telescopic shaft end of the cylinder 62 and the connecting rod 66 in layers inside and outside respectively. The other end of the connecting rod 66 is hinged to a clamping plate 67. The middle of the clamping plate 67 is hinged to the top of the rotating rod 63, and a telescopic spring is provided between the top of the rotating rod 63 and the sleeve 65.

[0044] The working principle of the automatic clamping mechanism 6 for clamping and fixing the main beam 4 in the up and down and front and back directions is as follows: the cylinder 62 is driven to extend, driving the rotating rod 63 to rotate toward the direction of the support frame 3, thereby driving the clamping plate 64 to move until it is in contact with the side of the main beam 4, and then the cylinder 62 continues to drive the sleeve 65 to move upward on the rotating rod 63. Since the top of the sleeve 65 is hinged with a connecting rod 66, the other end of the connecting rod 66 is hinged with a clamping plate 67, and the middle part of the clamping plate 67 is hinged to the top of the rotating rod 63, the sleeve 65 moves upward and drives the rear end of the clamping plate 67 to rotate downward until it is in contact with the top surface of the main beam 4, thereby achieving automatic clamping.

[0045] Combined with Figure 2 , Attachment Figure 5 , Attachment Figure 6 , Attachment Figure 7As shown, a base 71 is provided on one side of the mounting plate 2 for sliding left and right, and a fixing frame 72 is slidably connected to one side of the base 71. A spring is fixedly connected between the bottom of the fixing frame 72 and the top surface of the base 71. A mounting frame 2 74 is hinged on the top of the fixing frame 72, and a cylinder 2 73 is provided at the front end. The telescopic shaft end of the cylinder 2 73 is hinged to the front end of the mounting frame 2 74. The mounting frame 24 is a U-shaped structure, and a cylinder 3 75 is fixed on the top surface. The telescopic shaft of the cylinder 3 75 passes through the top plate of the mounting frame 2 74 and is located in the mounting frame 2 74, and a rotating wheel 76 is rotatably provided at the end. The left and right ends of the rotating wheel 76 are respectively hinged to a slide plate 77 arranged on the left and right inner walls of the mounting frame 2 74 through a connecting rod 2 78. The slide plate 77 is slidably arranged in the slide groove, and a clamping block 79 is provided at the bottom of the slide plate 77, wherein the bottom surface of the clamping block 79 on the side close to the curved surface of the main beam 4 is a curved surface structure, and the bottom surface of the clamping block 79 on the other side is a flat structure.

[0046] The working principle of the adaptive curved surface clamping mechanism 7 for clamping and fixing the curved surface of the main beam 4 is as follows: the adaptive curved surface clamping mechanism 7 should be located at the junction of the curved surface and the flat surface of the main beam 4 so as to clamp and fix the curved surface structure on the main beam 4. The driving cylinder 2 73 is extended and retracted, which can drive the mounting frame 2 74 to fall directly above the main beam 4, and then the driving cylinder 3 75 is extended. The telescopic shaft end of the cylinder 3 75 drives the rotating wheel 76 to move downward, and under the action of the connecting rod 2 78, the sliding plate 77 is driven to move downward. When the clamping block 79 at the bottom of the sliding plate 77 on one side abuts against the plane of the main beam 4, the sliding plate 77 on the other side can continue to move downward until the clamping block 79 on it abuts against the curved surface of the main beam 4, completing the clamping and fixing of the curved surface of the main beam 4.

