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

Abstract

The utility model 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 automatic spot welding check ring device can solve the technical problems that in the prior art, an automatic spot welding check ring device for a shock absorber is low in welding efficiency, and welding quality is not easy to guarantee.

Description

Technical Field

[0001] This utility model belongs to the technical field of shock absorber components, specifically relating to a spot welding device for a shock absorber piston rod stop ring. Background Technology

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

[0003] In the prior art, a spot welding device is typically used to weld the retaining ring to the piston rod of the shock absorber. The structure of the spot welding device is shown in the automatic spot welding retaining ring device for shock absorbers disclosed in Chinese Utility Model Patent No. CN213105044U. It includes a horizontally arranged equipment connecting plate, a moving module on the top of the floating base plate, the moving module including an adjusting screw and a guide rod, a slider on the moving module, an adjusting handwheel on the left end of the adjusting screw, a rotary cylinder on the slider, the rotating disk of the rotary cylinder is arranged to the left, a rotary cylinder connecting block is provided on the left side of the rotating disk of the rotary cylinder, a gripper cylinder is fixed on the left side of the rotary cylinder connecting block, the gripper of the gripper cylinder is arranged to the left, a retaining ring positioning block is arranged vertically upward on the left side of the top surface of the floating base plate, an upper electrode is provided at the top relative position of the retaining ring (i.e., the retaining ring), a lower electrode is provided at the bottom relative position of the retaining ring, the upper electrode is spaced apart from the retaining ring, and the lower electrode is spaced apart from the retaining ring.

[0004] Before welding, the piston rod of the automatic spot welding retaining ring device for the above-mentioned vibration damper needs to be manually passed through the retaining ring and inserted into the through hole of the retaining ring positioning block. Then, the first adjusting wheel is manually rotated to adjust the relative position of the guide rod and the piston rod to complete the positioning of the piston rod and the retaining ring. In order to ensure the welding quality, multi-point welding is required, and the piston rod and the retaining ring need to be flipped. Therefore, two welding operations are performed. After the welding is completed, the clamping cylinder is released and the piston rod and the retaining ring are manually removed. While the aforementioned automatic spot welding retaining ring device for vibration dampers can reliably position the piston rod and retaining ring, it involves too many manual steps. Furthermore, the lack of constraint on one end of the retaining ring makes it difficult to ensure the accurate welding position of the retaining ring on the piston rod during welding, resulting in inconsistent welding quality. Manual inspection of the retaining ring's welding position is required after welding. Additionally, the welding device must wait for each welded piston rod and retaining ring to be removed and repositioned before continuing operation, necessitating frequent manual assembly and disassembly of the piston rod and retaining ring. Moreover, the welding operation must be performed in two stages, leading to low welding efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a spot welding device for the 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 in the existing automatic spot welding retaining ring device for shock absorbers.

[0006] To solve the above problems, the shock absorber piston rod stop ring spot welding device provided by this utility model adopts the following technical solution:

[0007] A vibration damper piston rod stop ring spot welding device includes a cabinet and a work plate, a stepping drive mechanism, a positioning mechanism, a clamping mechanism, a multi-point welding mechanism, and a detection mechanism housed within the cabinet. The cabinet has a loading port. The work plate has multiple loading stations evenly distributed circumferentially. Each loading station is equipped with the positioning mechanism, which positions the piston rod and stop ring. The stepping drive mechanism is connected to the work plate and drives it to rotate stepwise, causing each loading station to rotate sequentially to the welding mechanism. The clamping mechanism is located at the welding mechanism and clamps the piston rod and stop ring at the loading station that has rotated to the multi-point welding mechanism. The multi-point welding mechanism performs multi-point welding on the positioned piston rod and stop ring at the loading station. The detection mechanism includes a visual inspection mechanism and a post-weld inspection mechanism located on both sides of the welding mechanism.

[0008] Beneficial effects: This utility model integrates the feeding, positioning, clamping, welding, pre-welding and post-welding inspection of piston rods and stop rings into a single cabinet, resulting in a compact overall structure, high degree of automation, and high safety. The use of a worktable with multiple feeding stations, combined with intermittent drive of a stepper drive mechanism, enables parallel processing of multiple stations, improving the continuous production capacity of the entire damper piston rod and stop ring spot welding device. Manual labor is reduced to only feeding and unloading materials. The multi-point welding mechanism allows for simultaneous welding at multiple locations, improving welding efficiency. The inspection mechanism performs inspections before and after welding, ensuring welding quality and reducing material waste.

