Spot welding device for stop ring of piston rod of shock absorber

Abstract

The invention belongs to the technical field of shock absorber parts, and relates to a shock absorber piston rod stop ring spot welding device which comprises a cabinet body, a working disc, a stepping type driving mechanism, a positioning mechanism, a pressing mechanism, a multi-point welding mechanism and a detection mechanism, and the working disc, the stepping type driving mechanism, the positioning mechanism, the pressing mechanism, the multi-point welding mechanism and the detection mechanism are arranged in the cabinet body. The working disc is provided with a plurality of feeding stations which are evenly distributed in the circumferential direction, and each feeding station is provided with a positioning mechanism. The stepping driving mechanism is in transmission connection with the working disc and is used for driving the working disc to do stepping rotation; the pressing mechanism is arranged on the multi-point welding mechanism, and the detection mechanism comprises a pre-welding detection mechanism and a post-welding detection mechanism which are arranged on the front side and the rear side of the welding mechanism. The technical problems that in the prior art, an automatic spot welding check ring device for the shock absorber is low in welding efficiency, and the welding quality is not easy to guarantee can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of shock absorber parts, and particularly relates to a spot welding device for a shock absorber piston rod stop ring. Background Art

[0002] The main function of the stop ring on the shock absorber is to limit the stroke of the shock absorber. It is usually welded on the piston rod. The connection strength between the stop ring and the piston rod and the surface quality of the piston rod will directly affect the performance of the shock absorber.

[0003] In the prior art, a spot welding device is usually used to weld the stop ring on the shock absorber piston rod. The structure of the spot welding device is as shown in the automatic spot welding retaining ring device for shock absorbers disclosed in the Chinese utility model patent with the authorization publication number CN213105044U. It includes a horizontally arranged equipment connecting plate. A moving module is provided on the top of the floating bottom plate. The moving module includes an adjusting lead screw and a guide rod. A slider is provided on the moving module. The left end of the adjusting lead screw is provided with an adjusting handwheel. A rotary cylinder is provided on the slider. The rotary disk of the rotary cylinder is arranged to the left. A rotary cylinder connecting block is provided on the left side surface of the rotary disk of the rotary cylinder. A jaw cylinder is fixedly provided on the left side surface of the rotary cylinder connecting block. The jaws of the jaw cylinder are arranged to the left. A vertically upward arranged retaining ring positioning block is provided at the relative position on the left side of the top surface of the floating bottom plate. Upper electrodes are provided at the relative positions on the top of the retaining ring (i.e., the stop ring), and lower electrodes are provided at the relative positions on the bottom of the retaining ring. The upper electrode is arranged with a gap from the retaining ring, and the lower electrode is arranged with a gap from the retaining ring.

[0004] Before welding the above automatic spot welding retaining ring device for shock absorbers, it is necessary to manually pass the piston rod through the retaining ring and insert the retaining ring into the through hole of the retaining ring positioning block, and then manually rotate the adjusting first wheel to adjust the relative position between the guide rod and the piston rod to complete the positioning of the piston rod and the retaining ring. To ensure the welding quality, multi-point welding is required, and the piston rod and the retaining ring need to be flipped, so two welding operations are required. After welding, the jaw cylinder is loosened, and the piston rod and the retaining ring are manually taken out. Although the above automatic spot welding retaining ring device for shock absorbers can achieve reliable positioning of the piston rod and the retaining ring, there are too many manual operation steps, and one end of the retaining ring has no restraint, so it is not easy to ensure the accurate welding position of the stop ring on the piston rod during the welding process, and the welding quality is not easy to guarantee. It is necessary to manually detect the welding position of the retaining ring after welding. In addition, the welding device needs to wait until the piston rod and the stop ring after each welding are taken out and the newly placed piston rod and stop ring are repositioned before it can continue to operate, and the worker needs to frequently install and disassemble the piston rod and the retaining ring. At the same time, the welding operation needs to be carried out in two times, resulting in low welding efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a spot welding device for a piston rod retaining ring of a shock absorber, so as to solve the technical problems of low welding efficiency and difficulty in ensuring welding quality of the automatic spot welding retaining ring device for shock absorbers in the prior art.

[0006] In order to solve the above problems, the shock absorber piston rod retaining ring spot welding device provided by the present invention adopts the following technical solutions: A spot welding device for a piston rod and a retaining ring of a shock absorber comprises a cabinet and a working disk arranged in the cabinet, a stepping drive mechanism, a positioning mechanism, a clamping mechanism, a multi-point welding mechanism and a detection mechanism, wherein a loading port is provided on the cabinet: a plurality of loading stations evenly distributed in a circle are provided on the working disk, each loading station is provided with the positioning mechanism, and the positioning mechanism is used to position the piston rod and the retaining ring; the stepping drive mechanism is transmission-connected with the working disk, and is used to drive the working disk to rotate step by step, so that the loading stations are rotated to the welding mechanism one by one; the clamping mechanism is arranged at the welding mechanism, and is used to clamp the piston rod and the retaining ring on the loading station rotated to the multi-point welding mechanism; the multi-point welding mechanism is used to perform multi-point welding on the piston rod and the retaining ring after being positioned at the loading station; the detection mechanism comprises a visual detection mechanism and a post-weld detection mechanism arranged on the front and rear sides of the welding mechanism. Beneficial effects: The present invention integrates the loading, positioning and clamping, welding, and pre-welding and post-welding inspections of the piston rod and the retaining ring into one cabinet, with a compact overall structure, a high degree of automation, and high safety. A worktable with multiple loading stations is adopted, and combined with the intermittent drive of a stepping drive mechanism, parallel processing of multiple stations can be realized, thereby improving the continuous production capacity of the entire shock absorber piston rod retaining ring spot welding device. Manual labor only needs to load and take out materials, thereby reducing labor intensity. The multi-point welding mechanism can perform multi-point welding at one time, thereby improving welding efficiency. The inspection mechanism can perform inspections before and after welding, respectively, to ensure welding quality and reduce material waste.

