A projection welding fixture for bottom cover and lower fork arm

Abstract

The present invention relates to a projection welding fixture for a bottom cover and a lower fork arm, and belongs to the technical field of welding fixtures. The present invention comprises a welding frame, a lower electrode, a U-shaped support, two support plates, two stoppers and an upper electrode. The lower electrode is movably mounted on the welding frame, the U-shaped support is mounted on the welding frame and is located above the lower electrode, the U-shaped support comprises two side plates and a vertical plate, and a U-shaped groove with an opening facing backward is formed between the vertical plate and the two side plates; the two support plates are elastically slidably mounted on the two side plates up and down, respectively, the two stoppers are elastically slidably mounted on the two side plates left and right, respectively, and are located above the support plates, a sliding inclined surface is provided in the stopper, and the two sliding inclined surfaces approach each other from back to front, the upper electrode is movably mounted on the welding frame up and down and is located above the U-shaped groove, and the two support plates are respectively connected to the two stoppers in a transmission manner. The present invention can realize quick disassembly and assembly, and can effectively improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of welding fixtures, and in particular to a projection welding fixture for a bottom cover and a lower fork arm. Background Art

[0002] Automobile shock absorbers are an important part of the automobile suspension system. Their main function is to absorb and reduce vibrations and impacts caused by uneven road surfaces, and to improve the vehicle's driving stability and ride comfort.

[0003] In the existing shock absorber industry, there are a variety of shock absorber structures. Among them, the shock absorber with a U-shaped fork arm is a new type of shock absorber that has appeared in recent years. The U-shaped fork arm is an important component of the shock absorber. The U-shaped fork arm generally includes a U-shaped bottom cover and a lower fork arm. In the process of producing the U-shaped fork arm, the lower fork arm is generally welded to the U-shaped bottom cover by projection welding. Projection welding is a resistance welding method that achieves efficient and precise welding by presetting convex points or pits on the workpiece and using these convex points or pits to concentrate current and pressure during the welding process. Projection welding is used in the fields of automobile manufacturing, aerospace, and home appliance manufacturing, and is particularly suitable for mass production and welding of complex structures.

[0004] For example, a shock absorber lifting ring projection welding device and a welding method disclosed in the patent with the authorization announcement number CN107931809B, the shock absorber lifting ring projection welding device disclosed in the patent includes a first clamping mechanism and a second clamping mechanism arranged on a projection welding machine; the first clamping mechanism includes an upper electrode block, an upper electrode top block arranged on the upper electrode block and a first hydraulic cylinder connected to the upper electrode top block; the second clamping mechanism includes a lower electrode block, a lower electrode top block arranged on the lower electrode block and a second hydraulic cylinder connected to the lower electrode top block, an insert is arranged at the upper end of the lower electrode top block, and a clamping block is arranged at the lower end of the lower electrode top block, and a first button for controlling the first hydraulic cylinder and a second button for controlling the second hydraulic cylinder are arranged on the projection welding machine.

[0005] The device uses two upper electrode blocks to clamp the lifting ring, uses two lower electrode blocks to clamp the piston rod, and then uses a projection welding machine to press the lifting ring onto the piston rod to complete projection welding. In the process of clamping and positioning the lifting ring, it is necessary to place the lifting ring first, place the lifting ring on the upper electrode block, and then press the first button to clamp the lifting ring. In the process of clamping and positioning the piston rod, it is necessary to hold the piston rod with one hand, place the piston rod on the lower electrode block, and then use the other hand to press the second button to clamp the piston rod. The operation has many steps and is troublesome. After the welding is completed, it is necessary to turn off the projection welding machine first, and then press the first button and the second button to release the lifting ring of the two upper electrode blocks and the piston rod of the two lower electrode blocks to take out the welded finished product. If the shape of the upper electrode block and the lower electrode block in the device is simply changed and used to perform projection welding on the U-shaped bottom cover and the lower fork arm, there are many steps required before welding and before taking out the finished product, which takes a long time. In the mass production process, the production efficiency is low. Summary of the invention

[0006] The present invention provides a projection welding fixture for a bottom cover and a lower fork arm, so as to solve the technical problem that when projection welding is performed on the bottom cover and the lower fork arm using the projection welding device in the prior art, many operation steps need to be performed before the welding starts and before the welded product is taken out, which is cumbersome to use and leads to low production efficiency in mass production.