[0047] Combined with Figure 2 , Attachment Figure 8 , Attachment Fig. 9 , Attachment Fig.10As shown, the top surface of the mounting plate 2 is provided with an assembly frame 1 81 and an assembly frame 2 82 which are located at the rear side of the support frame 3 and are distributed front and back. A rotating shaft 1 84 with a bevel gear 1 83 fixedly sleeved thereon is rotatably provided on the assembly frame 1 81, and a push rod 86 with a bevel gear 2 85 fixedly sleeved thereon is rotatably provided on the assembly frame 2 82. The push rod 86 can move axially on the assembly frame 2 82, and the bevel gear 1 83 and the bevel gear 2 85 are meshed with each other, and the width of the bevel gear 2 85 is half of the bevel gear 1 83. The rotating shaft 1 84 The end of the push rod 86 is provided with a stepping motor 87, the end of the push rod 86 is provided with a push handle 88, the mounting plate 2 is fixed with a fixing plate 2 89 located at the rear side of the assembly frame 1 81, the fixing plate 2 89 is rotatably provided with a rotating shaft 2 810, the bevel gear 2 85 is cross-engaged with the bevel gear 3 811 sleeved and fixed on the rotating shaft 2 810, so that the rotation directions of the push rod 86 and the rotating shaft 2 810 are perpendicular to each other, and the bevel gear 2 85 can be completely separated from the bevel gear 3 811 when moving, and the rotating shaft 2 810 is another A crank driving unit 11 is provided at the end thereof, and the crank driving unit 11 includes a crank fixed at the end of the second rotating shaft 810, and the other end of the crank is rotatably connected to a connecting rod, and the other end of the connecting rod is hinged to the base 71, and the other end of the push rod 86 passes through the assembly frame 82 and is sleeved and fixed with a transmission gear 812, and the mounting plate 2 is provided with a second-order transmission unit 12 that can be detachably matched with the transmission gear 812, and the second-order transmission unit 12 includes a rotating frame 121 fixed on the mounting plate 2, and the rotating frame 121 The upper rotating part is provided with a transmission rod 122, one end of the transmission rod 122 passes through the rotating frame 121 and is sleeved and fixed with a clamp head 123 that is engaged with the transmission gear 1 812, a certain gap is left between the clamp head 123 and the transmission gear 1 812, and the end of the transmission gear 1 812 close to the rotating frame 121 can be slidably connected with the barrel of the clamp head 123, and the other end of the transmission rod 122 is sleeved and fixed with a transmission gear 2 124, and the transmission gear 2 124 is transmission-coordinated with the cam driving mechanism 9. A protection box 13 for protecting the sub-control driving mechanism 8 is provided on the mounting plate 2, and the stepping motor 87 is installed on the side of the protection box 13, the push handle 88 is located outside the protection box 13, and the push rod 86 is slidably connected with the protection box 13.

[0048] The working principle of the separate control driving mechanism 8 for independently controlling the adaptive curved surface clamping mechanism 7 and the cam driving mechanism 9 is as follows: when the bevel gear three 811 and the bevel gear two 85 are in a normal meshing state, the stepper motor 87 is driven to work, driving the rotating shaft 1 84 to rotate, and under the mutual meshing of the bevel gear one 83 and the bevel gear two 85, the push rod 86 is driven to rotate, and then under the mutual meshing of the bevel gear three 811 and the bevel gear two 85, the rotating shaft two 810 is driven to rotate, thereby driving the adaptive curved surface clamping mechanism 7 to perform left and right cyclic reciprocating motion through the crank driving unit 11 until it slides to a suitable position, and the stepper motor 87 stops working. At this time, the transmission gear one 812 on the push rod 86 is separated from the clamping head 123, so that there is no linkage with the second-order transmission unit 12, so at this time the separate control driving mechanism 8 and the cam driving mechanism 9 does not transmit power; when the sub-control driving mechanism 8 needs to not be linked with the adaptive curved surface clamping mechanism 7 and thus transmit power to the cam driving mechanism 9, the push handle 88 is pushed to make the push rod 86 move in the direction of the rotating frame 121. Since the bevel gear 2 85 is cross-vertically meshed with the bevel gear 3 811, the bevel gear 2 85 can be separated from the bevel gear 3 811 when moving, and the transmission connection with the adaptive curved surface clamping mechanism 7 is disconnected. At this time, the transmission gear 1 812 at one end of the push rod 86 is fixedly engaged with the clamping head 123 to drive the stepping motor 87 to work, and the bevel gear 1 83 drives the push rod 86 to rotate, so that the transmission gear 1 812 can drive the transmission rod 122 to rotate under the cooperation of the clamping head 123, and the transmission gear 2 124 fixed on the other end of the transmission rod 122 rotates to complete the transmission connection with the cam driving mechanism 9.

