Nut welding positioning device

Abstract

The utility model provides a nut welding positioning device. The nut welding positioning device comprises an electrode holder, an electrode upper cover and a positioning piece, the positioning piece comprises a center rod, a bearing piece, a limiting cap and a plurality of positioning rings. The bottom end of the center rod is connected with the electrode base, and the bearing piece is arranged in the containing through hole in a lifting mode. The limiting cap is detachably arranged at the top end, extending out of the electrode upper cover, of the center rod; and the plurality of positioning rings are detachably sleeved on the central rod between the bearing piece and the limiting cap. According to the utility model, the plurality of positioning rings are sleeved on the central rod, and the bearing piece and the limiting cap are used for limiting, so that the positioning ring at the uppermost end extends out of the electrode upper cover, and only the positioning ring at the uppermost end is abraded in the use process, and the abraded positioning ring is directly disassembled, so that the positioning ring is not damaged. The bearing piece can jack up the positioning ring which is not abraded and put into use, the service life of the positioning piece is prolonged, the cost is saved, the time for replacing the positioning piece is shortened, the welding efficiency is improved, and the welding accuracy can be kept for a long time.

Description

Technical Field

[0001] This utility model belongs to the field of nut projection welding, and in particular relates to a nut welding positioning device. Background Technology

[0002] Nut projection welding is a welding technique in which the upper electrode presses the nut to be welded downwards onto the workpiece, and the nut, workpiece and lower electrode are connected by electricity. The heat generated by the current is used to weld the nut to the surface of the workpiece, which can effectively improve the welding efficiency of nuts.

[0003] During projection welding of nuts, a positioning device is needed to coaxially position the nut and the pre-set positioning hole on the workpiece to ensure the accuracy of the welding and to align the screw hole of the nut with the positioning hole on the workpiece. Specifically, the workpiece is first placed onto the positioning device through the positioning hole, then the nut is placed on the positioning device. The protrusion shape of the positioning device aligns the axis of the nut with the axis of the positioning hole. The upper electrode then moves downwards, pressing the nut onto the surface of the workpiece, and finally, welding is performed by applying current.

[0004] To ensure welding accuracy, the outer diameter of the locating element at the bottom of the nut is almost the same as the inner diameter of the nut. During welding, as the nut is pressed down, it repeatedly rubs against the inclined top surface and sidewalls of the locating element. After a period of time, the locating element will wear down and become unable to accurately position the nut, resulting in misaligned welding. Replacing the locating element directly would not only waste costs but also reduce the efficiency of nut welding. Utility Model Content

[0005] In view of this, the present invention aims to provide a nut welding positioning device to position the nut during the projection welding of the nut and can cope with the wear of the nut on the positioning part for a long time.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A nut welding positioning device includes: an electrode base, an electrode cover, and a positioning component; the electrode cover is disposed at the top of the electrode base, and the top surface of the electrode cover is provided with a receiving through hole for accommodating the positioning component.

[0008] The positioning component includes: a central rod, a carrier, a limiting cap, and multiple positioning rings; the bottom end of the central rod is fixedly connected to the electrode seat, and the top end of the central rod extends outward from the electrode cover along the receiving through hole; the carrier is vertically and detachably disposed inside the receiving through hole; the limiting cap is detachably disposed at the top end of the central rod; the multiple positioning rings are detachably fitted onto the central rod between the carrier and the limiting cap, with the bottom surface of the lowest positioning ring contacting the top surface of the carrier, and the top surface of the highest positioning ring contacting the bottom surface of the limiting cap; the top surface of the positioning ring is a guide outer conical surface, and the bottom surface of the positioning ring is a receiving inner conical surface, and the receiving inner conical surface is parallel to the guide outer conical surface; an elastic support is provided at the lower end of the carrier for lifting the carrier upward.

[0009] Furthermore, a guide hole is provided on the top surface of the central rod, and a guide cut is provided on the side wall of the central rod that communicates with the guide hole. The length direction of the guide cut is parallel to the axial direction of the central rod, and the top end of the guide cut extends to the top surface of the central rod.