[0009] Furthermore, the multi-point welding mechanism includes a welding frame and four welding units evenly distributed around the circumference, each welding unit including 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. The spot welding electrode has a flat welding head.

[0010] Beneficial effects: It can achieve welding at four points in one operation, eliminating the need for multiple welding operations; the spot welding electrode uses a flat welding head, which increases the welding contact area with the stop ring. The larger welding contact area makes the welding current distribution more uniform, reducing the current density per unit area. The uniform current density reduces 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, avoiding the problem of spatter adhering to the surface of the spot welding electrode and accelerating wear; the flat welding head disperses the pressure of the stop ring over a larger contact area, making the contact with the stop ring more stable, reducing the frequency of grinding in actual use, and making the welding quality more stable.

[0011] Furthermore, the clamping mechanism includes a downward pressing mechanism and an upward pressing mechanism arranged opposite to each other. The downward pressing mechanism is mounted on the welding frame and is used to press the stop ring and piston rod downward, while the upward pressing mechanism is used to press the piston rod positioning seat upward.

[0012] Beneficial effects: The downward pressing mechanism and the upward pressing mechanism are arranged separately, which can press the piston rod and the stop ring from both the top and bottom directions, ensuring that the piston rod and the stop ring are reliably positioned.

[0013] Furthermore, the positioning mechanism includes a base, a stop ring positioning seat, a spring limiting mechanism, and a piston rod positioning seat. The base has a lateral opening extending vertically. The stop ring positioning seat is disposed within the lateral opening and has a lateral opening and a stop positioning surface. The stop positioning surface is located above the lateral opening and is used to stop and cooperate with the stop ring. The lateral opening is vertically connected to the lateral opening, and the diameter of the lateral opening is not greater than the minimum diameter of the lateral opening, allowing the piston rod to be inserted and removed radially. The spring limiting mechanism includes two pawls and a spring connected to the same end of the two pawls. Each pawl is rotatably assembled with the base. In its natural state, the spring forms a guide port and a limiting port between the two pawls. The limiting port is vertically opposite to the lateral opening, and the piston rod is inserted into the lateral opening and the limiting port through the guide port. The piston rod positioning seat has a piston rod positioning groove for piston rod insertion, and the top of the piston rod positioning seat is used to stop and cooperate with the step on the piston rod.

[0014] Beneficial effects: During use, the piston rod with the stop ring fitted is inserted from the guide port through the lateral opening into the position of the limiting port and the lateral opening. The lower end of the piston rod is inserted into the piston rod positioning seat, and the step of the piston rod makes stop contact with the piston rod positioning seat. The stop ring is positioned on the stop ring positioning seat through the stop positioning surface, realizing rapid positioning of the piston rod and the stop ring, improving the positioning efficiency of the piston rod and the stop ring. After welding is completed, simply open the guide port and pull the bottom end of the piston rod out of the piston rod positioning seat. The piston rod and the stop ring can then be quickly pulled out from the lateral opening. The entire positioning and disassembly process is simple and quick, ensuring welding efficiency.

[0015] Furthermore, the spring claw includes a detachably connected main body and a mounting part, with the limiting port and guide port formed between the two main body parts; the stop ring mounting seat is detachably connected to the base.

[0016] Beneficial effects: When the main body is damaged, it can be removed and replaced from the mounting part without replacing the entire spring limiting mechanism; in addition, different sizes of main bodies can be replaced to limit piston rods of different diameters, improving the versatility of the entire spot welding device.

[0017] Furthermore, the installation height of the piston rod positioning seat is adjustable.

[0018] Beneficial effects: Because the piston rod positioning seat is stopped by the step at the bottom of the piston rod, when the height of the piston rod positioning seat is adjusted, its stopping position with the step on the piston rod changes. Correspondingly, the length of the piston rod extending out of the stop ring positioning seat will change, thereby adjusting the welding position of the stop ring on the piston rod, ensuring that the welding position of the stop ring on each loading station is uniform and ensuring the consistency of welding.