[0007] Furthermore, the multi-spot welding mechanism includes a welding frame and four circumferentially evenly distributed welding units mounted on the welding frame, each welding unit includes a welding drive cylinder, a welding arm connected to the output end of the welding drive cylinder, and a spot welding electrode connected to the welding arm, and the spot welding electrode has a flat welding head.

[0008] Beneficial effects: It can achieve welding at four positions at one time without multiple welding operations; the spot welding electrode adopts a flat welding head, which can increase the welding contact area with the stop ring. The larger welding contact area makes the welding current distribution more uniform, reduces the current density per unit area, and the uniformization of the current density reduces the local overheating and erosion of the electrode, thereby slowing down the wear rate of the welding head. At the same time, the uniform current distribution reduces spatter and avoids the problem of spatter adhering to the surface of the spot welding electrode and accelerating wear; the flat welding head disperses the pressure on the stop ring to a larger contact area, making the contact with the stop ring more stable, reducing the grinding frequency in actual use, and making the welding quality more stable.

[0009] Further, the pressing mechanism includes a downward pressing mechanism and an upward pressing mechanism arranged oppositely. The downward pressing mechanism is assembled on the welding frame and is used to press the stop ring and the piston rod downward, and the upward pressing mechanism is used to press the piston rod positioning seat upward.

[0010] Beneficial effects: The downward pressing mechanism and the upward pressing mechanism are arranged separately, and can press the piston rod and the stop ring from the upper and lower directions respectively to ensure the firm positioning of the piston rod and the stop ring.

[0011] Further, the positioning mechanism includes a base, a stop ring positioning seat, a spring limiting mechanism, and a piston rod positioning seat; the base is provided with a lateral opening extending in the up and down direction, the stop ring positioning seat is arranged in the lateral opening, the stop ring positioning seat has a lateral opening and a stop positioning surface, the stop positioning surface is located above the lateral opening and is used for stop cooperation with the stop ring, the lateral opening communicates with the lateral opening up and down and the diameter of the lateral opening is not greater than the minimum diameter of the lateral opening, and is used for the piston rod to be inserted and taken out along its radial direction; the spring limiting mechanism includes two spring claws and a spring connected to the same end of the two spring claws. Each spring claw is rotatably assembled with the base. In the natural state of the spring, a guiding opening and a limiting opening are formed between the two spring claws. The limiting opening is vertically opposite to the lateral opening, and the piston rod is placed at the lateral opening and the limiting opening through the guiding opening; the piston rod positioning seat is provided with a piston rod positioning groove for the piston rod to be inserted, and the top of the piston rod positioning seat is used for stop cooperation with the step on the piston rod.

[0012] Beneficial effects: During use, the piston rod sleeved with the stop ring is clamped into the position of the limiting opening and the lateral opening through the lateral opening from one side of the guiding opening. The lower end of the piston rod is inserted into the piston rod positioning seat, and the step of the piston rod is in stop contact with the piston rod positioning seat, while the stop ring is positioned on the stop ring positioning seat through the stop positioning surface, realizing the rapid positioning of the piston rod and the stop ring and improving the positioning efficiency of the piston rod and the stop ring. When the welding is completed, just open the guiding opening, pull out the bottom end of the piston rod from the piston rod positioning seat, and the piston rod together with the stop ring can be quickly pulled out from the lateral opening. The whole positioning process and disassembly process are simple and fast, ensuring the welding efficiency.

[0013] Furthermore, the spring claw includes a main body part and a mounting part which are detachably connected, and a limiting port and a guiding port are formed between the two main body parts; the stop ring mounting seat is detachably connected to the base.

[0014] Beneficial effects: When the main body part is damaged, it can be disassembled and replaced from the mounting part without replacing the entire spring limiting mechanism; in addition, main body parts of different sizes can also be replaced to limit piston rods of different diameters, improving the versatility of the entire spot welding device.

[0015] Furthermore, the mounting height of the piston rod positioning seat is adjustable.

[0016] Beneficial effects: Since the piston rod positioning seat abuts against the step at the lower part of the piston rod, when the height of the piston rod positioning seat is adjusted, the abutting position between it and the step on the piston rod changes. Correspondingly, the length of the piston rod extending out of the stop ring positioning seat changes, and further, the welding position of the stop ring on the piston rod can be adjusted to ensure the unity of the welding positions of the stop rings at each loading station and the consistency of welding.