[0010] Furthermore, the support member includes a guide slider and a support plate, the guide slider being vertically and vertically disposed inside the guide hole; the support plate passes through the guide cut and is connected to the side wall of the guide slider, and the top surface of the support plate is parallel to the inner conical surface of the receiving cavity.

[0011] Furthermore, the inner conical surface of the receiving device is provided with a positioning groove for receiving the support plate, and the outer conical surface of the guide device is provided with a positioning protrusion. When multiple positioning rings are fitted onto the central rod, the positioning protrusion is inserted into the positioning groove of the adjacent positioning ring above.

[0012] Furthermore, the receiving through hole includes a receiving section and a limiting section, the inner diameter of the limiting section is smaller than the inner diameter of the receiving section, and the inner diameter of the limiting section is the same as the outer diameter of the positioning ring.

[0013] Furthermore, the distance from the end of the support plate away from the guide slider to the axis of the central rod is greater than the outer diameter of the positioning ring.

[0014] Furthermore, the limiting cap is threaded to the top of the center rod, and the bottom surface of the limiting cap is provided with an annular receiving groove for accommodating the positioning protrusion.

[0015] Furthermore, there are multiple support plates, and the side wall of the central rod is provided with multiple guide cuts, the same number as the support plates.

[0016] Furthermore, the elastic support is a spring.

[0017] Furthermore, a junction box is provided on the side wall of the electrode cover.

[0018] Compared with the prior art, the nut welding positioning device of this utility model has the following advantages:

[0019] (1) The nut welding positioning device of this utility model uses a central rod set in the receiving through hole of the electrode cover to fit multiple positioning rings. At the same time, the bearing and the limiting cap limit the multiple positioning rings at the bottom and top of the multiple positioning rings respectively. The parallel top and bottom surfaces of the positioning rings facilitate the stable stacking of multiple positioning rings on the central rod. The bearing lifts the multiple positioning rings upward through the elastic support at the lower end. The limiting cap presses down the uppermost positioning ring at the top of the central rod, ensuring that only the uppermost positioning ring extends out of the electrode cover. During use, only the uppermost positioning ring is worn. The worn positioning ring can be directly disassembled, and the bearing can be used to lift up the remaining unworn positioning rings and put them into use. This greatly extends the service life of the positioning components and eliminates the need to replace the entire set of positioning components, saving costs, reducing the time for replacing positioning components, improving welding efficiency, and maintaining the accuracy of nut projection welding for a long time.

[0020] (2) The nut welding positioning device of this utility model fixes the lowermost positioning ring to the support plate by inserting the support plate into the positioning groove of the lowermost positioning ring. The positioning protrusion of the lower positioning ring can extend into the positioning groove of the adjacent positioning ring above, thus fixing the adjacent positioning rings to each other. In this way, multiple positioning rings can be fixed to the support plate, preventing the positioning rings from rotating circumferentially on the central rod. In addition, the positioning ring is further limited by the contact between the limiting section and the positioning ring, which improves the stability of the positioning ring. Even after the positioning ring is lifted by the bearing component to the outside of the electrode cover, it can still remain stable, thus accurately positioning the workpiece to be welded and the nut to be welded. At the same time, the limiting section can block the limiting strip, preventing the support plate from rising to the outside of the electrode cover without restriction, and facilitating the installation of new positioning rings. In addition, the limiting ring is connected to the top of the center rod by a thread, which can more stably press the positioning ring. The annular receiving groove on the bottom surface of the limiting ring can prevent the limiting ring from being obstructed by the positioning protrusion on the guide outer cone surface of the uppermost positioning ring when it is rotated for installation or removal. It can also further limit the positioning ring through the positioning protrusion, making the positioning ring more stable. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a nut welding positioning device according to an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of a nut welding positioning device according to an embodiment of the present utility model;

[0024] Figure 3 This is a top view of the support member described in an embodiment of the present utility model;