[0007] In order to solve the above problems, the present invention provides a projection welding fixture for a bottom cover and a lower fork arm, which adopts the following technical solution:

[0008] A projection welding fixture for a bottom cover and a lower fork arm comprises a welding frame and further comprises:

[0009] The lower electrode is movably mounted on the welding frame and is used for the lower fork arm to support the lower fork arm;

[0010] The U-shaped support is installed on the welding frame and is located above the lower electrode, and includes two side plates opposite to each other on the left and right and a vertical plate connected between the front ends of the two side plates. The vertical plate and the two side plates form a U-shaped groove with an opening facing backwards. The U-shaped groove is opposite to the lower electrode in vertical direction and is used for placing the U-shaped bottom cover with an opening facing upwards.

[0011] Two support plates are spaced apart and symmetrically arranged on the left and right sides, and are elastically slidably mounted on the two side plates up and down, and the ends of the two support plates close to each other extend into the U-shaped groove to support the U-shaped bottom cover;

[0012] Two stoppers are symmetrically arranged on the left and right sides, respectively elastically slidably mounted on the two side plates and located above the support plate. The ends of the two stoppers close to each other can be inserted into the U-shaped groove and are both provided with a push inclined surface. The two push inclined surfaces approach each other from the back to the front. When the U-shaped bottom cover is pushed into the U-shaped groove from the back to the front, the two stoppers are pushed away from each other by the push inclined surfaces, so that they are adapted to be inserted between the stoppers and the vertical plates.

[0013] The upper electrode is movably mounted on the welding frame and is located above the U-shaped groove. The upper electrode is used to move downward to push the U-shaped bottom cover in the U-shaped groove to be pressed on the lower fork arm for projection welding;

[0014] The two support plates are respectively connected with the two stoppers in a transmission manner. When the support plates move downward, the two stoppers can be driven to move away from each other, so that the stoppers leave the U-shaped groove.

[0015] By adopting the above technical scheme, the lower fork arm can be positioned by being mounted on the lower electrode, and the U-shaped bottom cover can be pushed into the U-shaped groove from back to front, so that the U-shaped bottom cover passes over the two stops and is stuck between the stops and the vertical plate, and the U-shaped bottom cover can be clamped and positioned by placing the U-shaped bottom cover on the support plate. The clamping and positioning of the U-shaped bottom cover can be completed during the process of placing the U-shaped bottom cover, and the operation steps are simple and the installation efficiency is higher. During welding, the upper electrode moves downward, pushing the U-shaped bottom cover downward, so that the U-shaped bottom cover is pressed tightly on the lower fork arm mounted on the lower electrode, so that the U-shaped bottom cover and the lower fork arm are convexly welded together, and the U-shaped bottom cover is clamped by the vertical plate and the stopper during the downward movement, and the vertical plate and the stopper have a guiding effect on the U-shaped bottom cover, so that the downward movement process of the U-shaped bottom cover is more stable. During the welding process and for a period of time after the welding is completed, the U-shaped bottom cover is still clamped by the stopper and the vertical plate, so that the welding position of the U-shaped bottom cover is more accurate and the shape of the welded product is more stable.

[0016] When the U-shaped bottom cover moves downward, it drives the support plate downward, and the support plate drives the two stoppers away from each other, so that the stoppers leave the U-shaped groove and no longer have a stopping effect on the U-shaped base. In this way, after welding is completed, it is only necessary to control the lower electrode to move downward and disengage from the lower fork arm, and the welded finished product can be directly taken out of the U-shaped groove from the front to the back. Compared with the operation method of pressing the first button and the second button in the prior art, the operation steps before taking out the welded finished product are simpler and less time-consuming. The process of the stopper leaving the U-shaped groove and the process of the U-shaped bottom cover moving downward are carried out simultaneously, which further saves time and improves production efficiency. The welded finished product does not need to be completely moved to the bottom of the stopper before being taken out. In the mass production process, the processing time can be further shortened and efficiency can be improved.