[0017] Furthermore, the step-by-step driving mechanism includes a dividing plate capable of performing intermittent indexing movement. The dividing plate is fixedly connected to the working plate through multiple columns. An adjusting plate is arranged in parallel between the dividing plate and the working plate and is in guiding sliding fit with each column. The piston rod positioning seat is arranged on the adjusting plate; a regulating shaft is coaxially rotatably assembled between the working plate and the dividing plate. The regulating shaft is in threaded connection with the adjusting plate; a power transmission part is connected to the top of the regulating shaft. A rotatable power part capable of lifting is arranged in the cabinet body, and the rotatable power part has a clutch part for engaging or disengaging with the power transmission part; a transmission mechanism is arranged between the part of the regulating shaft extending out of the working plate and the working plate. The transmission mechanism drives the regulating shaft to rotate when the power transmission part and the clutch part are engaged, so as to lift the adjusting plate.

[0018] Beneficial effects: The height of the piston rod positioning seat can be automatically adjusted, and the overall structure is compact without occupying too much space in the height of the cabinet body; the rotatable power part is driven as needed, which can reduce energy consumption; a lead screw-nut type transmission structure is adopted to realize precise adjustment of the height position of the intermediate plate.

[0019] Furthermore, the transmission mechanism is a bevel gear mechanism, including a first bevel gear, a second bevel gear, and a transmission shaft. The first bevel gear is coaxially fixed on the regulating shaft, the second bevel gear is coaxially fixed on the transmission shaft, and the transmission shaft is rotatably assembled on the working plate through a support seat.

[0020] Further, the pre-welding detection mechanism includes a length detection mechanism and a direction detection mechanism. The length detection mechanism includes a first detection cylinder located inside the cabinet and a first pressing member connected to the output end of the first detection cylinder. The first pressing member is used to press down the piston rod. A first displacement sensor is installed inside the first detection cylinder to detect the moving stroke of the first pressing member. The direction detection mechanism includes a vision detection camera.

[0021] Further, the post-welding detection mechanism includes a lifting cylinder, a second detection cylinder, and a second pressing member. The output end of the lifting cylinder is used to lift the piston rod positioning seat so that the piston rod positioning seat is maintained at a set height. The second detection cylinder is used to drive the second pressing member to move up and down. A second displacement sensor for detecting the moving stroke of the second pressing member is installed inside the second detection cylinder. A detection hole adapted to the top of the piston rod is provided on the second pressing member.

[0022] The beneficial effects of the present invention are as follows: 1. In the present invention, the feeding, positioning and pressing, welding, pre-welding and post-welding detection of the piston rod and the stop ring are integrated in one cabinet. The overall structure is compact, the degree of automation is high, and the safety is high. Only one worker is required, reducing the labor cost.

[0023] 2. The present invention can achieve one-time welding and continuous production, improving the processing efficiency.

[0024] 3. The feeding and positioning operations of the present invention are simple and time-saving.

[0025] 4. The present invention can achieve the detection of pre-welding and post-welding operations, improve the welding consistency, and ensure the welding quality. Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram of the spot welding device for the shock absorber piston rod stop ring of the present invention; Figure 2 is Figure 1 the three-dimensional structural schematic diagram after omitting the cabinet Figure 1 ; Figure 3 is Figure 1 the three-dimensional structural schematic diagram after omitting the cabinet Figure 2 ; Figure 4 is Figure 1 the top view after omitting the cabinet; Figure 5 is Figure 2 the side view after omitting the post-welding detection mechanism and the vision detection mechanism in Figure 6 is a structural schematic diagram showing multiple workstations on the workbench; Figure 7 is a structural schematic diagram showing the assembly structure between the workbench, the intermediate disc and the cam divider; Figure 8 Schematic three-dimensional structure diagram of the multi-point welding mechanism; Figure 9 is Figure 8 bottom view of Figure 10 Schematic three-dimensional structure diagram of the spot welding electrode; Figure 11 is Figure 10 planar cross-sectional view of Figure 12 Schematic three-dimensional structure diagram of the pressure block; Figure 13 Schematic three-dimensional structure diagram of the positioning mechanism; Figure 14 is Figure 13 planar cross-sectional view of Figure 15 Schematic structure diagram of the base; Figure 16 Schematic structure diagram of the spring limit mechanism; Figure 17 Schematic structure diagram of the stop ring positioning seat; Figure 18 Schematic structure diagram of the post-welding inspection mechanism;

