Welding tool suitable for automobile front floor

Abstract

The invention discloses a welding tool suitable for an automobile front floor. The welding tool comprises a movable welding gun and a rotary clamp used for fixing the front floor. The movable welding gun comprises a transverse moving mechanism, a longitudinal moving mechanism is arranged on the transverse moving mechanism, and an electrode holder mechanism is arranged on the longitudinal moving mechanism. The rotating clamp comprises a first base, a slewing bearing is rotatably arranged on the first base, a supporting block is arranged on the slewing bearing, and a protrusion matched with an opening of the front floor is arranged at the top of the supporting block; the clamp has the beneficial effects that a workpiece is fixed by rotating the clamp, the workpiece is installed on the clamp through the protrusions firstly, then the workpiece is pressed through the eccentric pins, and the situation that the workpiece is driven by a welding gun to be disengaged from the clamp in the operation process is avoided; the movable welding gun can move back and forth and up and down, and the rotary clamp is matched to drive the workpiece to rotate, so that the welding gun can be used for welding any welding spot position on the workpiece.

Description

Technical Field

[0001] The present invention relates to the field of automobile parts welding equipment, and particularly relates to a welding fixture suitable for the front floor of an automobile. Background Art

[0002] Currently, when welding the front floor of an automobile, mainly two operators are used for manual welding. Since the front floor parts are relatively large, in order to reduce the number of steps during operation, a rotary fixture is used to fix the front floor, and the operator rotates the fixture while working. The existing welding method has the following problems: First, the manual welding efficiency is relatively low. Second, because the operating speeds of the two welding tongs are different during operation, the two operators cannot work simultaneously and can only work successively. Therefore, one operator is in a waiting state during welding. By analyzing the operation time of the front floor, it is found that the waiting time accounts for 42.03% of the operation time, which is a very high proportion and a great waste.

[0003] Therefore, our company has developed a welding fixture suitable for the front floor of an automobile. Summary of the Invention

[0004] The purpose of the present invention is to provide a welding fixture suitable for the front floor of an automobile, which realizes the automatic welding of the front floor and improves the welding efficiency.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A welding fixture suitable for the front floor of an automobile, comprising a moving welding gun and a rotary fixture for fixing the front floor; The moving welding gun includes a transverse movement mechanism, a longitudinal movement mechanism is arranged on the transverse movement mechanism, and a welding tong mechanism is arranged on the longitudinal movement mechanism; The rotary fixture includes a first base, a slewing bearing is rotatably arranged on the first base, a support block is arranged on the slewing bearing, and a protrusion matching the opening of the front floor is arranged on the top of the support block.

[0006] Preferably, a first motor for driving the slewing bearing to rotate is arranged on the first base; A connecting arm is arranged on the slewing bearing, and the support block is located at the end of the connecting arm.

[0007] Preferably, a circular hole is penetratively arranged in the support block, a rotating shaft is arranged in the circular hole, and an eccentric pin for pressing the front floor is arranged on the top of the rotating shaft; The height of the protrusion above the upper end surface of the support block is the same as the thickness of the front floor.

[0008] Preferably, a telescopic arm is arranged on the connecting arm, one end of the telescopic arm is connected to the connecting arm, and the other end of the telescopic arm is connected to the rotating shaft through a steering rod; The telescopic arm drives the rotating shaft to rotate in the circular hole by telescoping.

[0009] Preferably, the transverse movement mechanism includes a second base, a second lead screw is arranged inside the second base, and the second lead screw is connected to a second motor; A second nut pair cooperating with the second lead screw is arranged on the longitudinal movement mechanism.

[0010] Preferably, the longitudinal movement mechanism includes a second support, and the second nut pair is located at the bottom of the second support; A third lead screw is arranged on the second support, and the third lead screw is connected to a third motor; A third nut pair cooperating with the third lead screw is arranged on the welding tongs mechanism.

[0011] Preferably, the welding tongs mechanism includes a third support, and the third nut pair is located on the side wall of the third support; A bracket is arranged on the third support, and the bracket is connected to the welding tongs through a pin shaft.