[0019] Furthermore, the stepper drive mechanism includes an indexing plate capable of intermittent indexing motion. The indexing plate and the working plate are fixedly connected by multiple columns. An adjusting plate, which slides and guides each column, is provided parallel to the indexing plate and the working plate. A piston rod positioning seat is mounted on the adjusting plate. An adjusting shaft is coaxially rotatably mounted between the working plate and the indexing plate. The adjusting shaft is threadedly connected to the adjusting plate. A power transmission part is connected to the top of the adjusting shaft. A rotating power component capable of lifting and lowering is provided inside the cabinet. The rotating power component has a clutch part for engaging or disengaging with the power transmission part. A transmission mechanism is provided between the portion of the adjusting shaft extending out of the working plate and the working plate. When the power transmission part and the clutch part are engaged, the transmission mechanism drives the adjusting shaft to rotate, thereby raising and lowering the adjusting plate.

[0020] Beneficial effects: The height of the piston rod positioning seat can be automatically adjusted, the overall structure is compact and does not take up too much space in the cabinet height; the rotating power component is driven on demand, which can reduce energy consumption; the use of a screw and nut type transmission structure can achieve precise adjustment of the height position of the intermediate plate.

[0021] 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 adjusting shaft, the second bevel gear is coaxially fixed on the transmission shaft, and the transmission shaft is rotatably mounted on the working disc via a support base.

[0022] Furthermore, the pre-welding inspection mechanism includes a length inspection mechanism and a direction inspection mechanism. The length inspection mechanism includes a first inspection cylinder located inside the cabinet and a first pressing member connected to the output end of the first inspection cylinder. The first pressing member is used to press down the piston rod. A first displacement sensor is installed inside the first inspection cylinder to detect the movement stroke of the first pressing member. The direction inspection mechanism includes a visual inspection camera.

[0023] Furthermore, the post-weld inspection mechanism includes a lifting cylinder, a second inspection cylinder, and a second pressure component. The output end of the lifting cylinder is used to lift the piston rod positioning seat so that the piston rod positioning seat is held at a set height. The second inspection cylinder is used to drive the second pressure component to move up and down. A second displacement sensor for detecting the movement stroke of the second pressure component is installed inside the second inspection cylinder. The second pressure component is provided with an inspection hole adapted to the top of the piston rod.

[0024] The beneficial effects of this utility model are:

[0025] 1. This utility model integrates the feeding, positioning and clamping, welding, pre-welding and post-welding inspection of piston rod and stop ring into one cabinet. The overall structure is compact, highly automated and safe, requiring only one worker, thus reducing labor costs.

[0026] 2. This utility model can achieve one-time welding and continuous production, thus improving processing efficiency.

[0027] 3. The feeding and positioning operations of this utility model are simple and save time.

[0028] 4. This utility model can realize the inspection of pre-welding and post-welding operations, improve the consistency of welding, and ensure the quality of welding. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the spot welding device for the piston rod stop ring of the shock absorber of this utility model.

[0030] Figure 2 for Figure 1 3D structural diagram after omitting the cabinet Figure 1 ;

[0031] Figure 3 for Figure 1 3D structural diagram after omitting the cabinet Figure 2 ;

[0032] Figure 4 for Figure 1 A top view omitting the cabinet body;

[0033] Figure 5 for Figure 2 Side view of the post-weld inspection agency and visual inspection agency in the central and provincial provinces;

[0034] Figure 6 To show the structural diagram of multiple workstations on the worktable;

[0035] Figure 7 This is a schematic diagram showing the assembly structure between the working plate, the intermediate plate, and the cam divider;

[0036] Figure 8 A three-dimensional structural diagram of a multi-point welding mechanism;

[0037] Figure 9 for Figure 8 A bottom view;

[0038] Figure 10 This is a schematic diagram of the three-dimensional structure of a spot welding electrode;

[0039] Figure 11 for Figure 10 A planar sectional view;

[0040] Figure 12 This is a schematic diagram of the three-dimensional structure of the pressing block;

[0041] Figure 13 A three-dimensional structural diagram of the positioning mechanism;

[0042] Figure 14 for Figure 13 A planar sectional view;

[0043] Figure 15 This is a schematic diagram of the base structure;

[0044] Figure 16 This is a schematic diagram of the spring limiting mechanism;

[0045] Figure 17 A schematic diagram of the stop ring positioning seat;