[0027] Explanation of reference numerals: 1. Cabinet; 2. Working plate; 3. Positioning mechanism; 31. Base; 311. Bottom seat body; 312. Lifting block; 313. Mounting block; 3131. Mounting chute; 3132. Guide hole; 314. Lateral opening; 32. Stop ring positioning seat; 321. Lateral opening; 322. Guide groove; 33. Spring limiting mechanism; 331. Mounting part; 3311. Short shaft; 3312. Rotating shaft; 332. Main body part; 3321. V-shaped limiting surface; 3322. Guiding inclined surface; 3323. Limiting opening; 3324. Guiding opening; 333. Spring; 34. Piston rod positioning seat; 341. Bushing; 342. Piston rod positioning groove; 35. Tightening guide seat; 351. Perforation; 36. Connecting rod; 37. Support; 38. Intermediate plate; 39. Threaded sleeve; 4. Stepping drive mechanism; 41. Indexing plate; 5. Multi-point welding mechanism; 51. Welding frame; 52. Welding drive cylinder; 53. Welding arm; 54. Spot welding electrode; 541. Welding head; 542. Clamping part; 5421. Clamping groove; 543. Fixed part; 544. Liquid cooling hole; 545. Transition strengthening inclined surface; 6. Pre-welding detection mechanism; 61. Length detection mechanism; 611. First detection frame; 612. First detection cylinder; 613. First pressing part; 62. Direction detection mechanism; 7. Post-welding detection mechanism; 71. Second detection frame; 72. Lifting cylinder; 73. Second detection cylinder; 74. Second pressing part; 8. Pressing-down mechanism; 81. Pressing-down cylinder; 82. Pressing block; 821. Pressing claw; 822. Positioning hole; 9. Upward pressing mechanism; 10. Stop ring; 11. Piston rod; 12. Lifting cylinder; 13. Rotating power part; 131. Clutch part; 14. Adjusting shaft; 141. Power transmission part; 15. Transmission mechanism; 151. First bevel gear; 152. Second bevel gear; 153. Transmission shaft. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] An embodiment of the shock absorber piston rod stop ring spot welding device provided by the present invention: As Figure 1 and Figure 2 shown, the shock absorber piston rod stop ring spot welding device includes a cabinet 1 and a working plate 2, a stepping drive mechanism 4, a positioning mechanism 3, a pressing mechanism, a multi-point welding mechanism 5 and a detection mechanism arranged in the cabinet 1.

[0030] Specifically, a loading port is provided on the front side of the cabinet 1. Workers can put the piston rod 11 and the stop ring 10 into the cabinet 1 through the loading port for positioning and fixing, or take out the welded piston rod 11 and stop ring 10 from the loading port.

[0031] AsFigure 8 and Figure 9 As shown in Figure 9 , the multi - point welding mechanism 5 includes a welding frame 51 and four welding units evenly distributed in a circle on the welding frame 51. The included angle between any two adjacent welding units is 90°. Each welding unit includes a welding driving cylinder 52, a welding arm 53 connected to the output end of the welding driving cylinder 52, and a spot - welding electrode 54 connected to the welding arm 53. The spot - welding electrode 54 is integrally processed by a mold and is made of chromium - zirconium copper material as a whole, having high electrical conductivity, high temperature hardness retention rate, and anti - softening performance. As Figure 10 and Figure 11 shown, the spot - welding electrode 54 is a symmetrical structure as a whole, including a welding head 541, a clamping part 542, and a fixing part 543 connected in sequence. The symmetrical planes of the welding head 541, the clamping part 542, and the fixing part 543 coincide.

[0032] The welding head 541 is flat, having an upper plane, a lower plane, an end - welding plane, and an arc surface. The upper plane and the lower plane are parallel, the end - welding plane is connected between the upper plane and the lower plane, there are two arc surfaces, which are simultaneously connected to the upper plane, the lower plane, and the end - welding plane. The welding head 541 conducts electricity mainly through the end - welding plane. The clamping part 542 is cylindrical. The head of the clamping part 542 is connected to both the upper plane and the lower plane through a transition strengthening inclined plane 545. The transition strengthening inclined plane 545 can avoid stress concentration and improve the bending and torsional resistance of the whole spot - welding electrode 54. The outer side surface of the clamping part 542 is coplanar with the arc surface of the welding head 541, with better integrity. There are two clamping grooves 5421 symmetrically distributed on the clamping part 542 with respect to the above - mentioned symmetrical plane. The bottom of the clamping groove 5421 is parallel to the upper plane and the lower plane. The fixing part 543 is frustum - shaped, and its outer diameter gradually decreases from the end close to the clamping part 542 to the end far from the clamping part 542. The installation part 331 is used to be inserted into the welding arm 53 to realize the fixation of the whole spot - welding electrode 54. When the spot - welding electrode 54 is severely worn and needs to be replaced, by inserting the two clamping parts 542 of the clamping tool into the two clamping grooves 5421 respectively, the installation part 331 can be removed from the welding arm 53. Coaxial and through liquid - cooling holes 544 are provided in the fixing part 543 and the clamping part 542. By introducing coolant into the liquid - cooling holes 544, the welding head 541 can be cooled to ensure the normal operation of the welding head 541.

[0033] The spot - welding electrode 54 adopts a flat welding head 541, which increases the welding contact area with the stop ring 10. A larger welding contact area makes the welding current distribution more uniform, disperses the pressure on the stop ring 10 to a larger contact area, makes the contact with the stop ring 10 more stable, reduces the wear speed of the spot - welding electrode 54, and is beneficial to ensuring the consistency of welding.

[0034] During actual use, a connecting block can be set at the output end of the welding driving cylinder 52, a fixing block can be connected to the welding arm 53, and a transition block can be connected between the connecting block and the fixing block. The installation height of the spot welding electrode 54 can be adjusted by adjusting the installation height of the fixing block on the transition block. To ensure the stability of the movement of the welding arm 53, the transition block is in guiding fit with the welding frame 51.

[0035] Four welding units can perform four-point welding at one time, that is, the welding operation is completed at one time.

[0036] As Figure 6 shown, a plurality of feeding stations are evenly distributed in a circle on the working disk 2. In this embodiment, a total of six feeding stations are provided, and a positioning mechanism 3 is provided at each feeding station. The positioning mechanism 3 is used to position the piston rod 11 and the stop ring 10. In actual production, the number of feeding stations can be reasonably designed according to the sizes of the cabinet 1 and the working disk 2.

