A projection welding machine positioning mechanism

Abstract

The utility model discloses a kind of positioning mechanisms for projection welding of projection welding machine, belong to the technical field of projection welding machine, including base, the top end of base is fixedly connected with the connecting seat of inverted L shape, the inner top wall of connecting seat is fixedly connected with first hydraulic rod, the bottom of first hydraulic rod is fixedly connected with connecting disc, the bottom middle part of connecting disc is fixedly connected with second hydraulic rod.The utility model is positioned to the nut placed on workpiece mounting hole by positioning sleeve, the section of opening groove on positioning sleeve is inverted funnel shape, can make the position of nut gradually move to the position of coinciding with the central axis of mounting column, the position of nut is positioned more accurately, then, second hydraulic rod works and drives projection welding head to move downward and weld, simultaneously by transmission mechanism, positioning sleeve can be driven to move upward and away from nut, avoid that positioning sleeve and nut occur adhesion when welding, the device realizes positioning function while improving welding effect.

Description

Technical Field

[0001] This utility model relates to the field of projection welding machine technology, specifically a positioning mechanism for projection welding in a projection welding machine. Background Technology

[0002] The projection welding machine is a device with pneumatic pressurization as its core technology. It adopts a bearing-guided structure and consists of a machine body, welding transformer, pressure transmission device and microcomputer controller. It has the capability of single-cycle multi-point welding. It uses flat electrode and T-groove structure to be installed with bolts. It uses vertical pressurization to achieve precise welding with current concentrated on the projection point. It has the characteristics of precise weld point control and good electrode follow-up.

[0003] In practical use, existing projection welding machines typically place the workpiece's mounting hole onto a mounting post, and then place the nut to be welded onto the workpiece's mounting hole for projection welding. During projection welding, the nut is placed manually, which makes its placement inaccurate and the center point difficult to align. This results in an unsightly overall appearance after projection welding and can affect the accuracy of subsequent processing, making it inconvenient to use. Therefore, there is an urgent need to improve the technology of projection welding machine structure to perfect this equipment. Utility Model Content

[0004] The purpose of this invention is to provide a positioning mechanism for projection welding in a projection welding machine. A positioning sleeve positions a nut placed in the workpiece mounting hole. The opening groove on the positioning sleeve has an inverted funnel-shaped cross-section, allowing the nut to gradually move to a position coinciding with the central axis of the mounting column, thus achieving more accurate positioning of the nut. Then, a second hydraulic rod operates, driving the projection welding head downwards for welding. Simultaneously, a transmission mechanism drives the positioning sleeve upwards away from the nut. This device achieves positioning while improving welding efficiency, thus solving the problems currently found in the market as described in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a positioning mechanism for projection welding in a projection welding machine, comprising a base, an inverted L-shaped connecting seat fixedly connected to the top of the base, a first hydraulic rod fixedly connected to the inner top wall of the connecting seat, a connecting plate fixedly connected to the bottom end of the first hydraulic rod, a second hydraulic rod fixedly connected to the middle of the bottom end of the connecting plate, a projection welding head fixedly connected to the bottom end of the second hydraulic rod, a mounting column fixedly connected to the worktable at the top of the base corresponding to the position of the projection welding head, an mounting sleeve provided on the outside of the projection welding head, the outside of the projection welding head being driven by a transmission mechanism to move the mounting sleeve longitudinally, a positioning sleeve being threadedly connected inside the mounting sleeve, an opening groove being provided in the middle of the bottom end of the positioning sleeve, the positioning sleeve being sleeved on the outside of the projection welding head and forming a sliding connection with the projection welding head, and the outside of the positioning sleeve being filtered by a protective mechanism.

[0006] Preferably, the left and right ends of the projection welding head are connected to a first toothed plate, the other end of the first toothed plate is meshed with a cylindrical gear, the bottom end of the connecting plate is fixedly connected to a support frame, the cylindrical gear is rotatably connected to the support frame, the end of the cylindrical gear away from the first toothed plate is meshed with a second toothed plate, the top end of the second toothed plate is fixedly connected to a guide post, the guide post passes through the entire connecting plate and is slidably connected to the connecting plate, and a tension spring is fixedly connected between the connecting plate and the second toothed plate.

[0007] Preferably, the tension spring is wound around the outside of the guide post, and the inner diameter of the tension spring is larger than the outer diameter of the guide post.

[0008] Preferably, the cross-section of the opening groove on the positioning sleeve is an inverted funnel shape, and the minimum internal dimension of the opening groove on the positioning sleeve matches the external dimension of the nut to be assembled.

[0009] Preferably, the outer end of the positioning sleeve is provided with a sliding groove, a filter cover is slidably connected inside the sliding groove, and a compression spring is fixedly connected between the filter cover and the inner top wall of the sliding groove.

