Electric vehicle frame welding robot

Abstract

The application relates to the technical field of welding, and discloses an electric vehicle frame welding manipulator, which comprises a welding mechanism, the side of the welding mechanism is provided with a first conveying line for conveying workpieces, a positioning mechanism is arranged on the first conveying line and used for positioning the workpieces during welding, the positioning mechanism comprises a shell movably arranged on the first conveying line, the shell is provided with two groups, a plurality of positioning heads for abutting and positioning the workpieces are arranged in the shell, the positioning heads are used for self-adaptive positioning of the workpieces, a tooth groove is formed in the positioning head, a locking mechanism is arranged on the shell, the locking mechanism comprises a positioning sheet fixed to the shell, and a second hydraulic rod is arranged on the outer wall of the positioning sheet. The plurality of positioning heads arranged on the shell are used for self-adaptive positioning of workpieces with different profiles, so that the stability during the welding process of the welding mechanism is ensured, and the welding quality is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding robot for electric vehicle frames. Background Technology

[0002] The frame of an electric vehicle is the core load-bearing component. Its welding quality directly affects the structural strength of the frame and the safety and durability of the entire vehicle. With the implementation of the new national standard for electric bicycles, the industry has put forward higher requirements for the strength, precision and lightweight of the frame, and the frame manufacturing process is upgrading towards high precision, high efficiency and high quality.

[0003] During the welding process of electric vehicle frames, the frames are bent and not flat. Existing welding positioning equipment cannot accurately adapt to the shape of the frame, which affects the subsequent welding process.

[0004] In response to the existing problems, there is an urgent need to innovate on the existing basis. Summary of the Invention

[0005] The purpose of this invention is to provide a welding robot for electric vehicle frames, in order to solve the problem mentioned in the background art that, during the welding process of electric vehicle frames, because the frames are bent and not flat, existing welding positioning equipment cannot effectively perform adaptive positioning according to the shape of the frames, which in turn affects the subsequent welding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electric vehicle frame welding robot, comprising a welding mechanism, wherein a first conveyor line for conveying workpieces is installed on the side of the welding mechanism, and a positioning mechanism is provided on the first conveyor line for positioning the workpiece during welding. The positioning mechanism includes a housing movably disposed on the first conveyor line, the housing being provided with two sets, and a plurality of positioning heads for contacting and positioning the workpiece are provided inside the housing to achieve adaptive positioning of the workpiece. The positioning heads are provided with toothed grooves, and a locking mechanism is provided on the housing. The locking mechanism includes a positioning piece fixed to the housing, and a second hydraulic rod is installed on the outer wall of the positioning piece. The output end of the second hydraulic rod is provided with a card that contacts the toothed groove to lock the position of the positioning head.

[0007] As an optional solution for the electric vehicle frame welding robot of the present invention, the housing is provided with a sliding groove and a storage cavity, and a sealing mechanism is provided between the sliding groove and the storage cavity to allow them to communicate. The sealing mechanism includes a connecting groove opened in the housing so that the liquid medium in the sliding groove can enter the storage cavity through the connecting groove. The housing is provided with a connecting pipe communicating with the storage cavity.

[0008] As an optional solution for the electric vehicle frame welding robot of the present invention, a sealing block is slidably arranged in the slide groove, the sealing block is fixedly connected to the positioning head, and the positioning head is arranged in a one-to-one correspondence with the slide groove.

[0009] As an optional solution for the electric vehicle frame welding robot of the present invention, the sealing mechanism further includes a sealing block disposed in the connecting groove, one end of the sealing block is connected to a spring, and the other end is provided with a positioning seat to achieve unidirectional sealing of the connecting groove.

[0010] As an optional solution for the electric vehicle frame welding robot of the present invention, the sealing mechanism further includes a limiting groove formed in the housing, a limiting rod slidably disposed in the limiting groove, the limiting rod passing through the sealing block and fixed to the positioning seat, so as to limit the sliding of the sealing block.