[0037] As Figure 5 shown, the step-by-step driving mechanism 4 adopts a common cam divider in the prior art. The cam divider has a dividing disk 41 that can perform intermittent indexing motion. As Figure 7 shown, the dividing disk 41 and the working disk 2 are arranged parallel to each other at an interval up and down, and the two are connected by a plurality of columns distributed in a circle. An intermediate disk 38 is also arranged in parallel between the dividing disk 41 and the working disk 2. Each column passes through the intermediate disk 38, and the intermediate disk 38 is provided with sliding sleeves at the positions corresponding to the columns, so that the intermediate disk 38 can slide up and down relative to each column. A regulating shaft 14 is coaxially connected between the dividing disk 41, the working disk 2 and the intermediate disk 38. Among them, the regulating shaft 14 is rotationally assembled with the working disk 2 and the dividing disk 41 through bearings respectively. The center position of the intermediate disk 38 has a threaded sleeve 39, and the regulating shaft 14 is threadedly connected with the threaded sleeve 39.

[0038] As Figure 3 and Figure 7 shown, a lifting cylinder 12 and a mounting plate are fixed on the welding frame 51. A mounting seat is slidably assembled on the mounting plate through a slide rail. The piston rod of the lifting cylinder 12 is fixed to the mounting seat, and a rotating power member 13 is fixed on the mounting seat. The rotating power member 13 is a servo motor.

[0039] The top of the adjusting shaft 14 protrudes upward out of the working disk 2, and is connected with a power transmission part 141. The rotating power part 13 is provided with a clutch part 131 for engaging or disengaging with the power transmission part 141. A transmission mechanism 15 is arranged between the part of the adjusting shaft 14 protruding out of the working disk 2 and the working disk 2. The transmission mechanism 15 is a bevel gear mechanism, including a first bevel gear 151, a second bevel gear 152, and a transmission shaft 153. The first bevel gear 151 is coaxially fixed on the adjusting shaft 14, the second bevel gear 152 is coaxially fixed on the transmission shaft 153, and the transmission shaft 153 is rotationally assembled on two spaced support seats through bearings, and the support seats are fixed on the working disk 2. During the process of the lifting cylinder 12 extending downward, the clutch part 131 and the power transmission part 141 can be engaged. The engagement between the clutch part 131 and the power transmission part 141 is a plug-in fit. After plugging, there will be no relative rotation between the two. At this time, when the working disk 2 rotates, the adjusting shaft 14 is driven to rotate through the bevel gear mechanism, and then the lifting of the intermediate disk 38 is realized through the threaded sleeve 39. During the process of the lifting cylinder 12 retracting upward, the power transmission part 141 can be disengaged from the clutch part 131. At this time, the working disk 2, the intermediate disk 38, and the indexing disk 41 are an integral whole and rotate synchronously.

[0040] In this embodiment, as Figure 13 shown, the positioning mechanism 3 includes a base 31, a stop ring positioning seat 32, a spring limiting mechanism 33, a piston rod positioning seat 34, and a top tightening guide seat 35.

[0041] Specifically, the base 31 is a split structure. As Figure 15 shown, it includes a bottom seat body 311, a heightening block 312, and an installation block 313 that are split and arranged in sequence from bottom to top. Among them, a positioning installation groove is provided on the bottom seat body 311, the heightening block 312 is placed in the positioning installation groove, and a bottom fixing hole is provided at the bottom of the bottom seat body 311. A bolt for fixing the heightening block 312 is inserted through the bottom fixing hole, so as to detachably assemble the heightening block 312 and the bottom seat body 311 together. The heightening block 312 is a stepped structure, and a sliding installation opening is provided on one side thereof, and the installation block 313 is inserted into the sliding installation opening. The heightening block 312 is provided with a side fixing hole on the side facing away from the sliding installation opening, and a bolt for fixing the installation block 313 is inserted through the side fixing hole, so as to detachably assemble the installation block 313 and the heightening block 312 together.

[0042] The bottom seat body 311, the heightening block 312, and the installation block 313 are all provided with a laterally penetrating opening 314 that penetrates up and down on the same side. The laterally penetrating opening 314 allows the piston rod to be inserted or taken out from the side of the base 31. When the above bolts are removed, the heightening block 312 can slide out laterally from the bottom seat body 311, and the installation block 313 can slide out laterally from the heightening block 312.

[0043] The stop ring positioning seat 32 is arranged in the lateral opening 314 and assembled in the mounting block 313. The mounting block 313 is provided with a mounting chute 3131 adapted to the stop ring positioning seat 32. The bottom of the mounting chute 3131 is used for stop cooperation with the stop ring positioning seat 32 in the up and down directions. The stop ring positioning seat 32 can be quickly positioned and assembled in the mounting block 313 through the mounting chute 3131. The stop ring positioning seat 32 is provided with a lateral opening 321. The lateral opening 321 is a U-shaped opening, which has the same orientation as the lateral opening 314 and is vertically communicated with the lateral opening 314. The diameter of the lateral opening 321 is smaller than the minimum diameter of the lateral opening 314. The top surface of the stop ring positioning seat 32 forms a stop positioning surface, which is located above the lateral opening 314 and is used for stop cooperation with the stop ring. The piston rod can be inserted into the lateral opening 321 from the lateral opening 314. The stop ring 10 is sleeved on the piston rod 11 and slides down to the above-mentioned stop positioning surface to realize the positioning of the stop ring 10. It should be noted that the diameter of the lateral opening 321 should be larger than the diameter of the part of the piston rod 11 that is inserted.