[0010] Preferably, the cross-section of the groove is annular, and a polished layer is provided at the contact point between the groove and the filter cover.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention uses a positioning sleeve to align the workpiece's mounting hole with the mounting post. A first hydraulic rod then moves the positioning sleeve and the welding head downwards together, positioning the nut placed in the workpiece's mounting hole. The positioning sleeve has an inverted funnel-shaped opening, allowing the nut to gradually move to a position coinciding with the central axis of the mounting post, ensuring accurate nut positioning. Next, a second hydraulic rod moves the welding head downwards for welding, while a transmission mechanism moves the positioning sleeve upwards away from the nut, preventing adhesion between the positioning sleeve and the nut during welding. This device achieves positioning while improving welding quality and is convenient to use.

[0012] This utility model, by setting a filter cover, allows the welding head to move downwards for welding via the second hydraulic rod, while the positioning sleeve moves upwards via the transmission mechanism. The filter cover, through an elastic connection with a compression spring, can hold the workpiece in place. The filter cover can cover the contact area between the welding head and the nut, filtering the light emitted by the welding head during operation and protecting the operator's eyes. This improves safety and effectiveness to a certain extent. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of the mounting sleeve and positioning sleeve of this utility model; Figure 3 This utility model Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This utility model Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0014] In the diagram: 1. Base; 2. Connecting seat; 3. First hydraulic rod; 4. Connecting plate; 5. Second hydraulic rod; 6. Projection weld head; 7. Mounting post; 8. First toothed plate; 9. Cylindrical gear; 10. Support frame; 11. Second toothed plate; 12. Guide post; 13. Tension spring; 14. Mounting sleeve; 15. Positioning sleeve; 16. Opening slot; 17. Slide groove; 18. Filter cover; 19. Compression spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1 to 4 This utility model provides a technical solution: a positioning mechanism for projection welding in a projection welding machine, including a base 1, an inverted L-shaped connecting seat 2 fixedly connected to the top of the base 1, a first hydraulic rod 3 fixedly connected to the inner top wall of the connecting seat 2, a connecting plate 4 fixedly connected to the bottom end of the first hydraulic rod 3, a second hydraulic rod 5 fixedly connected to the middle of the bottom end of the connecting plate 4, a projection welding head 6 fixedly connected to the bottom end of the second hydraulic rod 5, a mounting column 7 fixedly connected to the worktable at the top of the base 1 corresponding to the position of the projection welding head 6, an mounting sleeve 14 provided on the outside of the projection welding head 6, the outside of the projection welding head 6 being driven by a transmission mechanism to move the mounting sleeve 14 longitudinally, a positioning sleeve 15 being threadedly connected inside the mounting sleeve 14, an opening groove 16 being opened in the middle of the bottom end of the positioning sleeve 15, the positioning sleeve 15 being sleeved on the outside of the projection welding head 6 and forming a sliding connection with the projection welding head 6, and the outside of the positioning sleeve 15 being filtered by a protective mechanism.

[0017] By setting the positioning sleeve 15, the mounting hole of the workpiece is fitted onto the mounting column 7. Then, the first hydraulic rod 3 drives the positioning sleeve 15 and the welding head 6 to move downward together. The positioning sleeve 15 positions the nut placed on the mounting hole of the workpiece. The cross-section of the slot 16 on the positioning sleeve 15 is an inverted funnel shape, which allows the position of the nut to gradually move to a position that coincides with the central axis of the mounting column 7, thus accurately positioning the nut. Afterward, the second hydraulic rod 5 works to drive the welding head 6 to move downward for welding. At the same time, the transmission mechanism can drive the positioning sleeve 15 to move upward away from the nut, avoiding the positioning sleeve 15 from sticking to the nut during welding. This device achieves the positioning function while improving the welding effect and is convenient to use.

[0018] Please see Figures 1 to 3 The left and right ends of the projection welding head 6 are connected to the first toothed plate 8. The other end of the first toothed plate 8 is meshed with the cylindrical gear 9. The bottom end of the connecting plate 4 is fixedly connected to the support frame 10. The cylindrical gear 9 and the support frame 10 are rotatably connected. The end of the cylindrical gear 9 away from the first toothed plate 8 is meshed with the second toothed plate 11. The top end of the second toothed plate 11 is fixedly connected to the guide post 12. The guide post 12 passes through the entire connecting plate 4 and is slidably connected to the connecting plate 4. A tension spring 13 is fixedly connected between the connecting plate 4 and the second toothed plate 11. The tension spring 13 is wrapped around the outside of the guide post 12. The inner diameter of the tension spring 13 is larger than the outer diameter of the guide post 12. By wrapping the tension spring 13 around the outside of the guide post 12, the tension direction of the tension spring 13 can be limited when the guide post 12 moves up and down, so as to prevent the tension spring 13 from being too twisted during stretching and affecting the use effect.