[0025] Figure 4 This is a top view of the positioning ring described in an embodiment of the present invention;

[0026] Figure 5 This is a bottom view of the positioning ring described in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Limit cap; 2-Guide outer conical surface; 3-Outer wall of positioning ring; 4-Electrode seat; 5-Electrode top cover; 6-Positioning ring; 7-Positioning protrusion; 8-Positioning groove; 9-Guide slider; 10-Support plate; 11-Limiting strip; 12-Accommodation through hole; 13-Center rod; 14-Spring; 15-Electrical base; 16-Limiting section; 17-Guide cutout; 18-Annular accommodating groove; 19-Guide hole; 20-Accommodation inner conical surface. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] A nut welding positioning device includes: an electrode base 4, an electrode cover 5, and a positioning element; the electrode cover 5 is disposed at the top of the electrode base 4, and the top surface of the electrode cover 5 is provided with a receiving through hole 12 for accommodating the positioning element.

[0034] When performing projection welding on nuts, the workpiece to be welded is usually fixed on the lower electrode of the projection welding machine first. Then, the upper electrode of the projection welding machine presses the nut onto the workpiece. The nut and the workpiece connect the upper and lower electrodes, and the heat generated by the current welds the nut onto the workpiece. During welding, positioning holes need to be pre-made on the workpiece. The workpiece is then fitted onto the positioning piece through the positioning holes, and the nut is then fitted onto the positioning piece before welding. The lower electrode is energized through the electrode cover 5 and supplies current to the workpiece. The electrode cover 5 is connected to the projection welding machine through the electrode holder 4. For example, the side wall of the electrode cover 5 is provided with a power connector 15, which is used to connect to an external power source, thereby energizing the electrode cover 5 and forming a current path of electrode cover 5 - workpiece - nut - upper electrode during welding.

[0035] Since the positioning element is used to fix the workpiece and the nut to be welded onto the electrode cover 5, the positioning element needs to maintain a fixed relative position to the electrode cover 5. In this embodiment, in order to control the wear of the positioning element and facilitate guiding and pressing the nut onto the workpiece, after the electrode base 4, the electrode cover 5, and the positioning element are all installed in place, the upper end of the positioning element is exposed outside the electrode cover 5. This is used to fit the workpiece and the nut to be welded and to position them, so that the nut to be welded can be accurately welded to the required position.

[0036] The positioning component includes: a center rod 13, a bearing component, a limiting cap 1, and multiple positioning rings 6. To ensure more stable fixation of the positioning component, the bottom end of the center rod 13 is fixedly connected to the electrode base 4, and the top end of the center rod 13 extends along the receiving through hole 12 to the outside of the electrode cover 5, allowing the positioning component to extend outside the electrode cover 5. At this time, the bottom end of the positioning component is firmly fixed, facilitating stable positioning of the exposed part outside the electrode cover for the workpiece to be welded and the nut to be welded.

[0037] The carrier is vertically adjustable and installed inside the receiving through hole 12. The limiting cap 1 is detachably installed at the top of the central rod 13. Multiple positioning rings 6 are detachably fitted onto the central rod 13 between the carrier and the limiting cap 1. The bottom surface of the lowest positioning ring 6 contacts the top surface of the carrier, and the top surface of the highest positioning ring 6 contacts the bottom surface of the limiting cap 1. In this embodiment, the carrier lifts the multiple positioning rings 6 upwards, allowing them to rise from the receiving through hole 12 to outside the electrode cover 5, thereby achieving the function of positioning the workpiece and the nut to be welded using the positioning rings 6. The limiting cap 1 is used to limit the height of the multiple positioning rings 6 extending outside the electrode cover 5. In actual use, after the limiting cap 1 is installed at the top of the central rod 13, the carrier lifts the multiple positioning rings 6 upwards until the topmost positioning ring 6 is blocked by the bottom surface of the limiting cap 1. At this time, only the topmost positioning ring 6 extends outside the electrode cover 5, ensuring that only one positioning ring 6 is worn at the same time. It should be noted that the model of the positioning ring 6 is compatible with the model of the nut to be welded. The limiting ring and the bearing component only need to ensure that only the uppermost positioning ring 6 extends out of the electrode cover 5.