[0046] Figure 18 This is a schematic diagram of the post-weld inspection mechanism.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Cabinet; 2. Work tray; 3. Positioning mechanism; 31. Base; 311. Bottom seat; 312. Raising block; 313. Mounting block; 3131. Mounting slide; 3132. Guide hole; 314. Side opening; 32. Stop ring positioning seat; 321. Side opening; 322. Guide groove; 33. Spring limiting mechanism; 331. Mounting part; 3311. Short shaft; 3312. Rotating shaft; 332. Main body; 3321. V-shape Limiting surface; 3322, Guide slope; 3323, Limiting port; 3324, Guide port; 333, Spring; 34, Piston rod positioning seat; 341, Bushing; 342, Piston rod positioning groove; 35, Tightening guide seat; 351, Through hole; 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. Fixing part; 544. Liquid cooling hole; 545. Transition reinforcing slope; 6. Pre-welding inspection mechanism; 61. Length inspection mechanism; 611. First inspection frame; 612. First inspection cylinder; 613. First clamping component; 62. Direction inspection mechanism; 7. Post-welding inspection mechanism; 71. Second inspection frame; 72. Lifting cylinder 73. Second detection cylinder; 74. Second pressing component; 8. Pressing mechanism; 81. Pressing cylinder; 82. Pressing block; 821. Pressing claw; 822. Positioning hole; 9. Upper lifting mechanism; 10. Stop ring; 11. Piston rod; 12. Lifting cylinder; 13. Rotational power component; 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

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0050] An embodiment of the vibration damper piston rod stop ring spot welding device provided by this utility model:

[0051] like Figure 1 and Figure 2 As shown, the damper 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 clamping mechanism, a multi-point welding mechanism 5, and a detection mechanism installed in the cabinet 1.

[0052] Specifically, a loading port is provided on the front side of the cabinet 1. Workers can insert the piston rod 11 and the stop ring 10 into the cabinet 1 through the loading port for positioning and fixing, or they can take out the piston rod 11 and the stop ring 10 after welding through the loading port.

[0053] like Figure 8 and Figure 9 As shown, the multi-point welding mechanism 5 includes a welding frame 51 and four welding units evenly distributed circumferentially on the welding frame 51, with the included angle between any two adjacent welding units being 90°. Each welding unit includes a welding drive cylinder 52, a welding arm 53 connected to the output end of the welding drive cylinder 52, and a spot welding electrode 54 connected to the welding arm 53. The spot welding electrode 54 is integrally molded and made of chromium zirconium copper material, possessing high conductivity, high-temperature hardness retention, and resistance to softening. Figure 10 and Figure 11 As shown, the spot welding electrode 54 has a symmetrical structure, including a welding head 541, a clamping part 542 and a fixing part 543 connected in sequence, and the symmetrical planes of the welding head 541, the clamping part 542 and the fixing part 543 coincide.

[0054] The welding head 541 is flat and has an upper plane, a lower plane, an end welding plane, and an arc surface. The upper and lower planes are parallel, and the end welding plane connects the upper and lower planes. There are two arc surfaces that connect the upper, lower, and end welding planes. The welding head 541 conducts electricity mainly through the end welding planes. The clamping part 542 is cylindrical. The head of the clamping part 542 is connected to both the upper and lower planes by transition reinforcing slopes 545. The transition reinforcing slopes 545 can avoid stress concentration and improve the bending and torsional resistance of the entire spot welding electrode 54. The outer surface of the clamping part 542 is coplanar with the arc surface of the welding head 541, resulting in better overall integrity. Two clamping grooves 5421 are symmetrically distributed on the clamping part 542 about the aforementioned symmetrical planes. The bottom of the clamping grooves 5421 is parallel to the upper and lower planes. The fixing part 543 is frustoconical in shape, with its outer diameter gradually decreasing from the end near the clamping part 542 to the end away from the clamping part 542. The mounting part 331 is used to insert into the welding arm 53 to fix the entire spot welding electrode 54. When the spot welding electrode 54 is severely worn and needs to be replaced, the mounting part 331 can be removed from the welding arm 53 by inserting the two clamping parts 542 of the clamping tool into the two clamping grooves 5421 respectively. The fixing part 543 and the clamping part 542 are provided with coaxial and through liquid cooling holes 544. 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.

[0055] The spot welding electrode 54 adopts a flat welding head 541, which increases the welding contact area with the stop ring 10. The larger welding contact area makes the welding current distribution more uniform, disperses the pressure on the stop ring 10 to a larger contact area, and makes the contact with the stop ring 10 more stable. This reduces the wear rate of the spot welding electrode 54 and helps to ensure the consistency of the welding.

[0056] In practical use, a connecting block can be set at the output end of the welding drive 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 and the welding frame 51 are guided and matched.

[0057] The four welding units can perform four-point welding at once, meaning the welding operation is completed in one go.