[0019] Please see Figure 2 and Figure 4 The opening groove 16 on the positioning sleeve 15 has an inverted funnel-shaped cross section. The minimum internal dimension of the opening groove 16 on the positioning sleeve 15 matches the external dimension of the nut to be assembled. A sliding groove 17 is provided at the outer end of the positioning sleeve 15. A filter cover 18 is slidably connected inside the sliding groove 17. A compression spring 19 is fixedly connected between the filter cover 18 and the inner top wall of the sliding groove 17. The cross section of the sliding groove 17 is annular. A polished layer is provided at the contact point between the sliding groove 17 and the filter cover 18. By making the cross section of the sliding groove 17 annular, the annular filter cover 18 can slide longitudinally at the outer end of the positioning sleeve 15. By providing a polished layer, the friction between the filter cover 18 and the sliding groove 17 is reduced, making the filter cover 18 move more smoothly on the positioning sleeve 15.

[0020] Working principle: When using the positioning mechanism for projection welding of this projection welding machine, firstly, the mounting hole of the workpiece is fitted onto the mounting column 7. Then, the first hydraulic rod 3 drives the positioning sleeve 15 and the projection welding head 6 to move downward together. The positioning sleeve 15 positions the nut placed on the mounting hole of the workpiece. The cross-section of the opening groove 16 on the positioning sleeve 15 is an inverted funnel shape, which allows the position of the nut to gradually move to a position that coincides with the central axis of the mounting column 7, so as to accurately position the nut. Then, the second hydraulic rod 5 works to drive the welding head 6 to move downward for welding. The downward movement of the welding head 6 can drive the first toothed plate 8 to move together. The first toothed plate 8 drives the second toothed plate 11 to move upward through the meshing connection with the cylindrical gear 9, thereby driving the positioning sleeve 15 to move upward away from the nut, so as to avoid the positioning sleeve 15 sticking to the nut during welding. This device achieves the positioning function while improving the welding effect. Meanwhile, the filter cover 18 can hold the workpiece in place through the elastic connection formed with the compression spring 19. The filter cover 18 can cover the contact area between the welding head 6 and the nut, and can filter the light emitted by the welding head 6 when it is working, thus protecting the operator's eyes and improving safety and effectiveness to a certain extent.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning mechanism for projection welding in a projection welding machine, comprising a base (1), characterized in that: An inverted L-shaped connecting seat (2) is fixedly connected to the top of the base (1). A first hydraulic rod (3) is fixedly connected to the inner top wall of the connecting seat (2). A connecting plate (4) is fixedly connected to the bottom end of the first hydraulic rod (3). A second hydraulic rod (5) is fixedly connected to the middle of the bottom end of the connecting plate (4). A welding head (6) is fixedly connected to the bottom end of the second hydraulic rod (5). An installation column (7) is fixedly connected to the worktable at the top of the base (1) corresponding to the position of the welding head (6). An installation sleeve (14) is provided on the outside of the welding head (6). The outside of the welding head (6) is driven to move longitudinally by the transmission mechanism. A positioning sleeve (15) is threaded inside the installation sleeve (14). An opening groove (16) is opened in the middle of the bottom end of the positioning sleeve (15). The positioning sleeve (15) is sleeved on the outside of the welding head (6) and forms a sliding connection with the welding head (6). The outside of the positioning sleeve (15) is filtered by a protective mechanism.

2. The positioning mechanism for projection welding in a projection welding machine according to claim 1, characterized in that: The transmission mechanism includes a first toothed plate (8), a cylindrical gear (9), a support frame (10), a second toothed plate (11), a guide post (12), and a tension spring (13). The left and right ends of the welding head (6) are connected to the first toothed plate (8), and the other end of the first toothed plate (8) is meshed with the cylindrical gear (9). The bottom end of the connecting plate (4) is fixedly connected to the support frame (10). The cylindrical gear (9) and the support frame (10) form a rotatable connection. The end of the cylindrical gear (9) away from the first toothed plate (8) is meshed with the second toothed plate (11). The top end of the second toothed plate (11) is fixedly connected to the guide post (12). The guide post (12) passes through the entire connecting plate (4) and forms a sliding connection with the connecting plate (4). The tension spring (13) is fixedly connected between the connecting plate (4) and the second toothed plate (11).

3. The positioning mechanism for projection welding in a projection welding machine according to claim 2, characterized in that: The tension spring (13) is wound around the outside of the guide post (12), and the inner diameter of the tension spring (13) is larger than the outer diameter of the guide post (12).

4. The positioning mechanism for projection welding in a projection welding machine according to claim 1, characterized in that: The cross-section of the opening groove (16) on the positioning sleeve (15) is an inverted funnel shape, and the minimum internal dimension of the opening groove (16) on the positioning sleeve (15) matches the external dimension of the nut to be assembled.

5. The positioning mechanism for projection welding in a projection welding machine according to claim 1, characterized in that: The protective mechanism includes a slide (17), a filter (18) and a compression spring (19). The outer end of the positioning sleeve (15) is provided with a slide (17). The filter (18) is slidably connected inside the slide (17). The compression spring (19) is fixedly connected between the filter (18) and the inner top wall of the slide (17).

6. A positioning mechanism for projection welding in a projection welding machine according to claim 5, characterized in that: The cross-section of the groove (17) is annular, and a polished layer is provided at the contact point between the groove (17) and the filter cover (18).

Images