[0044] The stop ring positioning seat 32 is provided with a guide groove 322 extending in the up and down directions. The mounting block 313 is provided with a guide hole 3132 corresponding to the guide groove 322. A guide member for extending into the guide groove 322 is inserted into the guide hole 3132 to ensure that the lateral opening 321 on the stop ring positioning seat 32 has an accurate orientation during installation.

[0045] As Figure 13 shown, the spring limiting mechanism 33 is arranged below the entire base 31 and includes two symmetrically arranged spring claws and a spring 333 connected to the same end of the two spring claws. As Figure 16As shown, each spring claw includes a mounting portion 331 and a main body portion 332. The mounting portion 331 is rotationally assembled with the bottom seat body 311 through a rotating shaft 3312. A short shaft 3311 is further provided on the mounting portion 331, and the axis of the short shaft 3311 is perpendicular to the axis of the rotating shaft 3312. A spring 333 is sleeved on the two short shafts 3311, and both ends are respectively fixed to the two mounting portions 331. The main body portion 332 is detachably fixed to the mounting portion 331 by bolts. A V-shaped limiting surface 3321 and a guiding inclined surface 3322 are provided on the main body portion 332. In the natural state of the spring 333, a limiting opening 3323 is formed between the two V-shaped limiting surfaces 3321, and the limiting opening 3323 is vertically opposite to the lateral opening 321. The limiting opening 3323 can straighten the piston rod 11, keep the piston rod 11 centered, and prevent the piston rod 11 from tilting during the rotation of the working disk 2. A guiding opening 3324 is formed between the two guiding inclined surfaces 3322. The distance between the guiding inclined surfaces 3322 of the two spring claws gradually decreases in the radial direction of the piston rod 11 from the direction away from the lateral opening 314 towards the direction close to the lateral opening 314, and the minimum diameter of the guiding opening 3324 is smaller than the diameter of the part of the piston rod 11 inserted into the lateral opening 321.

[0046] The piston rod positioning seat 34 is located below the spring limiting mechanism 33 and is arranged corresponding to the base 31 one by one. A support 37 is provided on the intermediate disk 38 at a position corresponding to each piston rod positioning seat 34. As Figure 14 shown, the piston rod positioning seat 34 is in a T shape and includes a large-diameter section located above and a small-diameter section located below. The small-diameter section passes through the support 37 downward, and the large-diameter section is in a stop fit with the support 37 in the up-down direction. A piston rod positioning groove 342 for the piston rod 11 to be inserted is formed on the large-diameter section and the small-diameter section and communicates up and down. A bushing 341 is coaxially provided in the large-diameter section, and a jack for the piston rod 11 to be inserted is formed on the bushing 341.

[0047] As Figure 13 shown, the tightening and guiding seat 35 is located below the piston rod positioning seat 34 and is located between the intermediate disk 38 and the indexing disk 41. The two are connected to the base 31 through a plurality of connecting rods 36. A through hole 351 coaxial with the piston rod positioning groove 342 is formed on the tightening and guiding seat 35. The lower end of the piston rod 11 is inserted into the above-mentioned jack and extends into the piston rod positioning groove 342.

[0048] As Figure 2 and Figure 5As shown in the figure, the pressing mechanism is arranged at a position corresponding to the welding mechanism, and includes a downward pressing mechanism 8 and an upward pushing mechanism 9. The downward pressing mechanism 8 is assembled on the welding frame 51 and is used for pressing the retaining ring and the piston rod downward. The upward pushing mechanism 9 is opposite to the downward pressing mechanism 8 up and down. The output end of the upward pushing mechanism 9 is used to pass through the through hole 351 on the corresponding tightening guide seat 35 to upwardly press the piston rod positioning seat 34. Since the piston rod positioning seat 34 is blocked by the step at the bottom of the piston rod 11, when the height of the intermediate disc 38 is adjusted, the height of the piston rod positioning seat 34 is also adjusted synchronously. At this time, the welding position of the retaining ring 10 on the piston rod 11 can be adjusted.

[0049] In this embodiment, the downward pressing mechanism 8 includes a downward pressing cylinder 81 and a pressing block 82 connected to the power output end of the downward pressing cylinder 81. As Figure 12 shown, a positioning hole 822 adapted to the top of the piston rod 11 is provided at the center of the pressing block 82, and a plurality of pressing claws 821 for pressing the retaining ring are arranged around the positioning hole 822 on the pressing block 82. As Figure 5 shown, the upward pushing mechanism 9 is a servo electric cylinder. The output rod of the servo electric cylinder is used to pass through the through hole 351 to upwardly press the piston rod positioning seat 34. Under the pushing action of the servo electric cylinder, the piston rod positioning seat 34 can move up and down until the piston rod positioning seat 34 is tightly pressed. The function of the servo electric cylinder is to ensure the accurate spot welding position of the retaining ring 10.