[0058] like Figure 6 As shown, the work tray 2 has multiple loading stations evenly distributed in a circle. In this embodiment, there are six loading stations in total, and each loading station is equipped with a positioning mechanism 3. The positioning mechanism 3 is used to position the piston rod 11 and the stop ring 10. In actual production, the number of loading stations can be reasonably designed according to the size of the cabinet 1 and the size of the work tray 2.

[0059] like Figure 5 As shown, the stepper drive mechanism 4 adopts a cam divider commonly used in the prior art. The cam divider has an indexing plate 41 capable of intermittent indexing motion, such as... Figure 7 As shown, the indexing plate 41 and the working plate 2 are arranged parallel to each other vertically and are connected by multiple circumferentially distributed columns. An intermediate plate 38 is also arranged parallel to the indexing plate 41 and the working plate 2. Each column passes through the intermediate plate 38, and the intermediate plate 38 has sliding sleeves at the corresponding positions of each column, allowing the intermediate plate 38 to slide vertically relative to each column. An adjusting shaft 14 is coaxially connected to the indexing plate 41, the working plate 2, and the intermediate plate 38. The adjusting shaft 14 is rotatably assembled with both the working plate 2 and the indexing plate 41 via bearings. A threaded sleeve 39 is located at the center of the intermediate plate 38, and the adjusting shaft 14 is threadedly connected to the threaded sleeve 39.

[0060] like Figure 3 and Figure 7 As shown, a lifting cylinder 12 and a mounting plate are fixed on the welding frame 51. A mounting seat is slidably mounted on the mounting plate via a slide rail. The piston rod of the lifting cylinder 12 is fixed to the mounting seat. A rotating power component 13, which is a servo motor, is fixed on the mounting seat.

[0061] The top of the adjusting shaft 14 extends upward beyond the working disk 2 and is connected to a power transmission part 141. The rotating power component 13 has a clutch part 131 for engaging or disengaging with the power transmission part 141. A transmission mechanism 15 is provided between the portion of the adjusting shaft 14 extending beyond 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 to the adjusting shaft 14, and the second bevel gear 152 is coaxially fixed to the transmission shaft 153. The transmission shaft 153 is rotatably mounted on two spaced-apart support seats via bearings, and the support seats are fixed to the working disk 2. During the downward extension of the lifting cylinder 12, the clutch 131 and the power transmission part 141 engage. This engagement is a plug-in fit, and after engagement, there is no relative rotation between them. At this time, as the working disc 2 rotates, it drives the adjusting shaft 14 to rotate via a bevel gear mechanism, thereby raising and lowering the intermediate disc 38 via the threaded sleeve 39. During the upward retraction of the lifting cylinder 12, the power transmission part 141 disengages from the clutch 131. At this time, the working disc 2, the intermediate disc 38, and the indexing disc 41 form a single unit and rotate synchronously.

[0062] In this embodiment, as Figure 13 As 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 clamping guide seat 35.

[0063] Specifically, the base 31 has a split structure, such as... Figure 15 As shown, the device comprises a bottom base 311, a raised block 312, and a mounting block 313, arranged sequentially from bottom to top. The bottom base 311 has a positioning mounting groove, into which the raised block 312 is placed. The bottom of the bottom base 311 has a bottom fixing hole through which a bolt for fixing the raised block 312 passes, thus detachably assembling the raised block 312 and the bottom base 311. The raised block 312 has a stepped structure with a sliding mounting opening on one side, into which the mounting block 313 is inserted. The raised block 312 has a side fixing hole on the side facing away from the sliding mounting opening, into which a bolt for fixing the mounting block 313 passes, thus detachably assembling the mounting block 313 and the raised block 312.

[0064] The bottom base 311, the shim block 312, and the mounting block 313 all have through-holes 314 on the same side, allowing the piston rod to be inserted or removed from the side of the base 31. When the aforementioned bolts are removed, the shim block 312 can slide laterally out of the bottom base 311, and the mounting block 313 can slide laterally out of the shim block 312.

[0065] The stop ring positioning seat 32 is disposed in the lateral opening 314 and assembled within the mounting block 313. The mounting block 313 has an mounting groove 3131 adapted to the stop ring positioning seat 32, and the bottom of the mounting groove 3131 is used to stop the stop ring positioning seat 32 in the vertical direction. The stop ring positioning seat 32 can be quickly positioned and assembled within the mounting block 313 via the mounting groove 3131. The stop ring positioning seat 32 has a lateral opening 321, which is U-shaped and faces the same direction as the lateral opening 314, and is vertically connected to 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 to stop the stop ring. The piston rod can be inserted into the side opening 321 through the side opening 314. The stop ring 10 is sleeved on the piston rod 11 and slides down to the aforementioned stop positioning surface, thereby positioning the stop ring 10. It should be noted that the diameter of the side opening 321 is larger than the diameter of the part of the piston rod 11 that is inserted.