[0011] As an optional embodiment of the electric vehicle frame welding robot of the present invention, a movable plate is fixed on one side of the positioning seat, a third hydraulic rod is installed on the outside of the housing, the output end of the third hydraulic rod extends into the storage cavity and is fixed to the movable plate, so as to drive the movable plate to move the positioning seat along the connecting groove, thereby changing the pre-compression of the spring.

[0012] As an optional solution for the electric vehicle frame welding robot of the present invention, the positioning mechanism further includes a support frame fixed to the bottom of the housing, a slide block is provided at the end of the support frame, a movable seat is provided on the side of the slide block, and a first hydraulic rod for driving the slide block to slide is fixed on the movable seat. The first hydraulic rod is used to drive the slide block to move along the slide rail.

[0013] As an optional solution for the electric vehicle frame welding robot of the present invention, the movable seat is symmetrically provided with slide rails, and the slide rails are slidably connected to the slide block to make the slide block slide stably.

[0014] As an optional solution for the electric vehicle frame welding robot of the present invention, the positioning mechanism further includes a mounting base fixed to the outside of the first conveyor line. The mounting base is rotatably connected to the movable seat. The mounting base is provided with a drive motor for driving the movable seat to rotate relative to the mounting base.

[0015] As an optional solution of the electric vehicle frame welding robot of the present invention, a second conveyor line for conveying the welding parts is provided on the side of the first conveyor line, and a clamping mechanism is provided on one side of the second conveyor line to realize the welding parts being clamped onto the welding position on the first conveyor line.

[0016] The present invention has the following beneficial effects:

[0017] 1. This electric vehicle frame welding robot uses several positioning heads on its housing to achieve adaptive positioning of workpieces with different shapes, thereby ensuring the stability of the welding mechanism during the welding process and improving the welding quality.

[0018] 2. The electric vehicle frame welding robot uses a blocking block to provide a resistance force to the positioning head. Only when the positioning head contacts the workpiece and the pressure exceeds the resistance force will the positioning head be triggered to retract, thus avoiding abnormal retraction caused by movement and ensuring the normal positioning of the positioning mechanism.

[0019] 3. The electric vehicle frame welding robot uses a third hydraulic rod to adjust the position of the positioning seat, thereby adjusting the appropriate resistance force according to the workpiece size, and thus improving the adaptive positioning of the workpiece by the positioning mechanism. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the first conveyor line structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the positioning mechanism of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection structure between the first hydraulic rod and the support frame of the present invention.

[0024] Figure 5 This is a schematic diagram of the housing structure of the present invention.

[0025] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.

[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the housing of the present invention.

[0027] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B.

[0028] Figure 9 This is a schematic diagram of the connection structure between the third hydraulic rod and the movable plate of the present invention.

[0029] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point C.

[0030] In the diagram: 1. First conveyor line; 2. Second conveyor line; 3. Welding mechanism; 4. Clamping mechanism; 5. Positioning mechanism; 501. Mounting base; 502. Movable base; 503. Drive motor; 504. Slide rail; 505. Slide seat; 506. First hydraulic rod; 507. Support frame; 508. Housing; 509. Positioning head; 510. Tooth groove; 511. Sealing block; 512. Slide groove; 513. Storage cavity; 514. Connecting pipe; 6. Locking mechanism; 601. Positioning piece; 602. Second hydraulic rod; 603. Card; 7. Sealing mechanism; 701. Connecting groove; 702. Sealing block; 703. Spring; 704. Positioning base; 705. Limiting rod; 706. Limiting groove; 707. Movable plate; 708. Third hydraulic rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, please refer to Figures 1 to 10 A welding robot for electric vehicle frames includes a welding mechanism 3. A first conveyor line 1 for conveying workpieces is installed on the side of the welding mechanism 3. A positioning mechanism 5 is provided on the first conveyor line 1 for positioning the workpiece during welding. The positioning mechanism 5 includes a housing 508 movably disposed on the first conveyor line 1. The housing 508 is provided with two sets of positioning heads 509 that abut against the workpiece for self-adaptive positioning. The positioning heads 509 are provided with toothed grooves 510. A locking mechanism 6 is provided on the housing 508. The locking mechanism 6 includes a positioning piece 601 fixed on the housing 508. A second hydraulic rod 602 is installed on the outer wall of the positioning piece 601. The output end of the second hydraulic rod 602 is provided with a card 603 that abuts against the toothed grooves 510 to lock the position of the positioning heads 509.