[0017] Furthermore, the stopper includes a matching block located outside the U-shaped groove, the support plate is provided with a push vertical plate located outside the U-shaped groove, the side of the push vertical plate facing away from the side plate is provided with a push inclined surface inclined from top to bottom toward the side plate, and a first elastic member that can be extended and retracted in the left and right directions is provided between the stopper and the side plate, the first elastic member applies an elastic force toward the U-shaped groove to the stopper, so that the matching block is pressed against the push inclined surface.

[0018] By adopting the above technical solution, when the support plate is driven to move downward, the push vertical plate is also driven to move downward. The push vertical plate drives the matching block elastically pressed on the push inclined surface to move back to the side plate through the push inclined surface, thereby driving the two stoppers to move away from each other and making the stoppers leave the U-shaped groove. The stoppers and the support plate are connected through the matching blocks and the push vertical plate. The structure is simple and the assembly is convenient.

[0019] Furthermore, a locking structure is provided on the side plate, and the locking structure is located below the support plate. When the support plate moves downward, the locking structure can be triggered and locked.

[0020] By adopting the above technical solution, when the support plate moves downward to the bottom limit position, the locking structure locks the support plate on the side plate. At this time, the upper electrode moves upward and resets. The support plate will not move upward under the action of elastic force and cause the stopper to reset, nor will it drag the welded finished product upward and make the welded finished product unable to be removed.

[0021] Furthermore, a horizontally extending trigger rod is connected to the support plate, and the locking structure includes a locking rod, one end of which is rotatably mounted on the side plate around a horizontally extending rotation axis, and a torsion spring is connected between the locking rod and the side plate. During the downward movement of the support plate, the trigger rod is driven to move downward and pass over the locking rod, thereby being locked on the side plate by the locking rod.

[0022] By adopting the above technical solution, when the trigger rod moves downward, it drives the locking rod to rotate downward, and finally the trigger rod passes over the locking rod. The locking rod is blocked above the trigger rod, so that the support plate cannot move upward under the action of elasticity, thereby locking the support plate. The structure is simple and the assembly is convenient.

[0023] Furthermore, both side panels are equipped with moving parts that elastically slide along the left and right directions, and the two moving parts are symmetrically arranged on the left and right. The moving parts are located below the support plate and behind the stopper. One end of the moving part can extend into the U-shaped groove and is provided with a transverse pushing inclined surface. The two transverse pushing inclined surfaces move away from each other from back to front. The other end of the moving part is located outside the U-shaped groove, and one end of the locking rod is rotatably installed around a rotation axis extending left and right on a part of the moving part that is located outside the U-shaped groove. In the process of the U-shaped bottom cover being pushed backward from the U-shaped groove, the two moving parts can be pushed away from each other through the transverse pushing inclined surface, thereby driving the two locking rods to move away from each other and causing the trigger rod and the locking rod to disengage from each other.

[0024] By adopting the above technical scheme, in the process of taking out the welded finished product from the U-shaped groove from front to back, the welded finished product pushes the two moving parts through the horizontal pushing inclined surface, so that the two moving parts move away from each other. In the process of the two moving parts moving away from each other, the two locking rods also move away from each other, thereby disengaging from the trigger rod, and the trigger rod loses the stop of the locking rod, so that the support plate moves upward and resets under the elastic action. In the process of the support plate moving upward, the stopper is reset under the action of the first elastic member. In the process of taking out the welded finished product, the support plate and the stopper can be triggered to reset at the same time, and there is no need to adjust the support plate and the stopper separately to reset them. The reset speed is faster. After the support plate and the stopper are reset, the welding of the next set of products can be continued. The time interval between two weldings is short, which can further improve the production efficiency.

[0025] Furthermore, the side panel is connected with a mounting piece, which is located outside the U-shaped groove. One end of the movable piece is slid left and right and penetrates the side panel, and the other end is slid left and right and penetrates the mounting piece. The end of the mounting piece facing away from the side panel is connected with a baffle, which is located above the locking rod and is used to limit the locking rod from rotating upward.