[0038] The top surface of the positioning ring 6 is a guide outer conical surface 2, and the bottom surface of the positioning ring 6 is a receiving inner conical surface 20, which is parallel to the guide outer conical surface 2. In actual use, the guide outer conical surface 2 can correct the misplaced nut to be welded during the downward pressing of the upper electrode by its own inclination. Afterward, the upper electrode continues to press the nut to be welded down, and the nut to be welded is further guided downward by the outer wall 3 of the positioning ring until it is crushed onto the workpiece to be welded. In order to facilitate the stable stacking of multiple positioning rings 6 and their fitting onto the central rod 13, the top and bottom surfaces of the positioning ring 6 are set parallel to each other. During the process of correcting the nut to be welded, the guide outer conical surface 2 will rub against the nut to be welded due to the downward pressing of the upper electrode. The outer wall 3 of the positioning ring will also rub against the inner wall of the nut to be welded during the descent of the nut to be welded. After a period of use, the flatness of the guide outer conical surface 2 will be worn down, and the outer diameter of the positioning ring 6 will become smaller due to wear, making it impossible to accurately position the workpiece to be welded and the nut to be welded, resulting in misalignment during welding. The worn positioning ring 6 at the top can be removed by disassembling the limiting cap 1, and then the limiting cap 1 can be reinstalled. At this time, the remaining positioning ring 6 will be lifted upward by the carrier, so that the unworn positioning ring 6 rises again outside the electrode cover 5. An elastic support is provided at the lower end of the carrier for lifting the carrier upward. For example, the elastic support is a spring 14. The top end of the spring 14 contacts the bottom surface of the support, and the bottom end of the spring 14 contacts the top surface of the electrode seat 4 at the bottom opening of the receiving through hole 12. The spring 14 can provide an upward supporting force to the carrier, so that the carrier can lift the positioning ring 6 upward.

[0039] By disassembling the worn locating ring 6 and then using a support component to lift the unworn locating ring 6 for use, the service life of the locating components is greatly extended, the number of times the locating components need to be replaced is reduced, costs are saved, welding efficiency is improved, and the accuracy of the nut projection weld can be maintained for a long time. If all locating rings 6 are worn, multiple new locating rings 6 can be replaced and directly fitted onto the center rod 13, eliminating the cumbersome process of disassembling and assembling the locating components.

[0040] In one optional implementation of this embodiment, to ensure the support member can stably support the lifting of the positioning ring 6, a guide hole 19 is provided on the top surface of the central rod 13. The bottom surface of the guide hole 19 extends to the bottom end of the central rod 13 located inside the receiving through hole 12, and the axial direction of the guide hole 19 is parallel to the axial direction of the central rod 13. A guide cutout 17 communicating with the guide hole 19 is provided on the side wall of the central rod 13, and the length direction of the guide cutout 17 is parallel to the axial direction of the central rod 13. The top end of the guide cutout 17 extends to the top surface of the central rod 13.

[0041] Specifically, the support components include a guide slider 9 and a support plate 10. The guide slider 9 is vertically and vertically disposed inside the guide hole 19. The support plate 10 passes through the guide cutout 17 and is connected to the side wall of the guide slider 9, and the top surface of the support plate 10 is parallel to the inner conical surface 20 of the receiving cavity.

[0042] The guide slider 9 is inserted into the guide hole 19 through the top surface of the center rod 13, and the support plate 10 is simultaneously inserted into the guide cut 17. At this time, the guide slider 9 and the support plate 10 can move up and down simultaneously along the guide hole 19 and the guide cut 17, respectively. The guide hole 19 limits the guide slider 9, allowing the guide slider 9 and the support plate to move up and down stably along the axial direction of the center rod 13 at the same time. The top surface of the support plate 10 can fit against the inner conical surface 20, thereby allowing the support plate 10 to stably lift the positioning ring 6 upward, exposing the uppermost positioning ring 6 outside the electrode cover 5, which is beneficial for the stable positioning of the workpiece and the nut to be welded.