[0033] The workpiece is transported using the first conveyor line 1. During the welding process, in order to ensure welding accuracy, the workpiece needs to be positioned to avoid misalignment after the workpiece and the welded part are joined, which would affect the welding quality. Existing frames mostly use one-piece die-cast load-bearing components, and the two load-bearing components are welded into a whole through connecting parts. The workpiece is the load-bearing component, and the connecting part is the welded part. Because the workpiece is one-piece die-cast, there are bent arc surfaces.

[0034] This application utilizes multiple positioning heads 509 provided on the housing 508. When the workpiece is conveyed to the welding position, the housing 508 is controlled to move on the first conveyor line 1. There are two housings 508, and the two sets of housings 508 move towards each other. As the housing 508 moves, the positioning heads 509 will gradually come into contact with the workpiece. Since the positioning heads 509 can slide inside the housing 508, the positioning head 509 that first contacts the workpiece will gradually retract into the housing 508, and eventually all positioning heads 509 will come into contact with the workpiece. This avoids the situation where some positioning heads 509 cannot make good contact with the workpiece due to the curved surface of the workpiece, which would affect the positioning effect of the workpiece.

[0035] Subsequently, the second hydraulic rod 602 on the positioning plate 601 is moved by controlling the movement. The output end of the second hydraulic rod 602 is connected to the card 603. The positioning head 509 is provided with a toothed groove 510. As the card 603 moves, the card 603 will eventually contact the toothed groove 510 and lock the housing 508, thus achieving stable positioning of the workpiece and avoiding workpiece movement during subsequent welding, which would affect the welding quality. By using multiple positioning heads 509 to position the workpiece, it is possible to position workpieces with irregular surfaces very well. It also has a good adaptive positioning effect for workpieces of different sizes. When positioning workpieces of different sizes, there is no need to change the positioning equipment.

[0036] The housing 508 has a sliding groove 512 and a storage cavity 513. A sealing mechanism 7 is provided between the sliding groove 512 and the storage cavity 513 to connect the two. The sealing mechanism 7 includes a connecting groove 701 opened in the housing 508 so that the liquid medium in the sliding groove 512 can enter the storage cavity 513 through the connecting groove 701. A connecting pipe 514 communicating with the storage cavity 513 is provided on the housing 508. A sealing block 511 is slidably arranged in the sliding groove 512. The sealing block 511 is fixedly connected to the positioning head 509. The positioning head 509 is arranged in a one-to-one correspondence with the sliding groove 512.

[0037] The housing 508 has a sliding groove 512 and a storage cavity 513. When the positioning head 509 slides in the housing 508, it will simultaneously drive the sealing block 511 located in the sliding groove 512 to slide. The positioning head 509 is prism in shape to ensure that there is no deflection when the positioning head 509 moves forward and backward, thereby ensuring that the tooth groove 510 always faces upward. With the movement of the positioning head 509 and the sealing block 511, the liquid medium inside the sliding groove 512 will be squeezed and allowed to enter the storage cavity 513 through the connecting groove 701, and finally discharged from the connecting pipe 514 to ensure the normal forward and backward movement of the positioning head 509.

[0038] A second conveyor line 2 for conveying welded parts is provided on the side of the first conveyor line 1. A clamping mechanism 4 is provided on one side of the second conveyor line 2 to clamp the welded parts onto the welding position on the first conveyor line 1. The first conveyor line 1 and the second conveyor line 2 are used to convey the workpiece and the welded parts. The clamping mechanism 4 is used to clamp the welded parts on the second conveyor line 2 onto the workpiece positioned by the positioning mechanism 5. The welding mechanism 3 is used to weld the workpiece and the welded parts. The first conveyor line 1, the second conveyor line 2, the welding mechanism 3 and the clamping mechanism 4 are all existing technologies. Those skilled in the art can select specific sizes and models according to actual needs.