[0066] The stop ring positioning seat 32 is provided with a guide groove 322 extending in the vertical direction, and 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 provided in the guide hole 3132 to ensure that the side opening 321 on the stop ring positioning seat 32 is oriented accurately when it is installed.

[0067] like Figure 13 As shown, the spring limiting mechanism 33 is located 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. Figure 16As shown, each spring includes a mounting part 331 and a main body 332. The mounting part 331 is rotatably assembled with the bottom seat 311 via a rotating shaft 3312. A short shaft 3311 is also provided on the mounting part 331, with its axis perpendicular to the axis of the rotating shaft 3312. A spring 333 is sleeved on the two short shafts 3311, and its two ends are fixed to the two mounting parts 331 respectively. The main body 332 is detachably fixed to the mounting part 331 by bolts. The main body 332 is provided with a V-shaped limiting surface 3321 and a guide slope 3322. In its natural state, the spring 333 forms a limiting opening 3323 between the two V-shaped limiting surfaces 3321, which is vertically opposite to the side opening 321. The limiting opening 3323 can straighten the piston rod 11, keeping it centered and preventing it from tilting during the rotation of the working disc 2. A guide opening 3324 is formed between the two guide ramps 3322. The distance between the guide ramps 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 toward the direction closer to the lateral opening 314. The minimum diameter of the guide opening 3324 is smaller than the diameter of the portion of the piston rod 11 that is inserted into the lateral opening 321.

[0068] The piston rod positioning seat 34 is located below the spring limiting mechanism 33 and is arranged in a one-to-one correspondence with the base 31. A support 37 is provided on the intermediate plate 38 corresponding to the position of each piston rod positioning seat 34. Figure 14 As shown, the piston rod positioning seat 34 is T-shaped, including a large-diameter section at the top and a small-diameter section at the bottom. The small-diameter section passes downward through the support 37, and the large-diameter section is in a stop-fitting relationship with the support 37 in the vertical direction. Piston rod positioning grooves 342, which are vertically connected, are provided on both the large-diameter and small-diameter sections for the piston rod 11 to be inserted. A bushing 341 is coaxially provided inside the large-diameter section, and the bushing 341 has an insertion hole for the piston rod 11 to be inserted.

[0069] like Figure 13 As shown, the clamping guide seat 35 is located below the piston rod positioning seat 34 and between the intermediate plate 38 and the indexing plate 41. The two are connected to the base 31 by multiple connecting rods 36. The clamping guide seat 35 has a through hole 351 coaxial with the piston rod positioning groove 342. The lower end of the piston rod 11 is inserted into the above-mentioned through hole and extends into the piston rod positioning groove 342.

[0070] like Figure 2 and Figure 5As shown, the clamping mechanism is positioned corresponding to the welding mechanism and includes a lowering mechanism 8 and an upper pressing mechanism 9. The lowering mechanism 8 is mounted on the welding frame 51 and is used to press the stop ring and piston rod downwards. The upper pressing mechanism 9 is vertically opposite to the lowering mechanism 8, and the output end of the upper pressing mechanism 9 is used to pass through the through hole 351 on the corresponding pressing guide seat 35 to press the piston rod positioning seat 34 upwards. Since the piston rod positioning seat 34 is stopped by the step at the bottom of the piston rod 11, when the height of the intermediate plate 38 is adjusted, the height of the piston rod positioning seat 34 is also adjusted synchronously, at which time the welding position of the stop ring 10 on the piston rod 11 can be adjusted.

[0071] In this embodiment, the pressing mechanism 8 includes a pressing cylinder 81 and a pressing block 82 connected to the power output end of the pressing cylinder 81, such as... Figure 12 As shown, the center of the pressure block 82 is provided with a positioning hole 822 that matches the top of the piston rod 11, and multiple pressure claws 821 for pressing the stop ring are arranged around the positioning hole 822 on the pressure block 82. Figure 5 As shown, the upper lifting mechanism 9 is a servo electric cylinder. The output rod of the servo electric cylinder passes through the through hole 351 to push the piston rod positioning seat 34 upward. Under the pushing action of the servo electric cylinder, the piston rod positioning seat 34 can move up and down until it is pressed tightly against the piston rod positioning seat 34. The function of the servo electric cylinder is to ensure the accurate spot welding position of the stop ring 10.