[0050] As Figure 2 and Figure 3 shown, the detection mechanism includes a pre-welding detection mechanism 6 and a post-welding detection mechanism 7 arranged on the front and rear sides of the welding mechanism. The pre-welding detection mechanism 6 is used to detect the length of the piston rod and the placement directions of the piston rod 11 and the retaining ring 10; the post-welding detection mechanism 7 is used to detect the welding position of the retaining ring 10. Among them, there are two pre-welding detection mechanisms 6, namely a length detection mechanism 61 and a direction detection mechanism 62.

[0051] Specifically, as Figure 3As shown, the length detection mechanism 61 includes a first detection frame 611, a first detection cylinder 612 mounted on the first detection frame 611, and a first pressing member 613 connected to the output end of the first detection cylinder 612. After the piston rod 11 is manually placed laterally from the feeding port into the limiting port 3323 and the side opening, the working disk 2 rotates to move the just-placed piston rod 11 and the retaining ring 10 to the position of the first detection cylinder 612. At this time, the first detection cylinder 612 extends downward, and the top of the piston rod 11 can be pressed down by the first pressing member 613 to stably insert the lower end of the piston rod 11 into the piston rod positioning seat 34. A first displacement sensor is installed in the first detection cylinder 612 to detect the moving stroke of the first detection cylinder 612, that is, the moving stroke of the first pressing member 613. The control system is set with a qualified displacement range value. When the displacement value detected by the first displacement sensor is within the above displacement range, it can be determined that the length of the loaded piston rod 11 meets the requirements. When the displacement value detected by the first displacement sensor exceeds the above displacement range, it can be determined that the length of the loaded piston rod 11 does not meet the requirements, and then an alarm is given to prompt the worker to replace the piston rod 11.

[0052] The direction detection mechanism 62 uses a vision detection camera. The vision detection motor is fixed on the welding frame 51 through a bracket. The vision detection camera can detect whether the upper and lower ends of the piston rod 11 are reversed and whether the retaining ring 10 is reversed by taking pictures.

[0053] As Figure 18As shown in the figure, the post-welding inspection mechanism 7 includes a second inspection frame 71, a second inspection cylinder 73 fixed to the upper side of the second inspection frame 71, a lifting cylinder 72 fixed to the lower side of the second inspection frame 71, and a second pressing member 74. The second inspection cylinder 73 is used to drive the second pressing member 74 to move up and down. A guiding track for ensuring the straightness of the movement of the second pressing member 74 is provided on the second inspection frame 71. A detection hole adapted to the top of the piston rod 11 is provided on the second pressing member 74. The detection hole is a stepped hole. When the second pressing member 74 moves downward in place, the step at the top of the piston rod 11 is exactly located in the detection hole, and the second pressing member 74 and the piston rod 11 are in a blocking fit in the up and down directions. A second displacement sensor for detecting the moving stroke of the second pressing member 74 is installed in the second inspection cylinder 73. When the welding of the piston rod 11 and the stop ring 10 is completed and the workbench 2 rotates to the post-welding inspection mechanism 7, the output rod of the lifting cylinder 72 passes through the through hole 351 on the top-tight guiding seat 35, and the piston rod positioning seat 34 is jacked up, ensuring that the bottom ends of the piston rods at each loading station rotated to the post-welding inspection mechanism 7 are at the same height; the second inspection cylinder 73 extends downward to drive the second pressing member 74 to press downward on the top of the piston rod. The control system is set with a qualified displacement range value. When the displacement value detected by the second displacement sensor is within the above displacement range, it can be judged that the welding position of the stop ring is accurate. When the displacement value detected by the second displacement sensor exceeds the above displacement range, it can be judged that the welding position of the stop ring 10 is too high or too low, and then an alarm is given to prompt the worker to remove and classify the unqualified products.

[0054] In this embodiment, both the first displacement sensor and the second displacement sensor adopt magnetostrictive displacement sensors. The magnetostrictive displacement sensor is a prior art and will not be elaborated here in detail.

[0055] The working process of the shock absorber piston rod stop ring spot welding device of the present invention is as follows: The operator places the piston rod 11 and the stop ring 10 at the positioning mechanism 3 of the loading station through the loading port on the front side of the cabinet 1, and starts the cam type indexing device. The workbench 2 rotates 60° each time. The operator loads each loading station one by one, and the positioned piston rod 11 and stop ring 10 pass through the length detection mechanism 61, the direction detection mechanism 62, the multi-point welding mechanism 5, and the post-welding inspection mechanism 7 in sequence, and finally return to the loading port again. The operator takes out the welded piston rod and stop ring one by one.

[0056] The present invention adopts an integrated shock absorber piston rod stop ring spot welding device, which has a compact structure, small occupied space, high safety, can realize continuous welding production operation, improves welding efficiency, and at the same time ensures welding quality.

[0057] Based on the above description of this specification, those skilled in the art can also understand the following terms used, such as terms indicating orientation or positional relationship like "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. These are based on the orientation or positional relationship shown in the accompanying drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0058] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Shock absorber piston rod stop ring spot welding device, characterized in that, It includes a cabinet body, a working plate, a step-by-step driving mechanism, a positioning mechanism, a pressing mechanism, a multi-point welding mechanism and a detection mechanism arranged in the cabinet body. There is a loading port opened on the cabinet body: There are multiple loading stations evenly distributed in a circle on the working plate. The positioning mechanism is arranged at each loading station and is used to position the piston rod and the stop ring; The step-by-step driving mechanism is in transmission connection with the working plate and is used to drive the working plate to rotate step by step, so that the loading stations rotate to the welding mechanism one by one; The pressing mechanism is arranged at the multi-point welding mechanism and is used to press the piston rod and the stop ring on the loading station that rotates to the multi-point welding mechanism; The multi-point welding mechanism is used to perform multi-point welding on the piston rod and the stop ring positioned at the loading station; The detection mechanism includes a pre-welding detection mechanism and a post-welding detection mechanism arranged on the front and rear sides of the welding mechanism. The pre-welding detection mechanism is used to detect the length of the piston rod and the placement directions of the piston rod and the stop ring; the post-welding detection mechanism is used to detect the welding position of the stop ring.