[0039] Example 2 is an improvement upon Example 1, enhancing the accuracy of the workpiece positioning process. For details, please refer to [link / reference]. Figures 1 to 10 The sealing mechanism 7 further includes a sealing block 702 disposed in the communicating groove 701. One end of a spring 703 is connected to the outer wall of the sealing block 702, and a positioning seat 704 is disposed at the other end to achieve one-way sealing of the communicating groove 701. The sealing mechanism 7 also includes a limiting groove 706 opened in the housing 508. A limiting rod 705 is slidably disposed in the limiting groove 706. The limiting rod 705 passes through the sealing block 702 and is fixed to the positioning seat 704 to limit the sliding of the sealing block 702.

[0040] To ensure that the positioning head 509 only retracts when it contacts the workpiece, and to avoid abnormal situations caused by shaking during movement, a sealing block 702 is provided in the connecting groove 701. The sealing block 702 initially seals the connecting channel 701 between the slide groove 512 and the storage cavity 513, preventing abnormal retraction of the housing 508 when it approaches the workpiece without contact. When the positioning head 509 is contacted by the workpiece, the sealing block 511 slides within the slide groove 512, compressing the liquid medium inside the slide groove 512 and increasing the pressure of the liquid medium inside the slide groove 512. This pressure acts as... The sealing block 702 is used to overcome the elastic force of the spring 703 and move along the limiting rod 705, thereby opening the connecting groove 701. The outer diameter of the sealing block 702 at its maximum point is smaller than that of the connecting groove 701. As the sealing block 702 moves, it will open the connecting groove 701, release the blockage of the connecting groove 701, and allow the liquid medium in the slide 512 to smoothly enter the storage cavity 513. Because of the setting of the sealing block 702 and the spring 703, the positioning head 509 needs to be subjected to a certain resistance pressure to retract, which effectively avoids the situation where the positioning head 509 retracts abnormally due to shaking, affecting subsequent positioning. The liquid medium is hydraulic oil.

[0041] To ensure the stability of the sealing block 702 during sliding, a limiting rod 705 is fixed on the positioning seat 704. The limiting rod 705 slides inside the limiting groove 706. When the sealing block 702 slides, it will slide on the limiting rod 705. The limiting rod 705 is used to limit the sliding of the sealing block 702 and prevent the sealing block 702 from deflecting.

[0042] Example 3 is an improvement on Example 2, designed to adjust the contact pressure according to the workpiece size. For details, please refer to [link / reference]. Figures 1 to 10 A movable plate 707 is fixed on one side of the positioning seat 704. A third hydraulic rod 708 is installed on the outside of the housing 508. The output end of the third hydraulic rod 708 extends into the storage cavity 513 and is fixed to the movable plate 707 to drive the movable plate 707 to move the positioning seat 704 along the connecting groove 701, thereby changing the pre-compression amount of the spring 703.

[0043] To prevent abnormal retraction of the positioning head 509, a blocking block 702 and a spring 703 are used to set a resistance force for the retraction of the positioning head 509. When the positioning head 509 contacts the workpiece and exceeds the resistance force, the positioning head 509 will retract. When the workpiece size is smaller, the resistance force is larger, which can easily cause the workpiece to shift. If the resistance force is smaller, abnormal retraction can easily occur due to the movement of the housing 508.

