Projection welding machine nut mistake welding detection mechanism

Abstract

The utility model belongs to projection welding machine technical field discloses a kind of projection welding machine nut mistake-proof welding detection mechanism, comprising: electrode module;Detection passage is formed in the electrode module inside;Positioning module;The positioning module includes moving cylinder and positioning probe, the positioning probe is driven in the detection passage by the moving cylinder and moves, and the positioning probe has the variable-diameter positioning portion with the front end diameter less than the rear end diameter;Detection module;The detection module includes positioner and sensor, the positioner moves synchronously with the positioning probe, and the sensor is used to detect the moving position of the positioner, the utility model cooperates with sensor by positioning probe and moving cylinder, so that when the nut specification error of input welding, nut hole cannot be adapted with positioning probe, moving cylinder does not move down, sensor does not sense floating distance, does not send welding signal, and can effectively prevent miswelding and miss welding.

Description

Technical Field

[0001] This utility model belongs to the field of projection welding machine technology, specifically relating to a projection welding machine nut anti-miswelding detection mechanism. Background Technology

[0002] In the projection welding process of sheet metal brackets in industries such as automobiles and home appliances, mis-welded holes in nuts (such as misalignment, missing welds, and mixed specifications) are a long-standing quality hazard. Traditional solutions rely on manual visual inspection, automatic screening of standard-compliant nuts via conveyor systems, or detection through intelligent control and visual recognition. However, manual visual inspection is inefficient: it takes about 15 seconds to inspect a single part and is affected by operator skill, making it difficult to meet the needs of large-scale production; it lacks reliability: the number of holes on parts is usually greater than that of nuts, and the holes are close to the nuts, making manual visual inspection prone to fatigue, resulting in a mis-inspection rate of over 10%; and it is costly: to ensure inspection quality, a large number of quality inspectors are required, and rework costs account for a significant proportion of production costs. The costs of nut conveyors or intelligent visual recognition are also high, making them unsuitable for widespread adoption. Therefore, it is particularly important to develop a low-cost and efficient projection welding machine nut mis-welding detection mechanism. Utility Model Content

[0003] In view of this, in order to solve the problems mentioned in the background art, the purpose of this utility model is to provide a detection mechanism for preventing incorrect welding of nuts in projection welding machines, so as to solve the existing problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a projection welding machine nut anti-miswelding detection mechanism, comprising: Electrode module; a detection channel is formed inside the electrode module; Positioning module; the positioning module includes a moving cylinder and a positioning probe, the moving cylinder drives the positioning probe to move within the detection channel, and the positioning probe has a variable diameter positioning part with a front end diameter smaller than the rear end diameter; A detection module; the detection module includes a locator and a sensor, the locator moves synchronously with the positioning probe, and the sensor is used to detect the position of the locator.

[0005] Preferably, the positioning probe includes a front section and a middle section, and the variable diameter positioning part is transitionally connected between the front section and the middle section.

[0006] Preferably, the electrode module includes an electrode cover, an electrode seat, and an electrode sleeve that are fixedly inserted in sequence, and at least part of the movable cylinder is fixed inside the electrode sleeve.

[0007] Preferably, the positioning probe includes a first limiting part disposed at the tail end, and the detection channel includes a second limiting part located inside the electrode cover. When the head end of the positioning probe extends out of the detection channel, the first limiting part is adapted to abut against the second limiting part.

[0008] Preferably, the surface of the first limiting portion is formed with a first limiting slope that extends and slopes towards the tail end, and the surface of the second limiting portion is formed with a second limiting slope that can press against the first limiting slope.

[0009] Preferably, the first limiting part has a frustum-shaped structure with one end larger than the other.

[0010] Preferably, the movable cylinder includes a cylinder sleeve and a cylinder rod that is installed through the inside of the cylinder sleeve. The cylinder sleeve has a gas chamber in the middle, and the cylinder rod has a limiting ring located inside the gas chamber.