[0049] Combined with Figure 3 , Attachment Fig.10 As shown, a rotating rod 91 is rotatably provided inside the mounting frame 15, one end of the rotating rod 91 is sleeved and fixed with a matching gear 92 meshing with the transmission gear 124, and a pair of cams 93 are sleeved and fixed in the middle, and the cams 93 are provided with annular convex strips 94 in spiral structure and in opposite directions, and the left and right sides of the mounting frame 15 located under the rotating rod 91 are slidably provided with sliding rods 95, one end of the sliding rod 95 is sleeved and fixed with a pulley 96 slidably matched with the annular convex strip 94, and the other end is fixedly connected to the support frame 3.

[0050] The working principle of the cam driving mechanism 9 driving the support frames 3 on the left and right sides to move towards each other at the same distance is as follows: the transmission gear 2 124 drives the matching gear 92 to rotate, thereby driving the rotating rod 2 91 to rotate, and a pair of cams 93 sleeved and fixed on the rotating rod 2 91 rotate accordingly. Since the pulley 96 sleeved and fixed on the slide bar 95 is slidably connected with the annular convex strip 94 on the cam 93, and the annular convex strips 94 on the left and right cams 93 are in opposite directions, the rotation of the cam 93 can drive the pulleys 96 on the left and right sides to move back and forth at the same distance towards each other, so that the slide bar 95 can drive the support frames 3 on the left and right sides to move back and forth at the same distance towards each other until they move to the appropriate position and stop the stepper motor 87.

[0051] Combined with Figure 3 , Attachment Fig.11 , Attachment Fig.12 , Attachment Fig.13 , Attachment Fig.14 and attached Fig.15 As shown, a base 101 is provided on one side of the top surface of the workbench 1 for sliding back and forth, side plates 102 are fixed on the left and right ends of the base 101, a pair of moving blocks 103 are slidably provided on both sides of the top surface, a tension spring 1014 is connected between the ends of the moving blocks 103, fixed ear plates 104 are fixed on opposite sides of the top surface of the moving blocks 103, a moving rod 105 is slidably provided between the side plates 102, a clamping plate 106 located in the fixed ear plate 104 is rotatably provided in the middle part of the rod body of the moving rod 105, the clamping plate 106 is slidably connected to the fixed ear plate 104, a cam plate 107 placed on the top surface of the base 101 is provided between the moving blocks 103, and the cam plate 107 is a semicircular structure with left and right ends butted, A fixed groove is reserved in the middle part, and a rotating cylinder 108 is rotatably provided on the cam disc 107. The rotating cylinder 108 and the bottom of the clamping plate 106 are hinged by a connecting rod three 109. A rotating rod 1010 is slidably provided in the fixed groove in the middle part of the cam disc 107. Both the cam disc 107 and the rotating cylinder 108 are provided with a slot 1013 that cooperates with the top of the rotating rod 1010, and a fixed groove connected to the slot 1013 is provided in the cam disc 107. The fixed groove can be fixed by a clamping block at the top of the rotating rod 1010. After the bottom end of the rotating rod 1010 passes through the base two 101, a rotating wrench 1011 is connected. The base two 101 is provided with a limit dial 1012 that cooperates with the rotating wrench 1011.

[0052] The working principle of the adaptive end clamping mechanism 10 for adaptively clamping the main beams 4 of different thicknesses is as follows: according to the position of the end of the main beam 4, the movable base 101 makes the clamping plates 106 on the left and right sides be located on both sides of the end of the main beam 4, and the rotating wrench 1011 is rotated to drive the rotating rod 1010 to rotate, thereby driving the cam plate 107 to rotate. Under the rotation of the cam plate 107, the moving blocks 103 move away from each other, and the tension springs 1014 between the ends of the moving blocks 103 make the moving blocks on the front and rear sides always fit with the cam plate 107 until the opposite sides of the clamping plates 106 on the left and right sides fit with the sides of the main beam 4, which can be used for The main beams 4 of different thicknesses are clamped; then the rotating wrench 1011 is pulled upward to drive the rotating rod 1010 to move upward until the top of the rotating rod 1010 extends into the rotating cylinder 108, and the rotating wrench 1011 is continued to be rotated to drive the rotating cylinder 108 to rotate. Since the rotating cylinder 108 and the bottom of the clamping plate 106 are hinged by the connecting rod three 109, the bottom of the clamping plates 106 on the front and rear sides will rotate synchronously around the moving rod 105 on the same side, so that the tops of the clamping plates 106 on the front and rear sides gradually approach each other, and a clamping prestress is applied to the main beam 4 placed between the clamping plates 106, thereby improving the clamping and fixing effect, and making it more stable. It is particularly important to note that the clamping of the main beam 4 by the clamping plate 106 is carried out in two steps. The first step is to drive the clamping plate 106 to move synchronously so that the distance between the two matches the width of the main beam 4. The second step is to pull up and rotate the wrench 1011 to cooperate with the rotating drum 108, driving the tops of the clamping plates 106 on the left and right sides to gradually approach each other, applying clamping prestress to the main beam 4, thereby improving the clamping stability.