[0044] With the third hydraulic rod 708 in place, when the workpiece size decreases, controlling the movement of the third hydraulic rod 708 causes the movable plate 707 to slide within the storage cavity 513. A positioning seat 704 is fixed on the movable plate 707, which in turn moves the positioning seat 704 within the connecting groove 701. This increases the distance between the sealing block 702 and the spring 703, thus changing the contact pressure of the spring 703 on the sealing block 702. This allows the positioning head 509 to retract despite a smaller contact force, preventing contact between the positioning head 509 and the workpiece. When workpiece misalignment occurs, if the workpiece size is large, the positioning seat 704 moves closer to the blocking block 702, the pre-compression of the spring 703 increases, and the pressure required to open the blocking block 702 increases to increase the resistance force. When the resistance force is large, the movement speed of the housing 508 can be increased, thereby improving the positioning efficiency. When the workpiece size becomes small, the positioning seat 704 moves away from the blocking block 702, the pre-compression of the spring 703 decreases, the pressure required to open the blocking block 702 decreases, and the movement speed of the housing 508 is reduced to ensure normal positioning of the workpiece.

[0045] When the distance between the blocking block 702 and the positioning seat 704 is at its maximum, the movable plate 707 continues to move to release the blocking effect of the blocking block 702 on the connecting groove 701. At this time, the hydraulic medium is pumped into the storage cavity 513 through the connecting pipe 514 by the hydraulic pump and flows into the slide groove 512 to abut against the sealing block 511, so that the sealing block 511 drives the positioning head 509 to reset. It should be noted that when the positioning seat 704 moves to the maximum position, the limiting rod 705 is still located in the limiting groove 706. The connecting pipe 514 is connected to the external receiving cavity to ensure that the liquid medium in the storage cavity 513 can enter the external receiving cavity. A hydraulic pump is provided between the connecting pipe 514 and the external receiving cavity to ensure that the liquid medium in the external receiving cavity is pumped into the storage cavity 513 in the future.

[0046] Example 4 is an improvement upon Example 1, designed to correct the workpiece. For details, please refer to [link / reference]. Figures 1 to 10 The positioning mechanism 5 further includes a support frame 507 fixed to the bottom of the housing 508. A slide block 505 is provided at the end of the support frame 507. A movable seat 502 is provided on the side of the slide block 505. A first hydraulic rod 506 for driving the slide block 505 to slide is fixed on the movable seat 502. The first hydraulic rod 506 is used to drive the slide block 505 to move along the slide rail 504. The slide rail 504 is symmetrically arranged on the movable seat 502. The slide rail 504 is slidably connected to the slide block 505 so that the slide block 505 can slide stably.

[0047] By controlling the first hydraulic rod 506 on the movable seat 502 to move in opposite directions, the slide 505 is driven to move the housing 508 on the support frame 507, thereby changing the position of the housing 508. When the card 603 locks the tooth groove 510, the position of the workpiece needs to be adjusted. The first hydraulic rod 506 is controlled to move in the same direction to adjust the position of the workpiece. In order to ensure smooth movement, a slide rail 504 is provided on the movable seat 502. The slide 505 slides on the movable seat 502. The slide rail 504 makes its movement more stable.

[0048] The positioning mechanism 5 also includes a mounting base 501 fixed to the outside of the first conveyor line 1. The mounting base 501 is rotatably connected to the movable seat 502. The mounting base 501 is provided with a drive motor 503 for driving the movable seat 502 to rotate relative to the mounting base 501.

[0049] When the workpiece angle needs to be adjusted, the drive motor 503 is controlled to rotate. The drive shaft of the drive motor 503 is connected to the rotating shaft of the movable seat 502. The movable seat 502 is rotatably mounted on the mounting base 501. As the drive motor 503 moves, it drives the movable seat 502 to rotate on the mounting base 501, thereby driving the housing 508 to move, so as to realize the adjustment of the workpiece angle. It should be noted that the welding in this application is the butt welding of a workpiece and a weldment. That is, after the positioning mechanism 5 positions the workpiece, the clamping mechanism 4 clamps the weldment and places it on the workpiece, and then the welding mechanism 3 completes the welding operation.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A welding robot for electric vehicle frames, comprising a welding mechanism (3), wherein a first conveyor line (1) for conveying workpieces is mounted on the side of the welding mechanism (3), and a positioning mechanism (5) is provided on the first conveyor line (1) for positioning the workpiece during welding, characterized in that, The positioning mechanism (5) includes a housing (508) movably mounted on the first conveyor line (1). The housing (508) is provided with two sets of positioning heads (509) that abut against the workpiece for positioning, so as to achieve adaptive positioning of the workpiece. The positioning head (509) is provided with a toothed groove (510). The housing (508) is provided with a locking mechanism (6). The locking mechanism (6) includes a positioning piece (601) fixed on the housing (508). A second hydraulic rod (602) is installed on the outer wall of the positioning piece (601). The output end of the second hydraulic rod (602) is provided with a card (603) that abuts against the toothed groove (510) to lock the position of the positioning head (509).