[0043] Optionally, to prevent the positioning ring 6 from rotating during use, the inner conical surface 20 is provided with a positioning groove 8 for accommodating the support plate 10, and the outer conical surface 2 is provided with a positioning protrusion 7. When multiple positioning rings 6 are fitted onto the central rod 13, the positioning protrusion 7 is inserted into the positioning groove 8 of the adjacent positioning ring 6 above.

[0044] Because precise positioning of the workpiece and the nut is required during welding, the outer diameter of the positioning ring 6 is the same as the inner diameter of the nut and the inner diameter of the positioning hole on the workpiece. Therefore, when removing the welded workpiece from the positioning ring 6 after welding, it is necessary to shake or rotate it appropriately. At this time, the positioning ring 6 needs to remain relatively stable and not shake or rotate accordingly. When multiple positioning rings 6 are fitted onto the central rod 13, the inner conical surface 20 of the lowermost positioning ring 6 contacts the top surface of the support plate 10. At this time, the support plate 10 is inserted into the positioning groove 8 on the inner conical surface 20. Since the support plate 10 passes through the guide cut 17 and can only move up and down along the guide cut 17 and cannot rotate around the central rod 13, the lowermost positioning ring 6 is also limited by the support plate 10 and cannot rotate around the central rod 13. After the positioning protrusion 7 on the lowest positioning ring 6 extends into the positioning groove 8 on the adjacent positioning ring 6 above, the lowest positioning ring 6 and the adjacent positioning ring 6 above will also be circumferentially locked. This process continues until the highest positioning ring 6 is also limited by the cooperation between its positioning groove 8 and the positioning protrusion 7 of its adjacent positioning ring 6 below. At this point, all positioning rings 6 are locked to each other through the one-to-one cooperation between the positioning recess and the positioning protrusion 7. All positioning rings 6 are fixed relative to the support plate 10 and will not rotate, so that the positioning rings 6 will not shake or rotate when the welded parts are disassembled.

[0045] Optionally, the receiving through hole 12 includes a receiving section and a limiting section 16. The inner diameter of the limiting section 16 is smaller than the inner diameter of the receiving section, and the inner diameter of the limiting section 16 is the same as the outer diameter of the positioning ring 6.

[0046] To ensure greater stability of the positioning ring 6 when fixing the workpiece and the nut to be welded, the receiving section of the through hole 12 accommodates the carrier and a portion of multiple positioning rings 6. The limiting section 16 further limits the bottom of the positioning ring 6 extending from the electrode cover 5 by contacting the outer wall 3 of the positioning ring, making the positioning ring 6 extending from the electrode cover 5 more stable. Furthermore, depending on the design requirements of different projection welding machines in practical applications, an insulating pad can be provided on the inner wall of the limiting section 16.

[0047] Furthermore, to prevent the support plate 10 from extending beyond the electrode cover 5, the distance from the end of the support plate 10 away from the guide slider 9 to the axis of the central rod 13 is greater than the outer diameter of the positioning ring 6. A limiting strip 11 extending beyond the positioning ring 6 is provided at the end of the support plate 10 away from the guide slider 9. The outer diameter of the limiting strip 11 is greater than the outer diameter of the positioning ring 6. Since the inner diameter of the limiting section 16 is smaller than the outer diameter of the receiving section, the support plate 10 will be unable to continue rising during its ascent because the limiting strip 11 is blocked by the limiting section 16, thus preventing it from moving beyond the electrode cover 5. This ensures that the support plate 10 will not rise indefinitely after all positioning rings 6 have been removed, facilitating the insertion of new positioning rings 6. When multiple positioning rings 6 in the current batch are worn and need replacement, multiple positioning rings 6 from a new batch can be directly fitted onto the central rod 13, improving the replacement efficiency of the positioning rings 6. In addition, depending on the design requirements of different projection welding machine models in actual applications, an insulating pad can also be provided at the end of the support plate 10 away from the guide slider 9.