[0072] like Figure 2 and Figure 3 As shown, the inspection mechanism includes a pre-weld inspection mechanism 6 and a post-weld inspection mechanism 7, which are located on the front and rear sides of the welding mechanism. The pre-weld inspection mechanism 6 is used to inspect the length of the piston rod and the placement direction of the piston rod 11 and the stop ring 10; the post-weld inspection mechanism 7 is used to inspect the welding position of the stop ring 10. Specifically, the pre-weld inspection mechanism 6 has two parts: a length inspection mechanism 61 and a direction inspection mechanism 62.

[0073] Specifically, such 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 inserted from the feed port 3324 into the limiting port 3323 and the side opening, the working disc 2 rotates to move the newly placed piston rod 11 and the stop ring 10 to the first detection cylinder 612. At this time, the first detection cylinder 612 extends downwards and can press down on the top of the piston rod 11 through the first pressing member 613, so that the lower end of the piston rod 11 is stably inserted into the piston rod positioning seat 34. A first displacement sensor is installed inside the first detection cylinder 612 to detect the stroke of the first detection cylinder 612, which is also the 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 fed 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 piston rod 11 being fed does not meet the requirements, and an alarm will be triggered to prompt the worker to replace the piston rod 11.

[0074] The orientation detection mechanism 62 uses a vision inspection camera, and the vision inspection motor is fixed to the welding frame 51 by a bracket. By taking pictures, the vision inspection camera can detect whether the upper and lower ends of the piston rod 11 are reversed and whether the stop ring 10 is reversed.

[0075] like Figure 18As shown, the post-weld 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 component 74. The second inspection cylinder 73 is used to drive the second pressing component 74 to move up and down. The second inspection frame 71 is provided with a guide rail to ensure the straightness of the movement of the second pressing component 74. The second pressing component 74 is provided with an inspection hole adapted to the top of the piston rod 11. The inspection hole is a stepped hole. When the second pressing component 74 moves downward into place, the step at the top of the piston rod 11 is exactly in the inspection hole, and the second pressing component 74 and the piston rod 11 are in a stop-fitting engagement in the vertical direction. A second displacement sensor for detecting the movement stroke of the second pressing component 74 is installed in the second inspection cylinder 73. After the piston rod 11 and the stop ring 10 are welded together, and the piston rod is rotated by the working plate 2 to the post-weld inspection mechanism 7, the output rod of the lifting cylinder 72 passes through the through hole 351 on the clamping guide seat 35, lifting the piston rod positioning seat 34 upwards to ensure that the bottom end of the piston rod at each loading station rotated to the post-weld inspection mechanism 7 is at the same height. The second inspection cylinder 73 extends downwards, driving the second pressing component 74 to press down 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 determined 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 determined that the welding position of the stop ring 10 is too high or too low, and an alarm will be triggered to prompt the worker to remove and classify the defective products.

[0076] In this embodiment, both the first and second displacement sensors are magnetostrictive displacement sensors. Magnetostrictive displacement sensors are existing technology and will not be described in detail here.

[0077] The working process of the shock absorber piston rod stop ring spot welding device of this utility model is as follows:

[0078] 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. The cam-type divider is activated, and the working plate 2 rotates 60° each time. The operator loads each loading station one by one. After being positioned, the piston rod 11 and the stop ring 10 pass through the length detection mechanism 61, the direction detection mechanism 62, the multi-point welding mechanism 5, and the post-weld inspection mechanism 7 in sequence, and finally return to the loading port. The operator then takes out the welded piston rod and stop ring one by one.

[0079] This utility model adopts an integrated damper piston rod stop ring spot welding device, which has a compact structure, small space occupation, high safety, can realize continuous welding production operation, improve welding efficiency, and at the same time ensure welding quality.