[0012] Preferably, the welding tongs include a first welding tong and a second welding tong; The welding tongs mechanism further includes a cylinder for controlling the opening and closing of the first welding tong and the second welding tong. An air inlet hole and an air outlet hole are arranged on the cylinder. A first pneumatic rod is arranged on the side wall of the first welding tong, and a second pneumatic rod is arranged on the side wall of the second welding tong. Both the first pneumatic rod and the second pneumatic rod are connected to a support block, and the support block is communicated with the cylinder.

[0013] Preferably, a first water inlet and outlet hole for cooling is arranged on the side wall of the first welding tong, and a second water inlet and outlet hole for cooling is arranged on the side wall of the second welding tong.

[0014] Preferably, a guide rod is arranged on the second support, and a buffer sleeve cooperating with the guide rod is arranged on the side wall of the third support; A spring is arranged outside the guide rod, and two ends of the spring are respectively connected to the buffer sleeve and the second support.

[0015] The beneficial effects of the present invention are as follows: 1. The workpiece is fixed by the rotary fixture. First, the workpiece is installed on the fixture through the protrusion, and then the workpiece is pressed tightly through the eccentric pin, so as to prevent the workpiece from being disengaged from the fixture by the welding torch during the operation.

[0016] 2. The movement of the welding torch can realize the forward and backward, up and down movements. Combined with the rotation of the workpiece driven by the rotary fixture, the welding of any welding point position on the workpiece by the welding torch can be realized.

[0017] 3. The spring forms a support for the welding tongs mechanism, avoiding the downward movement trend of the welding tongs mechanism under the action of its own gravity, which may cause the third nut pair to drive the third lead screw to rotate, and further cause damage to the third motor.

[0018] 4. The side walls of both the first welding tongs and the second welding tongs are provided with water inlet and outlet holes for cooling to avoid the phenomenon of excessive temperature rise of the equipment during long-term operation.

[0019] 5. The opening and closing of the first welding tongs and the second welding tongs are controlled by a cylinder. During welding, they are brought into contact to weld the solder joint position on the workpiece, ensuring complete penetration. After welding is completed, when the workpiece is rotated or the welding torch is moved, they are opened to avoid interference and collision with the workpiece during this process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall schematic diagram of the present invention; Figure 2 is the perspective view of the rotary fixture; Figure 3 is the assembled perspective view of the connecting arm and the telescopic arm; Figure 4 is the perspective view of the connecting arm; Figure 5 is the perspective view of the telescopic arm; Figure 6 is the perspective view of the movable welding torch; Figure 7 is the perspective view of the transverse movement mechanism; Figure 8 is the perspective view of the longitudinal movement mechanism; Figure 9 is the perspective view of the longitudinal movement mechanism from another angle; Figure 10 is the perspective view of the welding torch mechanism; Figure 11 is the perspective view of the welding torch mechanism from another angle; Figure 12 is the perspective view of the first welding tongs and the second welding tongs.

[0021] The drawings are only for illustrative purposes and should not be construed as a limitation of this patent; for a better illustration of this embodiment, some components in the drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described below with reference to the drawings. Embodiment

[0023] As Figure 1As shown in the figure, a welding tooling suitable for the front floor of an automobile according to an embodiment of the present invention includes a movable welding gun 200 and a rotary fixture 100 for fixing the front floor; the rotary fixture 100 can drive the front floor to rotate, and the movable welding gun 200 can move back and forth and up and down, so that the movable welding gun 200 can contact any welding point position on the front floor, realizing the automation of welding.

[0024] As Figure 6 shown, the movable welding gun 200 includes a transverse movement mechanism 21, a longitudinal movement mechanism 22 is arranged on the transverse movement mechanism 21, and a welding tong mechanism 23 is arranged on the longitudinal movement mechanism 22; thus realizing the movement of the movable welding gun 200 in the front-back and up-down directions.