[0048] Optionally, the limiting cap 1 is threaded to the top of the center rod 13, and the bottom surface of the limiting cap 1 is provided with an annular receiving groove 18 for accommodating the positioning protrusion 7.

[0049] To facilitate the disassembly or replacement of the positioning ring 6, an external thread is provided at the top of the center rod 13, and an internal thread is provided on the inner wall of the limiting cap 1. The limiting cap 1 is detachably connected to the top of the center rod 13 through the engagement of the external and internal threads. When the limiting cap 1 is tightened to the top of the center rod 13 through the thread engagement, it can be firmly fixed to prevent the positioning ring 6 from shifting and to ensure the positioning accuracy of the positioning ring 6 for the workpiece and the nut to be welded. The top surface of the limiting cap 1 is an arc surface, and the side wall of the limiting cap 1 is an outer conical surface. However, the maximum outer diameter of the limiting cap 1 is still smaller than the outer diameter of the positioning ring 6, which makes it convenient to put the nut to be welded in, and at the same time will not block the guide outer conical surface 2 from guiding the nut to be welded. To better maintain the stability of the positioning ring 6, the bottom surface of the limiting cap 1 is a limiting inner conical surface that can cooperate with the guide outer conical surface 2 of the positioning ring 6. Since the limiting cap 1 needs to be tightened when installed at the top of the center rod 13, to avoid the positioning protrusion 7 on the guide outer conical surface 2 from obstructing the tightening process, an annular receiving groove 18 is provided on the limiting inner conical surface to accommodate the positioning protrusion 7. When the limiting cap 1 presses against the guide outer conical surface 2 of the topmost positioning ring 6 and tightens it at the top of the center rod 13, the positioning protrusion 7 extends into the annular receiving groove 18 and slides within the annular receiving groove 18 until the limiting cap 1 is tightened. After the limiting cap 1 is tightened, the annular receiving groove 18 can still limit the positioning protrusion 7, further improving the stability of the positioning ring 6. It should be noted that after the limit cap 1 is installed and tightened on the top of the center rod 13, the bearing will lift up multiple positioning rings 6 until the guide outer cone surface 2 of the uppermost positioning ring 6 abuts against the inner cone surface of the limit. At this time, only the uppermost positioning ring 6 extends out of the electrode cover 5, ensuring that only the uppermost positioning ring 6 will wear during use.

[0050] In one optional implementation of this embodiment, there are multiple support plates 10, and the side wall of the central rod 13 is provided with multiple guide cuts 17, the same number as the support plates 10.

[0051] To improve the load-bearing stability of the multiple positioning rings 6, multiple support plates 10 are radially and evenly arranged around the guide slider 9. The corresponding center rod 13 also has the same number of guide cuts 17 on its sidewall to guide the multiple support plates 10. At the same time, the inner conical surface 20 of the positioning ring 6 is also provided with the same number of positioning grooves 8 as the support plates 10. Each positioning groove 8 on the inner conical surface 20 of the lowest positioning ring 6 accommodates one support plate 10. The positioning protrusions 7 on the outer conical surface 2 of the positioning ring 6 can also be set to the same number as the positioning grooves 8, which greatly improves the fixing effect between the multiple positioning rings 6 and the support plates 10 and can effectively prevent the positioning rings 6 from rotating.

[0052] This invention features a central rod installed in the receiving through-hole of the electrode cover, with multiple positioning rings mounted on the central rod. A support member and a limiting cap lift the positioning rings outside the electrode cover, ensuring that only the uppermost positioning ring extends beyond the cover. During use, only the uppermost positioning ring experiences wear. By removing the detachable limiting cap, the worn uppermost positioning ring can be directly disassembled. The support member then lifts the remaining positioning rings. After reinstalling the limiting cap, the workpiece and nut to be welded can continue to be positioned without replacing the entire positioning system, saving costs, reducing the time spent replacing positioning components, and improving welding efficiency.