[0011] Preferably, a spindle is connected to the top of the cylinder rod, the top of the spindle is fixedly connected to the bottom of the positioning probe, and the bottom of the cylinder rod is fixedly connected to the positioner.

[0012] Preferably, the cylinder sleeve is fixed to the electrode sleeve by an insertion connection, the electrode sleeve is fixedly connected to a sensor mounting plate by a connecting block, and the sensor mounting plate is fixedly connected to a protective cover by bolts.

[0013] Preferably, the sensor mounting plate is fixedly connected to the sensor via an insulating mechanism, so that the sensor and the positioner are arranged on the same vertical plane.

[0014] Compared with the prior art, this utility model has the following advantages: (1) This utility model, through the cooperation of the positioning probe and the moving cylinder with the sensor, ensures that when the input welding nut specification is incorrect, the nut hole cannot be matched with the positioning probe, the moving cylinder will not move down, the sensor cannot sense the floating distance, and no welding signal is sent, which can effectively prevent incorrect welding and missed welding.

[0015] (2) In this utility model, the variable diameter positioning part is provided so that the positioning probe can be stably engaged with the nut hole when it is inserted into the nut hole, and the positioning probe can be stably moved down when the nut is pressed down.

[0016] (3) In this utility model, by setting the first limiting part and the second limiting part, as well as the first limiting inclined surface and the second limiting inclined surface, the positioning probe can be moved stably in the detection channel, and the displacement of the positioning device can be controlled by limiting the moving distance of the positioning probe in the detection channel through the first limiting inclined surface and the second limiting inclined surface. Attached Figure Description

[0017] Figure 1 This is a planar sectional view of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a three-dimensional sectional view of the present invention; Figure 4 This is a perspective view of the present utility model; Figure 5 for Figure 3 Enlarged view of point A; In the diagram: Electrode module-10; Electrode cover-11; Second limiting part-111; Second limiting inclined surface-112; Electrode seat-12; Electrode sleeve-13; Positioning module-20; Moving cylinder-21; Cylinder sleeve-211; Cylinder rod-212; Air chamber-213; Limiting ring-214; Positioning probe-22; Front section-221; Middle section-222; First limiting part-223; First limiting inclined surface-224; Variable diameter positioning part-23; Detection module-30; Positioner-31; Sensor-32; Mandrel-40; Connecting block-50; Sensor mounting plate-60; Protective cover-70. Detailed Implementation

[0018] To further understand the content of this utility model, a detailed description of it is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art; they are not intended to limit the implementation of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to the embodiments of this application described herein.

[0019] Please see Figures 1-4 As shown, this utility model provides the following technical solution: a nut anti-miswelding detection mechanism for projection welding machines, including an electrode module 10, a positioning module 20 and a detection module 30.

[0020] The positioning module 20 includes a moving cylinder 21 and a positioning probe 22. The electrode module 10 has a detection channel inside to accommodate the positioning module 20. The moving cylinder 21 drives the positioning probe 22 to move up and down within the detection channel. The positioning probe 22 has a variable-diameter positioning part 23 with a front diameter smaller than its rear diameter. The detection module 30 includes a positioner 31 and a sensor 32. The positioner 31 and the positioning probe 22 move synchronously with the movement of the moving cylinder 21. The sensor 32 is used to detect the position of the positioner 31. In actual operation, by driving the moving cylinder 21 upwards, the variable-diameter positioning part 23 of the positioning probe 22 extends from the top of the electrode module 10, allowing the front end of the positioning probe 22 to be inserted into the nut to be welded. At this time, the upper electrode presses down on the nut (not shown in the figure). If the thread hole of the nut to be welded is smaller than... The maximum diameter of the variable diameter positioning part 23 allows the nut to be supported on it. At this time, a gap is formed between the bottom of the nut and the top of the electrode module 10. Under the action of the upper electrode pressing down, the nut moves down to abut against the top of the electrode module 10. At the same time, the variable diameter positioning part 23 drives the positioning probe 22 and the positioner 31 to move down synchronously. During this process, the sensor 32 detects that the movement distance of the positioner 31 is within the set distance range, and sends a signal to the controller (not shown in the figure) to energize and realize the welding of the nut to the sheet metal. If the screw hole of the nut to be welded exceeds the maximum diameter of the variable diameter positioning part 23, the nut is sleeved outside the positioning probe 22, and the bottom of the nut directly abuts against the top of the electrode module 10. At this time, the upper electrode pressing down will not push the nut down, and the corresponding positioning probe 22 and positioner 31 will not move down, thereby effectively avoiding mis-welding.