[0026] By adopting the above technical solution, the baffle plate limits the locking rod from rotating upward, and the baffle plate can withstand the pressure of the stop rod, so that the pressure of the stop rod does not need to be concentrated on the torsion spring, which is beneficial to prolonging the service life of the torsion spring which is relatively difficult to replace.

[0027] Furthermore, a guide support is fixedly connected to the side plate, and the guide support is located at the outside of the U-shaped groove. The guide support is provided with a guide groove extending left and right. The stop member also includes a connecting plate, a stop block and a connecting rod. The connecting plate is arranged in a vertical plane and is inserted in the guide groove for sliding left and right. Two stop blocks are provided at intervals up and down. The two stop blocks are connected to the connecting plate and are located on the side of the connecting plate close to the U-shaped groove. The stop block is provided with the sliding inclined surface. The connecting rod extends in the left and right directions. The connecting rod is connected to the connecting plate and is located on the side of the connecting plate that is away from the U-shaped groove. The matching block is connected to an end of the connecting rod that is away from the connecting plate, and the first elastic member is connected between the connecting plate and the guide support.

[0028] Furthermore, the pushing vertical plate includes a pushing plate section and a straight plate section which are connected in sequence from top to bottom, the pushing plate section is provided with the pushing inclined surface on one side facing away from the side plate, and the straight plate section is provided with a vertical surface which is connected in sequence with the pushing inclined surface on one side facing away from the side plate.

[0029] The beneficial effect of the projection welding fixture for a bottom cover and a lower fork arm provided by the present invention is that the bottom cover and the lower fork arm can be quickly installed and positioned before welding, and the welded product can be quickly taken out after welding is completed, thereby realizing quick assembly and disassembly, effectively improving production efficiency and saving time cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0031] Figure 1 A schematic diagram of the three-dimensional structure of a projection welding fixture of a bottom cover and a lower fork arm provided by the present invention from a top view;

[0032] Figure 2 A schematic diagram of the three-dimensional structure of a projection welding fixture of a bottom cover and a lower fork arm provided by the present invention from a bottom-up perspective;

[0033] Figure 3 A front view of a projection welding fixture for a bottom cover and a lower fork arm provided by the present invention;

[0034] Figure 4 A left side view of a projection welding fixture for a bottom cover and a lower fork arm provided by the present invention;

[0035] Figure 5 A top view of a projection welding fixture for a bottom cover and a lower fork arm provided by the present invention;

[0036] Figure 6 The present invention provides a schematic structural diagram of a stopper in a projection welding fixture for a bottom cover and a lower fork arm.

[0037] Description of reference numerals:

[0038] 1. U-shaped chassis; 2. horizontal plate; 3. upper electrode; 4. U-shaped bottom cover; 5. U-shaped support; 501. vertical plate; 502. side plate; 503. support plate slide; 504. trigger rod slide; 6. mounting piece; 7. support plate; 701. main support section; 702. main guide section; 8. guide support; 801. guide groove; 9. top push vertical plate; 901. top push plate section; 902. straight plate section; 903. top push inclined surface; 904, vertical surface; 10, locking rod; 11, baffle; 12, lower fork arm; 13, moving part; 14, third elastic part; 15, pressure plate; 16, guide rod; 17, second elastic part; 18, connecting circular plate; 19, trigger rod; 20, first elastic part; 21, stopper; 211, stop block; 212, connecting plate; 213, connecting rod; 214, matching block; 215, push inclined surface; 216, through groove. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] The following is one embodiment of a projection welding fixture for a bottom cover and a lower fork arm provided by the present invention:

[0041] like Figure 1-Figure 6 As shown, a projection welding fixture for a bottom cover and a lower fork arm includes a welding frame, a lower electrode, a U-shaped support 5, a support plate 7, a push vertical plate 9, a stopper 21, an upper electrode 3, a moving part 13 and a locking structure.

[0042] like Figure 1 As shown, the welded frame includes a U-shaped base frame 1 with an opening facing upward and two horizontal plates 2 connected to the top of the U-shaped base frame 1 in a left-right symmetrical manner, with a spacer provided between the two horizontal plates 2.