[0053] In addition, the following supplementary explanations are given: a box cover is provided on the top of the protection box 13, a lifting handle is provided on the top surface of the box cover, a pair of limiting columns are provided at the rear end of the top surface of the support frame 3, and the top of the fixing frame 72 is a supporting structure.

[0054] During the specific implementation of the present invention, when the main beam 4 of the automobile needs to be welded and clamped, first, according to the size of the main beam 4, the adaptive curved surface clamping mechanism 7 is driven to move to a suitable position through the separate control driving mechanism 8 so that the curved surface on the main beam 4 can be clamped, and then the support frames 3 on the left and right sides are driven to move toward each other synchronously through the cooperation of the separate control driving mechanism 8 and the cam driving mechanism 9, so that the support frames 3 on the left and right sides are both located at the two ends of the flat section of the main beam 4, and then the main beam 4 is clamped and fixed through the adaptive curved surface clamping mechanism 7 and the automatic clamping mechanism 6, and then the end clamping and fixing is performed according to the width of the main beam 4 through the adaptive end clamping mechanism 10. Through the mutual cooperation between the various mechanisms, the main beam 4 can be clamped stably and quickly, and can be adaptively matched and clamped according to the external dimensions of the main beam 4, which greatly improves the applicability of the fixture.

[0055] It is worth mentioning that the cylinder 1 62, cylinder 2 73, cylinder 3 75 and stepper motor 87 in the present invention are all existing equipment well known to those skilled in the art, and their circuit connection methods and use control methods are all existing technologies.