[0021] In one executable implementation of this embodiment, such as Figure 5 As shown, the positioning probe 22 includes a front section 221 and a middle section 222. The variable diameter positioning part 23 is connected between the front section 221 and the middle section 222. During testing, the variable diameter positioning part 23 is inserted into the screw hole of the nut to be tested. If the variable diameter positioning part 23 matches the screw hole to be tested, the nut will be positioned by the variable diameter positioning part 23 when it is pressed down, which will drive the positioning probe 22 to move down. If the diameter of the nut hole to be tested is larger than the diameter of the variable diameter positioning part 23, the variable diameter positioning part 23 cannot limit the nut, and the nut will not drive the positioning probe 22 to move down when it is pressed down.

[0022] In one executable implementation of this embodiment, reference is made to... Figure 3 and Figure 5As shown, the electrode module 10 includes an electrode cover 11, an electrode seat 12, and an electrode sleeve 13 that are fixedly inserted in sequence. At least part of the moving cylinder 21 is fixed inside the electrode sleeve 13. The positioning probe 22 includes a first limiting part 223 disposed at the tail end. The detection channel includes a second limiting part 111 located inside the electrode cover 11. When the head end of the positioning probe 22 extends out of the detection channel, the first limiting part 223 adapts to abut against the second limiting part 111. The length of the positioning probe 22 extending out of the detection channel can be limited by the cooperation of the first limiting part 223 and the second limiting part 111.

[0023] In one executable implementation of this embodiment, such as Figure 5 As shown, the surface of the first limiting part 223 has a first limiting slope 224 that extends and slopes towards the tail end, and the surface of the second limiting part 111 has a second limiting slope 112 that can press against the first limiting slope 224. The length of the positioning probe 22 extending is limited by the height of the first limiting slope 224 and the second limiting slope 112 that cooperate with each other.

[0024] In one executable implementation of this embodiment, such as Figure 5 As shown, the first limiting part 223 has a frustum-shaped structure with one end larger than the other.

[0025] In one executable implementation of this embodiment, reference is made to... Figure 1 As shown, the movable cylinder 21 includes a cylinder sleeve 211 and a cylinder rod 212 that is installed inside the cylinder sleeve 211. A gas chamber 213 is provided in the middle of the cylinder sleeve 211. A limiting ring 214 located inside the gas chamber 213 is provided on the cylinder rod 212. When air is filled into the gas chamber 213, the internal air pressure drives the limiting ring 214 to move upward. The upward movement of the limiting ring 214 drives the cylinder rod 212 to move upward within the cylinder sleeve 211. When air is released from the gas chamber 213, the limiting ring 214 moves downward under the action of the cylinder rod 212 and its own weight, driving the cylinder rod 212 to move downward within the cylinder sleeve 211 to complete the reset.

[0026] In one executable implementation of this embodiment, reference is made to... Figure 1 As shown, a spindle 40 is connected to the top of the cylinder rod 212. The top of the spindle 40 is fixedly connected to the bottom of the positioning probe 22. An insulating pad is provided at the connection between the spindle 40 and the positioning probe 22. The bottom of the cylinder rod 212 is fixedly connected to the positioner 31. The positioner 31 is a reflective component that can enhance the light signal intensity, such as a reflector or reflective sticker, which can improve measurement accuracy.