[0080] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0081] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

[0082] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A spot welding device for the piston rod stop ring of a shock absorber, characterized in that, It includes a cabinet and a worktable, stepper drive mechanism, positioning mechanism, clamping mechanism, multi-point welding mechanism, and detection mechanism housed within the cabinet. The cabinet has a loading port. The working plate is provided with multiple feeding stations evenly distributed in a circle. Each feeding station is equipped with the positioning mechanism, which is used to position the piston rod and the stop ring. The stepper drive mechanism is connected to the working disc drive and is used to drive the working disc to rotate in a stepping manner so that the loading station rotates to the welding mechanism one by one. The clamping mechanism is located at the multi-point welding mechanism and is used to clamp the piston rod and the stop ring that have rotated to the loading station at the multi-point welding mechanism. The multi-point welding mechanism is used to perform multi-point welding on the piston rod and stop ring after they have been positioned at the loading station. The inspection mechanism includes a pre-welding inspection mechanism and a post-welding inspection mechanism located on the front and rear sides of the welding mechanism. The pre-welding inspection mechanism is used to inspect the length of the piston rod and the placement direction of the piston rod and the stop ring; the post-welding inspection mechanism is used to inspect the welding position of the stop ring.

2. The damper 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 around the circumference, each welding unit including 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. The spot welding electrode has a flat welding head.

3. The damper piston rod stop ring spot welding device according to claim 2, characterized in that, The clamping mechanism includes a downward pressing mechanism and an upward pressing mechanism arranged opposite to each other. The downward pressing mechanism is mounted on the welding frame and is used to press the stop ring and piston rod downward, while the upward pressing mechanism is used to press the piston rod positioning seat upward.

4. The damper 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. The base has a lateral opening extending vertically. The stop ring positioning seat is located within the lateral opening and has a lateral opening and a stop positioning surface. The stop positioning surface is located above the lateral opening and is used to engage with the stop ring. The lateral opening is vertically connected to the lateral opening, and the diameter of the lateral opening is not greater than the minimum diameter of the lateral opening, allowing the piston rod to be inserted and removed radially. The spring limiting mechanism includes two pawls and a spring connected to the same end of the two pawls. Each pawl is rotatably assembled with the base. In its natural state, the spring forms a guide opening and a limiting opening between the two pawls. The limiting opening is vertically opposite to the lateral opening, and the piston rod is inserted into the lateral opening and the limiting opening through the guide opening. The piston rod positioning seat has a piston rod positioning groove for insertion, and the top of the piston rod positioning seat engages with a step on the piston rod for stop engagement.

5. The damper piston rod stop ring spot welding device according to claim 4, characterized in that, The spring claw includes a detachably connected main body and a mounting part, with the limiting port and guide port formed between the two main bodies; the stop ring mounting seat is detachably connected to the base.

6. The damper piston rod stop ring spot welding device according to claim 4, characterized in that, The installation height of the piston rod positioning seat is adjustable.

7. The damper piston rod stop ring spot welding device according to claim 6, characterized in that, The stepper drive mechanism includes an indexing plate capable of intermittent indexing motion. The indexing plate and the working plate are fixedly connected by multiple columns. An adjusting plate, which slides and guides each column, is provided parallel to the indexing plate and the working plate. A piston rod positioning seat is mounted on the adjusting plate. An adjusting shaft is coaxially mounted between the working plate and the indexing plate and is threadedly connected to the adjusting plate. A power transmission part is connected to the top of the adjusting shaft. A rotating power component capable of lifting and lowering is provided inside the cabinet. The rotating power component has a clutch part for engaging or disengaging with the power transmission part. A transmission mechanism is provided between the portion of the adjusting shaft extending out of the working plate and the working plate. When the power transmission part and the clutch part are engaged, the transmission mechanism drives the adjusting shaft to rotate, thereby raising and lowering the adjusting plate.

8. The damper 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 adjusting shaft, and the second bevel gear is coaxially fixed on the transmission shaft. The transmission shaft is rotatably mounted on the working plate via a support base.

9. The damper piston rod stop ring spot welding device according to claim 1, characterized in that, The pre-welding inspection mechanism includes a length inspection mechanism and a direction inspection mechanism. The length inspection mechanism includes a first inspection cylinder located inside the cabinet and a first pressure member connected to the output end of the first inspection cylinder. The first pressure member is used to press down the piston rod. A first displacement sensor is installed inside the first inspection cylinder to detect the movement stroke of the first pressure member. The direction inspection mechanism includes a visual inspection camera.

10. The damper piston rod stop ring spot welding device according to claim 9, characterized in that, The post-weld inspection mechanism includes a lifting cylinder, a second inspection cylinder, and a second pressure component. The output end of the lifting cylinder is used to lift the piston rod positioning seat so that the piston rod positioning seat is held at a set height. The second inspection cylinder is used to drive the second pressure component to move up and down. A second displacement sensor for detecting the movement stroke of the second pressure component is installed inside the second inspection cylinder. The second pressure component is provided with an inspection hole that matches the top of the piston rod.

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