2. The electric vehicle frame welding robot according to claim 1, characterized in that: The housing (508) is provided with a sliding groove (512) and a storage cavity (513). A sealing mechanism (7) is provided between the sliding groove (512) and the storage cavity (513) to allow them to communicate. The sealing mechanism (7) includes a connecting groove (701) opened in the housing (508) so that the liquid medium in the sliding groove (512) enters the storage cavity (513) through the connecting groove (701). A connecting pipe (514) communicating with the storage cavity (513) is provided on the housing (508).

3. The electric vehicle frame welding robot according to claim 2, characterized in that: A sealing block (511) is slidably disposed in the groove (512). The sealing block (511) is fixedly connected to the positioning head (509). The positioning head (509) and the groove (512) are arranged in a one-to-one correspondence.

4. The electric vehicle frame welding robot according to claim 2, characterized in that: The sealing mechanism (7) further includes a sealing block (702) disposed in the connecting groove (701). The outer wall of the sealing block (702) is connected to one end of a spring (703), and the other end is provided with a positioning seat (704) to achieve one-way sealing of the connecting groove (701).

5. The electric vehicle frame welding robot according to claim 4, characterized in that: The sealing mechanism (7) further includes a limiting groove (706) opened in the housing (508), and a limiting rod (705) is slidably arranged in the limiting groove (706). The limiting rod (705) passes through the sealing block (702) and is fixed with the positioning seat (704) to limit the sliding of the sealing block (702).

6. The electric vehicle frame welding robot according to claim 5, characterized in that: A movable plate (707) is fixed to one side of the positioning seat (704), and a third hydraulic rod (708) is installed on the outside of the housing (508). The output end of the third hydraulic rod (708) extends into the storage cavity (513) and is fixed to the movable plate (707) to drive the movable plate (707) to move the positioning seat (704) along the connecting groove (701), thereby changing the pre-compression of the spring (703).

7. The electric vehicle frame welding robot according to claim 1, characterized in that: The positioning mechanism (5) further includes a support frame (507) fixed to the bottom of the housing (508). The end of the support frame (507) is provided with a slide (505). The side of the slide (505) is provided with a movable seat (502). A first hydraulic rod (506) for driving the slide (505) to slide is fixed on the movable seat (502). The first hydraulic rod (506) is used to drive the slide (505) to move along the slide rail (504).

8. The electric vehicle frame welding robot according to claim 7, characterized in that: The movable seat (502) is symmetrically provided with slide rails (504), and the slide rails (504) are slidably connected to the slide block (505) so that the slide block (505) can slide stably.

9. The electric vehicle frame welding robot according to claim 8, characterized in that: The positioning mechanism (5) further includes a mounting base (501) fixed to the outside of the first conveyor line (1). The mounting base (501) is rotatably connected to the movable seat (502). The mounting base (501) is provided with a drive motor (503) for driving the movable seat (502) to rotate, so as to drive the movable seat (502) to rotate relative to the mounting base (501).

10. The electric vehicle frame welding robot according to claim 1, characterized in that: A second conveyor line (2) for conveying the welded parts is provided on the side of the first conveyor line (1), and a clamping mechanism (4) is provided on one side of the second conveyor line (2) to realize the welding parts being clamped onto the welding position on the first conveyor line (1).

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