[0025] As Figure 2 and Figure 4 shown, the rotary fixture 100 includes a first base 11, a slewing bearing 12 is rotatably arranged on the first base 11, four support blocks 143 are arranged on the slewing bearing 12, a protrusion 144 is arranged on the top of the support block 143, and correspondingly, four openings are arranged on the front floor. The relative positional relationship between the four openings is the same as the positional relationship of the protrusions 144 on the tops of the four support blocks 143, and the sizes of the openings and the protrusions 144 are also the same. In this way, the front floor can be installed on the rotary fixture 100 and preliminarily fixed, and the slewing bearing 12 can drive the front floor to rotate along the first base 11.

[0026] A first motor 13 for driving the slewing bearing 12 to rotate is arranged on the first base 11. A dividing plate is arranged at the lower part of the slewing bearing 12 to record the rotation angle of the slewing bearing 12, so as to timely analyze the welding point position of the front floor workpiece at this angle, so that the movable welding gun 200 can accurately move to the welding point; A connecting arm 141 is arranged on the slewing bearing 12, and the support block 143 is located at the end of the connecting arm 141. The connecting arm 141 is fixed to the slewing bearing 12 through a first fixing block 142.

[0027] As Figure 3 — Figure 5 shown, a round hole 145 is penetratively arranged in the support block 143, a rotating shaft 154 is arranged in the round hole 145, and an eccentric pin 155 for pressing the front floor is arranged at the top of the rotating shaft 154; The height of the protrusion 144 above the upper end surface of the support block 143 is the same as the thickness of the front floor.

[0028] A telescopic arm 151 is arranged on the connecting arm 141. The telescopic arm 151 is fixed to the connecting arm 141 through a second fixing block 152. The other end of the telescopic arm 151 is connected to the rotating shaft 154 through a steering rod 153; The telescopic arm 151 drives the rotating shaft 154 to rotate in the round hole 145 by telescoping.

[0029] When the front floor needs to be loaded into the rotary fixture 100 or taken out from the rotary fixture 100, the telescopic arm 151 extends and retracts to drive the rotary shaft 154 to rotate until the outer shape of the eccentric pin 155 overlaps with the outer shape of the protrusion 144 in the vertical direction, so that the front floor can be smoothly loaded or taken out for the next welding step. Since when the moving welding torch 200 contacts or disengages from the welding point of the front floor during the welding process, a large force in the up and down direction will be generated on the front floor, which may cause the front floor to disengage from the rotary fixture 100. Therefore, before welding, the front floor needs to be fixed twice. By the extension and retraction of the telescopic arm 151, the rotary shaft 154 drives the eccentric pin 155 to rotate. When the outer shape of the eccentric pin 155 does not overlap with the outer shape of the protrusion 144 in the vertical direction, the eccentric pin 155 will press against the upper end surface of the front floor to prevent it from disengaging from the rotary fixture 100.

[0030] In this embodiment, eccentric pins 155 are provided on two connecting arms 141 in approximately diagonal positions among the four connecting arms 141. According to the different forces generated by the moving welding torch 200, the number of eccentric pins 155 can also be increased or decreased.

[0031] As Figure 7 shown, the transverse movement mechanism 21 includes a second base 211, and a second lead screw 213 is arranged in the second base 211. The second lead screw 213 is connected to a second motor 212.

[0032] As Figure 8 and Figure 9 shown, a second nut pair 221 that cooperates with the second lead screw 213 is arranged on the longitudinal movement mechanism 22. The second motor 212 drives the second lead screw 213 to rotate, and then drives the second nut pair 221 to move, driving the longitudinal movement mechanism 22 (and then driving the welding tongs mechanism 23) arranged thereon to move back and forth. By calculating the number of turns of the second motor 212, the front and back positions of the welding torch can be obtained.

[0033] A second track 214 parallel to the second lead screw 213 is also arranged in the second base 211, and a second slider 222 that cooperates with the second track 214 is arranged on the longitudinal movement mechanism 22, making the movement process of the second nut pair 221 smoother.