[0043] The lower electrode is cylindrical and is used to fit the lower fork arm 12 which is cylindrical and hollow inside. The lower electrode is movably arranged at the bottom of the U-shaped base frame 1. A bottom lifting drive is arranged below the U-shaped base frame 1. The lower electrode is connected to the driving output end of the bottom lifting drive. The bottom lifting drive is used to drive the lower electrode to move up and down.

[0044] The U-shaped support 5 is installed on the welding frame and is located between the two horizontal plates 2. The U-shaped support 5 includes a side plate 502 and a vertical plate 501. The side plates 502 are provided with two pieces. The two side plates 502 are spaced apart and arranged symmetrically. The bottom ends of the two side plates 502 are respectively fixed to the two horizontal plates 2, and the vertical plate 501 is connected between the front ends of the two side plates 502. The vertical plate 501 and the two side plates 502 form a U-shaped groove with the opening facing backward, and the above-mentioned lower electrode is opposite to the U-shaped groove up and down.

[0045] like Figure 4 As shown, the two side plates 502 are provided with support plate slots 503 and trigger rod slots 504 extending in the up-down direction, and the support plate slots 503 and trigger rod slots 504 are arranged at intervals from front to back. The two side plates 502 are connected with a pressure plate 15, which is located outside the U-shaped slot and above the support plate slots 503. Figure 1 , Figure 3 As shown, the two side plates 502 are connected with guide supports 8, the two guide supports 8 are arranged symmetrically, the guide supports 8 are U-shaped and the opening faces the side plate 502 and is connected to the outer wall of the side plate 502, as shown in FIG. Figure 5As shown, the U-shaped inner cavity of the guide support 8 forms a guide groove 801. Both side plates 502 are connected with L-shaped mounting members 6, which are located outside the U-shaped groove and below the guide support 8 and at the rear side of the guide support 8.

[0046] like Figure 1 , Figure 2 As shown, there are two support plates 7, which are spaced from left to right and arranged symmetrically, and the two support plates 7 are respectively slidably mounted on the two side plates 502. The support plate 7 includes a main support section 701 and a main guide section 702, the main support section 701 is located in the U-shaped groove, and the main guide section 702 passes through the above-mentioned support plate slide 503 and extends to the outside of the U-shaped groove. The top of the main guide section 702 is vertically connected with a guide rod 16, and the guide rod 16 is slidably penetrated on the pressure plate 15. The top of the guide rod 16 is vertically connected with a connecting circular plate 18, and a second elastic member 17 is connected between the connecting circular plate 18 and the pressure plate 15, and the second elastic member 17 is sleeved on the outside of the guide rod 16, and the second elastic member 17 is a compression spring, and the second elastic member 17 applies an upward elastic force to the support plate 7 through the connecting circular plate 18. The main support section 701 is also connected with a trigger rod 19 extending in the left and right direction, and the trigger rod 19 passes through the trigger rod slide 504 and extends to the outside of the U-shaped groove.

[0047] like Figure 1 , Figure 2 As shown, two push vertical plates 9 are provided, and the two push vertical plates 9 are respectively connected to the tops of the two trigger rods 19. The push vertical plates 9 include a push plate section 901 and a straight plate section 902 which are connected in sequence from top to bottom, and a push inclined surface 903 which is inclined from top to bottom toward the side plate 502 is provided on the side of the push plate section 901 which is not facing the side plate 502, and a vertical surface 904 which is vertically extended and connected in sequence with the push inclined surface 903 is provided on the side of the straight plate section 902 which is not facing the side plate 502.