2. The shock absorber piston rod stop ring spot welding device according to claim 1, characterized in that, The multi-point welding mechanism includes a welding frame and four welding units evenly distributed in a circle and assembled on the welding frame. Each welding unit includes a welding driving cylinder, a welding arm connected to the output end of the welding driving cylinder, and a spot welding electrode connected to the welding arm. The spot welding electrode has a flat welding head.

3. The shock absorber piston rod stop ring spot welding device according to claim 2, characterized in that The pressing mechanism includes a downward pressing mechanism and an upward pressing mechanism arranged oppositely. The downward pressing mechanism is assembled on the welding frame and is used to press the stop ring and the piston rod downward. The upward pressing mechanism is used to press the piston rod positioning seat upward.

4. The shock absorber piston rod stop ring spot welding device according to claim 1, characterized in that, The positioning mechanism includes a base, a stop ring positioning seat, a spring limiting mechanism, and a piston rod positioning seat; there is a laterally opened hole extending in the up and down direction on the base. The stop ring positioning seat is arranged in the laterally opened hole. The stop ring positioning seat has a lateral opening and a blocking positioning surface. The blocking positioning surface is located above the laterally opened hole and is used to cooperate with the stop ring for blocking. The lateral opening is vertically communicated with the laterally opened hole and the diameter of the lateral opening is not larger than the minimum diameter of the laterally opened hole, and is used for the piston rod to be inserted and taken out along its radial direction; the spring limiting mechanism includes two spring claws and a spring connected to the same end of the two spring claws. Each spring claw is rotatably assembled with the base. In the natural state of the spring, a guiding opening and a limiting opening are formed between the two spring claws. The limiting opening is vertically opposite to the lateral opening. The piston rod is placed at the lateral opening and the limiting opening through the guiding opening; there is a piston rod positioning groove for the piston rod to be inserted on the piston rod positioning seat, and the top of the piston rod positioning seat is used to cooperate with the step on the piston rod for blocking.

5. The shock absorber piston rod stop ring spot welding device according to claim 4, characterized in that, The spring claw includes a main body part and a mounting part that are detachably connected. The limiting opening and the guiding opening are formed between the two main body parts; the stop ring mounting seat is detachably connected to the base.

6. The shock absorber piston rod stop ring spot welding device according to claim 1 or 4, characterized in that The mounting height of the piston rod positioning seat is adjustable.

7. The shock absorber piston rod stop ring spot welding device according to claim 6, characterized in that, The step-by-step drive mechanism includes an indexing plate capable of intermittent indexing movement. The indexing plate and the working plate are fixedly connected by multiple columns. An adjusting plate is arranged in parallel between the indexing plate and the working plate and is in guiding sliding fit with each column. The piston rod positioning seat is arranged on the adjusting plate. A regulating shaft is coaxially rotatably assembled between the working plate and the indexing plate, and the regulating shaft is threadedly connected to the adjusting plate. The top of the regulating shaft is connected with a power transmission part. A rotatable power part capable of lifting is arranged in the cabinet body, and the rotatable power part has a clutch part for engaging or disengaging with the power transmission part. A transmission mechanism is arranged between the part of the regulating shaft extending out of the working plate and the working plate. The transmission mechanism drives the regulating shaft to rotate when the power transmission part and the clutch part are engaged, so as to lift the adjusting plate.

8. The shock absorber piston rod stop ring spot welding device according to claim 7, characterized in that, The transmission mechanism is a bevel gear mechanism, including a first bevel gear, a second bevel gear and a transmission shaft. The first bevel gear is coaxially fixed on the regulating shaft, the second bevel gear is coaxially fixed on the transmission shaft, and the transmission shaft is rotatably assembled on the working plate through a support seat.

9. The shock absorber piston rod stop ring spot welding device according to claim 1, characterized in that, The pre-welding detection mechanism includes a length detection mechanism and a direction detection mechanism. The length detection mechanism includes a first detection cylinder located in the cabinet body and a first pressing part connected to the output end of the first detection cylinder. The first pressing part is used for pressing down the piston rod. A first displacement sensor is installed in the first detection cylinder to detect the moving stroke of the first pressing part. The direction detection mechanism includes a vision detection camera.

10. The shock absorber piston rod stop ring spot welding device according to claim 9, characterized in that The post-welding detection mechanism includes a jacking cylinder, a second detection cylinder and a second pressing part. The output end of the jacking cylinder is used for jacking up the piston rod positioning seat so that the piston rod positioning seat is kept at a set height. The second detection cylinder is used for driving the second pressing part to move up and down. A second displacement sensor for detecting the moving stroke of the second pressing part is installed in the second detection cylinder, and a detection hole adapted to the top of the piston rod is arranged on the second pressing part.

Images