[0034] The longitudinal movement mechanism 22 includes a second support 227, and the second nut pair 221 and the second slider 222 are both located at the bottom of the second support 227; A third lead screw 226 is arranged on the second support 227, and the third lead screw 226 is connected to a third motor 224; As Figure 10As shown, a third nut pair 231 is provided on the welding tongs mechanism 23 and is engaged with the third lead screw 226. The third motor 224 drives the third lead screw 226 to rotate, thereby driving the third nut pair 231 to move and driving the welding torch provided thereon to move up and down. By calculating the number of turns of the third motor 224, the up and down position of the welding torch can be obtained.

[0035] A third track 223 parallel to the third lead screw 226 is further provided on the second support 227, and a third slider 232 engaged with the third track 223 is provided on the welding tongs mechanism 23, making the movement process of the third nut pair 231 smoother.

[0036] As Figure 11 and Figure 12 shown, the welding tongs mechanism 23 includes a third support 237, and the third nut pair 231 and the third slider 232 are located on the side wall of the third support 237; A bracket 238 is provided on the third support 237, and the bracket 238 is connected to the welding tongs through a pin shaft 251 to support the welding tongs.

[0037] The welding tongs include a first welding tong 234 and a second welding tong 235; The welding tongs mechanism 23 further includes a cylinder 236 for controlling the opening and closing of the first welding tong 234 and the second welding tong 235. An air inlet hole 255 and an exhaust hole 256 are provided on the cylinder 236. A first pneumatic rod 253 is provided on the side wall of the first welding tong 234, and a second pneumatic rod 254 is provided on the side wall of the second welding tong 235. Both the first pneumatic rod 253 and the second pneumatic rod 254 are connected to a support block 252, and the support block 252 is in communication with the cylinder 236.

[0038] When the cylinder 236 intakes air, the first pneumatic rod 253 and the second pneumatic rod 254 are inflated and propped up, respectively driving the first welding tong 234 and the second welding tong 235 to move away from each other to open, facilitating the movement of the front floor or the welding tongs. After the cylinder 236 deflates, the first pneumatic rod 253 and the second pneumatic rod 254 retract, respectively driving the first welding tong 234 and the second welding tong 235 to approach each other until they close to weld the front floor.

[0039] The opening and closing of the air inlet hole 255 and the exhaust hole 256 on the cylinder 236 are both controlled by an electromagnetic valve, realizing the automation of the welding process.

[0040] A first water inlet and outlet hole 258 for cooling is provided on the side wall of the first welding tong 234, and a second water inlet and outlet hole 259 for cooling is provided on the side wall of the second welding tong 235. During long-term operation, the welding tongs are cooled through the water inlet and outlet holes to avoid damage to the equipment caused by long-term high temperature and affect normal production.

[0041] As Figure 6 、 Figure 8 andFigure 10 As shown, a guide rod 225 is provided on the second support 227, and a buffer sleeve 233 that cooperates with the guide rod 225 is provided on the side wall of the third support 237; the buffer sleeve 233 is sleeved outside the guide rod 225 and can move up and down along the guide rod 225.

[0042] A spring 24 is provided outside the guide rod 225, and the two ends of the spring 24 are respectively connected to the buffer sleeve 233 and the second support 227.

[0043] Through the setting of the spring 24, the weight of the welding tong mechanism 23 and its components is no longer transmitted to the third lead screw 226 and the third motor 224 through the third nut pair 231, but is borne by the spring 24, avoiding possible damage to the third motor 224 when the equipment is used or placed for a long time (in the prior art, in order to reduce damage to the motor, a brake motor needs to be used or a brake is provided outside the motor). Moreover, using the spring 24 also has a certain energy-saving effect. In the case of not using the spring 24: when moving upward, the third motor 224 needs to do work to overcome "the self-gravity of the welding tong mechanism 23 plus the upward movement resistance", and when moving downward, the third motor 224 needs to do work to overcome "the self-gravity of the welding tong mechanism 23 minus the downward movement resistance"; in the case of using the spring 24, the self-gravity of the welding tong mechanism 23 can be balanced by the spring 24, reducing the work done by the motor and achieving the energy-saving effect.