[0056] The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and do not deviate from the purpose of the invention, they can creatively design a structure and embodiment similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. A main beam welding fixture, comprising a workbench (1), a mounting plate (2) being provided on the workbench (1), a support frame (3) being provided on the mounting plate (2), a main beam (4) being placed on the support frame (3), characterized in that: The top surface of the mounting plate (2) is provided with a mounting frame (5), the support frame (3) is slidably arranged on both sides of the mounting frame (5), and an automatic clamping mechanism (6) is provided at the front end of the support frame (3), and an adaptive curved surface clamping mechanism (7) is provided on one side of the mounting plate (2) for sliding left and right; The mounting plate (2) is provided with a sub-control driving mechanism (8) located at the rear side of the support frame (3); the mounting frame (5) is provided with a cam driving mechanism (9) for driving the left and right support frames (3) to move synchronously towards each other; the sub-control driving mechanism (8) is respectively connected to the cam driving mechanism (9) and the adaptive curved surface clamping mechanism (7); An adaptive end clamping mechanism (10) is provided on a side of the workbench (1) away from the adaptive curved surface clamping mechanism (7) for sliding back and forth; The automatic clamping mechanism (6) comprises a connecting plate (61) arranged at the front end of the support frame (3), the connecting plate (61) is hinged with a cylinder (62) and a rotating rod (63) at the front and rear ends thereof, the bottom of the rotating rod (63) is connected with a clamping plate (64) bent toward the front side of the main beam (4), a sleeve (65) is slidably sleeved on the rotating rod (63), the top of the sleeve (65) is hinged with the cylinder (62) and the connecting rod (66) at the inner and outer layers, the other end of the connecting rod (66) is hinged with a clamping plate (67), the middle part of the clamping plate (67) is hinged with the top of the rotating rod (63); The self-adaptive curved surface clamping mechanism (7) comprises a base (71) slidably arranged on the mounting plate (2), a fixing frame (72) is slidably connected to one side of the base (71), a mounting frame (74) is hingedly connected to the top of the fixing frame (72), a cylinder (73) is provided at the front end of the fixing frame (72) and is hingedly connected to the mounting frame (74), a cylinder (75) is provided on the mounting frame (74), a telescopic shaft of the cylinder (75) is located in the mounting frame (74) and a rotating wheel (76) is rotatably arranged at the end thereof, the left and right ends of the rotating wheel (76) are respectively hingedly connected to a slide plate (77) arranged on the left and right inner walls of the mounting frame (74) through a connecting rod (78), and a clamping block (79) is provided at the bottom of the slide plate (77); The sub-control driving mechanism (8) comprises an assembly frame 1 (81) and an assembly frame 2 (82) arranged on the mounting plate (2) in a front-rear distribution. The assembly frame 1 (81) is rotatably provided with a rotating shaft 1 (84) sleeved and fixed with a bevel gear 1 (83). The assembly frame 2 (82) is rotatably provided with a push rod (86) sleeved and fixed with a bevel gear 2 (85). The push rod (86) can move axially on the assembly frame 2 (82). The bevel gear 1 (83) and the bevel gear 2 (85) are meshed with each other. A stepping motor (87) is provided at the end of the rotating shaft 1 (84). A push handle is provided at the end of the push rod (86). (88), a second fixing plate (89) is fixed on the mounting plate (2), a second rotating shaft (810) is rotatably provided on the second fixing plate (89), a second bevel gear (85) is cross-engaged with a third bevel gear (811) sleeved and fixed on the second rotating shaft (810), the other end of the second rotating shaft (810) is provided with a crank drive unit (11) hinged to the first base (71), the other end of the push rod (86) passes through the second assembly frame (82) and is sleeved and fixed with a transmission gear (812), and the mounting plate (2) is provided with a second-stage transmission unit (12) that can be detachably matched with the transmission gear (812); The second-stage transmission unit (12) comprises a rotating frame (121) fixed on the mounting plate (2), a transmission rod (122) being rotatably provided on the rotating frame (121), a clamping head (123) being provided at one end of the transmission rod (122) close to the transmission gear 1 (812) and being engaged with the transmission gear 1 (812), and a transmission gear 2 (124) being sleeved and fixed at the other end, and the transmission gear 2 (124) being transmission-coordinatedly connected with the cam driving mechanism (9); The cam driving mechanism (9) comprises a rotating rod (91) rotatably arranged in the mounting frame (5), one end of the rotating rod (91) is sleeved and fixed with a matching gear (92) meshing with the transmission gear (124), a pair of cams (93) are sleeved and fixed in the middle, and the cams (93) are each provided with an annular convex strip (94) in a spiral structure and in opposite directions, and the left and right sides of the mounting frame (5) located below the rotating rod (91) are both slidably provided with a slide rod (95), one end of the slide rod (95) is sleeved and fixed with a pulley (96) slidably matched with the annular convex strip (94), and the other end is fixedly connected to the support frame (3); The adaptive end clamping mechanism (10) comprises a base (101) slidably arranged on a workbench (1) in a forward and backward direction, side plates (102) being fixed at the left and right ends of the base (101), a pair of moving blocks (103) being slidably arranged on the top, a fixed ear plate (104) being arranged on the moving block (103), a moving rod (105) being slidably arranged between the side plates (102), a clamping plate (106) being rotatably arranged on the moving rod (105) and being located in the fixed ear plate (104), a cam plate (107) being arranged between the moving blocks (103), and the cam plate (107) A rotating cylinder (108) is rotatably provided on the upper part, and the rotating cylinder (108) is hinged to the bottom of the clamping plate (106) through a third connecting rod (109). A rotating rod (1010) is slidably provided in the middle of the cam plate (107). Both the cam plate (107) and the rotating cylinder (108) are provided with a slot (1013) that cooperates with the top of the rotating rod (1010). The bottom end of the rotating rod (1010) passes through the second base (101) and is connected to a rotating wrench (1011). The second base (101) is provided with a limit dial (1012) that cooperates with the rotating wrench (1011).

2. The main beam welding fixture according to claim 1, characterized in that: The mounting plate (2) is provided with a protection box (13) for protecting the sub-control drive mechanism (8), the stepping motor (87) is mounted on the side of the protection box (13), the push handle (88) is located outside the protection box (13), and the push rod (86) is slidably connected to the protection box (13).

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