[0048] like Figure 1 , Figure 3 As shown, there are two stoppers 21, which are arranged symmetrically and slidably mounted on the two side plates 502. Figure 5 , Figure 6As shown, the stopper 21 includes a connecting plate 212, a stopper block 211, a connecting rod 213 and a matching block 214. The connecting plate 212 is inserted into the guide groove 801 on the guide support 8 in a sliding manner along the left-right direction. There are two stopper blocks 211, which are arranged at intervals up and down and are both connected to the side of the connecting plate 212 close to the U-shaped groove. The rear side of the stopper block 211 is provided with a push inclined surface 215, and the push inclined surfaces 215 on the two stopper members 21 approach each other from the back to the front. The connecting rod 213 extends along the left-right direction and is connected to the side of the connecting plate 212 that is away from the U-shaped groove. One end of the connecting rod 213 that is away from the connecting plate 212 passes through the guide support 8 and extends to the outside of the guide support 8. A through slot 216 is provided on the side of the connecting rod 213 away from the connecting plate 212, which penetrates from top to bottom and opens away from the connecting plate 212. A matching block 214 is connected to one end of the connecting rod 213 facing away from the connecting plate 212, and the matching block 214 blocks the open end of the through slot 216. A first elastic member 20 is connected between the connecting plate 212 and the guide support 8. The first elastic member 20 is a compression spring. The first elastic member 20 is sleeved on the connecting rod 213 and is used to apply an elastic force toward the U-shaped slot to the connecting rod 213.

[0049] like Figure 2 , Figure 3 , Figure 4 As shown, the above-mentioned pushing vertical plate 9 slides up and down in the through groove 216. During the downward movement of the pushing vertical plate 9, the pushing vertical plate 9 pushes the matching block 214 to move back toward the connecting plate 212 through the pushing inclined surface 903, thereby driving the stopping member 21 to move back toward the U-shaped groove, so that the stopping block 211 leaves the U-shaped groove.

[0050] The upper electrode 3 is located above the U-shaped groove, and a top lifting drive is provided above the welding frame. The upper electrode 3 is connected to the driving output end of the top lifting drive. The top lifting drive is used to drive the upper electrode 3 to move downward, so that the upper electrode 3 pushes the U-shaped bottom cover 4 to move downward, driving the U-shaped bottom cover 4 to be pressed against the lower fork arm 12 mounted on the lower electrode.

[0051] like Figure 1-Figure 5 As shown, two moving members 13 are provided, and the two moving members 13 are respectively slidably mounted on the two side plates 502, and one end of the moving member 13 close to the side plate 502 is slidably penetrated on the side plate 502, and one end away from the side plate 502 is slidably penetrated on the mounting member 6. The ends of the two moving members 13 close to each other can both extend into the U-shaped groove, and the ends of the two moving members 13 close to each other are both provided with a transverse push inclined surface, and the two transverse push inclined surfaces on the two moving members 13 are away from each other from the back to the front.

[0052] A third elastic member 14 is sleeved on the outer side of the moving member 13. The third elastic member 14 is connected between the moving member 13 and the mounting member 6. The third elastic member 14 is a compression spring. The third elastic member 14 applies an elastic force toward the U-shaped groove to the moving member 13 so that the end of the moving member 13 can extend into the U-shaped groove.

[0053] The locking structure includes a locking rod 10 and a torsion spring. Figure 1 , Figure 2 As shown, a locking rod 10 is provided at one end of the moving member 13 facing away from the side plate 502. The locking rod 10 extends in the front-to-back direction. One end of the locking rod 10 is rotatably mounted on the moving member 13 around a rotation axis extending left and right. A torsion spring is connected between the locking rod 10 and the moving member 13. A baffle 11 is connected to the top of one end of the mounting member 6 facing away from the side plate 502. The baffle 11 is arranged above the locking rod 10 to limit the locking rod 10 from rotating upward. The locking rod 10 is opposite to the end of the trigger rod 19 above. When the trigger rod 19 moves downward with the support plate 7, it can push the locking rod 10 to rotate downward. After the trigger rod 19 passes over the locking rod 10, it can be stopped by the locking rod 10 and locked on the side plate 502.

[0054] When the present invention is used, the lower fork arm 12 is first mounted on the lower electrode, and then the bottom lifting drive member drives the lower electrode to move upward, driving the lower fork arm 12 to move upward to the welding station. The U-shaped bottom cover 4 is placed on the support plate 7 with the opening facing upward, and the U-shaped bottom cover 4 is pushed forward to make the U-shaped bottom cover 4 pass over the stop blocks 211 on both sides and be stuck between the stop blocks 211 and the vertical plate 501, so as to realize the positioning of the U-shaped bottom cover 4. Then start the top lifting drive member, which drives the upper electrode 3 to move downward, and the upper electrode 3 pushes the U-shaped bottom cover 4 to move downward. The U-shaped bottom cover 4 moves until it contacts the lower fork arm 12, and the U-shaped bottom cover 4 and the lower fork arm 12 are projection welded together. During the projection welding process, the U-shaped bottom cover 4 still has a downward movement distance. Within this downward movement distance, the U-shaped bottom cover 4 is still in a state of being stuck in the stop block 211 and the vertical plate 501. The stop block 211 and the vertical plate 501 have a guiding effect on the U-shaped bottom cover 4, so that the position of the U-shaped bottom cover 4 during welding is more stable and the welding accuracy is higher.