[0044] When this embodiment is in use, first input the positions of each welding point on the front floor, the welding sequence of each welding point, the angle that the rotary fixture 100 needs to rotate each time, and the distance that the welding torch 200 needs to move each time into the control system. Then, load the front floor into the rotary fixture 100 and fix it tightly through the eccentric pin 155. After that, the control system controls the opening and closing of the first welding tong 234 and the second welding tong 235 and the moving distance each time according to the built-in program to realize the automatic welding of all welding points.

[0045] This embodiment does not make any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all belong to the protection scope of the technical solution of the present invention.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the protection content of the present invention.

[0047] If terms such as "first" and "second" are used in this text to limit components, those skilled in the art should be aware that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description. Without additional declaration, these terms have no special meaning.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding tooling applicable to the front floor of an automobile, characterized in that: It includes a movable welding torch and a rotary fixture for fixing the front floor; The movable welding torch includes a transverse movement mechanism, on which a longitudinal movement mechanism is arranged, and on the longitudinal movement mechanism, a welding tongs mechanism is arranged; The rotary fixture includes a first base, on which a slewing bearing is rotatably arranged, on the slewing bearing, a support block is arranged, and on the top of the support block, a protrusion matching the opening of the front floor is arranged.

2. The welding tooling applicable to the front floor of an automobile according to claim 1, wherein A first motor for driving the slewing bearing to rotate is arranged on the first base; A connecting arm is arranged on the slewing bearing, and the support block is located at the end of the connecting arm.

3. The welding tooling applicable to the front floor of an automobile according to claim 2, characterized in that A round hole is penetrated in the support block, a rotating shaft is arranged in the round hole, and an eccentric pin for pressing the front floor is arranged on the top of the rotating shaft; The height that the protrusion protrudes from the upper end surface of the support block is the same as the thickness of the front floor.

4. The welding tooling applicable to the front floor of an automobile according to claim 3, characterized in that, A telescopic arm is arranged on the connecting arm, one end of the telescopic arm is connected to the connecting arm, and the other end of the telescopic arm is connected to the rotating shaft through a steering rod; The telescopic arm drives the rotating shaft to rotate in the round hole by telescoping.

5. A welding tooling applicable to the front floor of an automobile according to claim 1, characterized in that The transverse movement mechanism includes a second base, in which a second lead screw is arranged, and the second lead screw is connected to a second motor; A second nut pair matching the second lead screw is arranged on the longitudinal movement mechanism.

6. A welding tooling applicable to the front floor of an automobile according to claim 5, characterized in that, The longitudinal movement mechanism includes a second support, and the second nut pair is located at the bottom of the second support; A third lead screw is arranged on the second support, and the third lead screw is connected to a third motor; A third nut pair matching the third lead screw is arranged on the welding tongs mechanism.

7. The welding tooling applicable to the front floor of an automobile according to claim 6, characterized in that, The welding tongs mechanism includes a third support, and the third nut pair is located on the side wall of the third support; A bracket is arranged on the third support, and the bracket is connected to the welding tongs through a pin shaft.

8. A welding tooling applicable to the front floor of an automobile according to claim 7, characterized in that, The welding tongs include a first welding tong and a second welding tong; The welding tongs mechanism further includes a cylinder for controlling the opening and closing of the first welding tong and the second welding tong. An air inlet hole and an air outlet hole are arranged on the cylinder. A first pneumatic rod is arranged on the side wall of the first welding tong, and a second pneumatic rod is arranged on the side wall of the second welding tong. Both the first pneumatic rod and the second pneumatic rod are connected to the support block, and the support block is communicated with the cylinder.

9. A welding tooling applicable to the front floor of an automobile according to claim 8, characterized in that, A first water inlet and outlet hole for cooling is arranged on the side wall of the first welding tong, and a second water inlet and outlet hole for cooling is arranged on the side wall of the second welding tong.

10. A welding tooling applicable to the front floor of an automobile according to claim 7, characterized in that, A guide rod is arranged on the second support, and a buffer sleeve matching the guide rod is arranged on the side wall of the third support; A spring is arranged outside the guide rod, and the two ends of the spring are respectively connected to the buffer sleeve and the second support.

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