[0053] The above description is only a preferred embodiment of the present utility model and is 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 should be included within the protection scope of the present utility model.

Claims

1. A nut welding positioning device, characterized by, The utility model relates to an electrode holder, which comprises an electrode base (4), an electrode cover (5) and a positioning member; the electrode cover (5) is arranged at the top end of the electrode base (4), and the top surface of the electrode cover (5) is provided with a containing through hole (12) for accommodating the positioning member; The positioning member comprises a center rod (13), a bearing member, a limiting cap (1) and a plurality of positioning rings (6); the bottom end of the center rod (13) is fixedly connected with the electrode base (4), and the top end of the center rod (13) extends to the outside of the electrode cover (5) along the containing through hole (12); the bearing member is arranged inside the containing through hole (12) in a liftable manner; the limiting cap (1) is detachably arranged at the top end of the center rod (13); the plurality of positioning rings (6) are detachably sleeved on the center rod (13) between the bearing member and the limiting cap (1), the bottom surface of the lowermost positioning ring (6) is in contact with the top surface of the bearing member, and the top surface of the uppermost positioning ring (6) is in contact with the bottom surface of the limiting cap (1); the top surface of the positioning ring (6) is a guide outer conical surface (2), the bottom surface of the positioning ring (6) is a containing inner conical surface (20), and the containing inner conical surface (20) is parallel to the guide outer conical surface (2); an elastic supporting member for lifting the bearing member upward is arranged at the lower end of the bearing member. A guide hole (19) is arranged on the top surface of the center rod (13), a guide cutout (17) in communication with the guide hole (19) is arranged on the side wall of the center rod (13), the length direction of the guide cutout (17) is parallel to the axial direction of the center rod (13), and the top end of the guide cutout (17) extends to the top surface of the center rod (13).

2. A nut welding positioning device according to claim 1, characterized in that: The bearing member comprises a guide sliding block (9) and a supporting plate (10); the guide sliding block (9) is arranged inside the guide hole (19) in a liftable manner; the supporting plate (10) passes through the guide cutout (17) and is connected with the side wall of the guide sliding block (9), and the top surface of the supporting plate (10) is parallel to the containing inner conical surface (20).

3. A nut welding positioning device according to claim 2, characterized in that: A positioning groove (8) for accommodating the supporting plate (10) is arranged on the containing inner conical surface (20), and a positioning protrusion (7) is arranged on the guide outer conical surface (2); when the plurality of positioning rings (6) are sleeved on the center rod (13), the positioning protrusion (7) is inserted into the positioning groove (8) of the adjacent positioning ring (6) above.

4. A nut welding positioning device according to claim 3, characterized in that: The containing through hole (12) comprises a containing section and a limiting section (16); the inner diameter of the limiting section (16) is smaller than that of the containing section, and the inner diameter of the limiting section (16) is the same as the outer diameter of the positioning ring (6).

5. The nut welding positioning device of claim 1, wherein: The distance from the end of the supporting plate (10) away from the guide sliding block (9) to the axis of the center rod (13) is greater than the outer diameter of the positioning ring (6).

6. A nut welding positioning device according to claim 3, characterized in that: The limiting cap (1) is threadedly connected with the top end of the center rod (13), and the bottom surface of the limiting cap is provided with an annular containing groove (18) for accommodating the positioning protrusion (7).

7. A nut welding positioning device according to claim 4, characterized in that: There are a plurality of supporting plates (10), and the same number of guide cutouts (17) as the number of the supporting plates (10) are arranged on the side wall of the center rod (13).

8. A nut welding positioning device according to claim 3, characterized in that: The elastic supporting member is a spring (14).

9. The nut welding positioning device of claim 1, wherein: An electricity receiving seat (15) is arranged on the side wall of the electrode cover (5).

10. The nut welding positioning device of claim 1, wherein: ​

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