[0055] During the downward movement of the U-shaped bottom cover 4, the support plate 7 is also driven to move downward. During the downward movement of the support plate 7, the matching block 214 is pushed by the push plate section 901 in the push vertical plate 9 and moves away from the side plate 502, so that the two stoppers 21 gradually move away from each other, and the stopper 211 gradually leaves the U-shaped groove. After the welding is completed, the bottom lifting drive member drives the lower fork arm 12 to move downward, driving the welded product as a whole to continue to move downward for a distance, and the lower fork arm 12 is stopped by the bottom of the U-shaped chassis 1. At this time, the stopper 211 completely leaves the U-shaped groove, and the stopper 211 no longer has a limiting effect on the U-shaped bottom cover 4. The trigger rod 19 is blocked by the locking rod 10 so that the support plate 7 is locked on the side plate 502, and then the bottom lifting drive member drives the lower electrode to move downward, so that the lower electrode is completely separated from the lower fork arm 12. After the lower electrode is separated from the lower fork arm 12, the lower fork arm 12 is held to pull the welded product backward. During the backward movement, the U-shaped bottom cover 4 pushes the two moving parts 13 away from each other, and the moving parts 13 drive the two locking rods 10 away from each other. The locking rod 10 moves to a position where it no longer corresponds to the trigger rod 19 up and down, and the trigger rod 19 is no longer blocked by the locking rod 10. The support plate 7 is reset under the action of the second elastic member 17, and the moving part 13 is reset under the action of the third elastic member 14. Then, the installation and welding of the next group of products can be continued.

[0056] The present invention can realize the rapid installation and positioning of the U-shaped bottom cover 4, and the finished welding product can be quickly taken out after welding is completed. While taking out the finished welding product, the support plate 7 and the stopper 21 used for positioning the U-shaped bottom cover 4 can be reset, thereby realizing rapid disassembly and assembly and effectively improving production efficiency.

[0057] In this embodiment, a baffle 11 is provided on the mounting member 6, and the baffle 11 limits the locking rod 10 from rotating upward. In other embodiments, the baffle 11 is not provided on the mounting member 6. At this time, the locking rod 10 is only limited to rotate upward by the torsion spring. It is necessary to select a torsion spring that can only be twisted in one direction and has a high structural strength.

[0058] In this embodiment, the locking structure includes a locking rod 10 and a torsion spring. In other embodiments, the locking structure includes a locking slider and a fourth elastic member. The locking slider is slidably assembled on the welding frame along the left and right directions. The locking slider is provided with a guiding inclined surface inclined from top to bottom toward the side plate 502. The fourth elastic member can be extended and retracted along the left and right directions and is connected between the locking slider and the welding frame. When the trigger rod 19 moves downward with the support plate 7, the locking slider is pushed to move back to the side plate 502 through the guiding inclined surface, and finally passes the locking slider and is stuck under the locking slider, thereby locking the support plate 7.

[0059] In this embodiment, the support plate 7 is transmission connected to the stop member 21 through the push vertical plate 9, so as to drive the two stop members 21 away from each other when the support plate 7 moves downward. In other embodiments, the support plate 7 is transmission connected to the stop member 21 through a gear rack structure. A vertically arranged first rack is connected to the support plate 7, and a second rack extending left and right is connected to the stop member 21. The first rack and the second rack are both meshed with the same gear. When the support plate 7 moves downward, the gear is driven to rotate by the first rack, and the gear drives the second rack to move away from the U-shaped groove, thereby driving the two stop members 21 away from each other.

Claims

1. A projection welding fixture for a bottom cover and a lower fork arm, comprising a welding frame, characterized in that: Also includes: The lower electrode is movably mounted on the welding frame and is used for the lower fork arm to support the lower fork arm; The U-shaped support is installed on the welding frame and is located above the lower electrode, including two side plates opposite to each other on the left and right and a vertical plate connected between the front ends of the two side plates, and a U-shaped groove with an opening facing backward is formed between the vertical plate and the two side plates, and the U-shaped groove is opposite to the lower electrode up and down, and is used for placing the U-shaped bottom cover with an opening facing upward; the two side plates are connected with guide supports, and the two guide supports are arranged symmetrically on the left and right, and the guide supports are U-shaped and connected to the outer side walls of the side plates with an opening facing the side plates, and the U-shaped inner cavity of the guide supports forms a guide groove; Two support plates are spaced apart and symmetrically arranged on the left and right sides, and are elastically slidably mounted on the two side plates up and down, and the ends of the two support plates close to each other extend into the U-shaped groove to support the U-shaped bottom cover; The two stops are arranged symmetrically on the left and right; the stoppers include a connecting plate, a stop block, a connecting rod and a matching block, the connecting plate is slidably inserted in the guide groove along the left and right directions, the stop blocks are arranged at intervals up and down and are both connected to one side of the connecting plate close to the U-shaped groove, a push inclined surface is provided on the rear side of the stop block, and the push inclined surfaces on the two stoppers approach each other from back to front, the connecting rod extends along the left and right directions and is connected to the side of the connecting plate facing away from the U-shaped groove, one end of the connecting rod facing away from the connecting plate passes through the guide support and extends to the outside of the guide support, a through groove is provided on the side of the connecting rod away from the connecting plate that penetrates up and down and has an opening facing away from the connecting plate, the matching block is connected to one end of the connecting rod facing away from the connecting plate, and a first elastic member is connected between the connecting plate and the guide support; in the process of the U-shaped bottom cover being pushed into the U-shaped groove from back to front, the two stops are pushed away from each other by the push inclined surface, so as to fit between the stopper and the vertical plate; The support plate is provided with a push plate located outside the U-shaped groove, the push plate includes a push plate section and a straight plate section connected in sequence from top to bottom, a push plate section is provided with a push inclined surface on one side facing away from the side plate, and a straight plate section is provided with a vertical surface connected in sequence with the push inclined surface on one side facing away from the side plate, and the push plate is slidably arranged in the through groove up and down; The upper electrode is movably mounted on the welding frame and is located above the U-shaped groove. The upper electrode is used to move downward to push the U-shaped bottom cover in the U-shaped groove to be pressed on the lower fork arm for projection welding; A locking structure is provided on the side plate, the locking structure is located below the support plate, and the locking structure includes a locking rod, and a torsion spring is connected between the locking rod and the side plate; a trigger rod extending horizontally is connected to the support plate, and the trigger rod is driven to move downward and pass over the locking rod during the downward movement of the support plate, so that it is locked on the side plate by the locking rod; The two side plates are both equipped with moving parts that slide elastically in the left and right directions. The two moving parts are symmetrically arranged left and right. The moving parts are located below the support plate and behind the stopper. One end of the moving part can extend into the U-shaped groove and is provided with a transverse pushing inclined surface. The two transverse pushing inclined surfaces move away from each other from back to front. The other end of the moving part is located outside the U-shaped groove. One end of the locking rod is rotatably installed around a rotation axis extending left and right on a part of the moving part that is located outside the U-shaped groove. In the process of the U-shaped bottom cover being pushed backward from the U-shaped groove, the two moving parts can be pushed away from each other through the transverse pushing inclined surface, thereby driving the two locking rods to move away from each other and causing the trigger rod and the locking rod to disengage from each other.

2. A projection welding fixture for bottom cover and lower fork arm according to claim 1, characterized in that: The side panel is connected with a mounting piece, which is located outside the U-shaped groove. One end of the movable piece is slidable left and right through the side panel, and the other end is slidable left and right through the mounting piece. The end of the mounting piece facing away from the side panel is connected with a baffle, which is located above the locking rod and is used to limit the locking rod from rotating upward.

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