[0027] In one executable implementation of this embodiment, reference is made to... Figure 1 and Figure 2As shown, the cylinder sleeve 211 is fixed to the electrode sleeve 13 by insertion. The cylinder sleeve is inserted into the electrode sleeve 12. The electrode sleeve 13 is fixedly connected to the sensor mounting plate 60 by a connecting block 50. The connecting block 50 is a retainer formed by mutually cooperating [ ], and the mutually cooperating [ ] are fixedly connected by bolts. The sensor mounting plate 60 is fixedly connected to the cover 70 by bolts. The sensor mounting plate 60 and the sensor 32 are fixedly connected by an insulating mechanism. The insulating mechanism includes an insulating sleeve and a flat washer, as well as an internal hexagon bolt that fixes the insulating sleeve and the flat washer, so that the sensor 32 and the positioner 31 are arranged on the same vertical plane, so that the signal of the sensor 32 can be reflected back by the positioner 31. The sensor 32 can be a displacement sensor, such as a laser displacement sensor.

[0028] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A detection mechanism for preventing incorrect welding of nuts on a projection welding machine, characterized in that, include: Electrode module (10); a detection channel is formed inside the electrode module (10); Positioning module (20); The positioning module (20) includes a moving cylinder (21) and a positioning probe (22). The moving cylinder (21) drives the positioning probe (22) to move within the detection channel, and the positioning probe (22) has a variable diameter positioning part (23) with a front end diameter smaller than the rear end diameter. Detection module (30); The detection module (30) includes a locator (31) and a sensor (32). The locator (31) moves synchronously with the positioning probe (22), and the sensor (32) is used to detect the moving position of the locator (31).

2. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 1, characterized in that: The positioning probe (22) includes a front section (221) and a middle section (222), and the variable diameter positioning part (23) is transitionally connected between the front section (221) and the middle section (222).

3. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 1 or 2, characterized in that: The electrode module (10) includes an electrode cover (11), an electrode seat (12) and an electrode sleeve (13) that are fixedly inserted in sequence, and at least part of the moving cylinder (21) is fixed inside the electrode sleeve (13).

4. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 3, characterized in that: The positioning probe (22) includes a first limiting part (223) disposed at the tail end, and the detection channel includes a second limiting part (111) located inside the electrode cover (11). When the head end of the positioning probe (22) extends out of the detection channel, the first limiting part (223) is adapted to abut against the second limiting part (111).

5. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 4, characterized in that: The surface of the first limiting part (223) is formed with a first limiting slope (224) that extends and slopes towards the tail end, and the surface of the second limiting part (111) is formed with a second limiting slope (112) that can press against the first limiting slope (224).

6. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 5, characterized in that: The first limiting part (223) has a frustum-shaped structure with one end larger than the other.

7. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 3, characterized in that: The movable cylinder (21) includes a cylinder sleeve (211) and a cylinder rod (212) that is installed inside the cylinder sleeve (211). A gas chamber (213) is provided in the middle of the cylinder sleeve (211), and a limiting ring (214) located inside the gas chamber (213) is provided on the cylinder rod (212).

8. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 7, characterized in that: The top of the cylinder rod (212) is connected to a spindle (40), the top of the spindle (40) is fixedly connected to the bottom of the positioning probe (22), and the bottom of the cylinder rod (212) is fixedly connected to the positioner (31).

9. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 7, characterized in that: The cylinder sleeve (211) is fixed to the electrode sleeve (13) by insertion. The electrode sleeve (13) is fixedly connected to the sensor mounting plate (60) by a connecting block (50). The sensor mounting plate (60) is fixedly connected to the cover (70) by bolts.

10. The anti-miswelding detection mechanism for projection welding machine nuts according to claim 9, characterized in that: The sensor mounting plate (60) and the sensor (32) are fixedly connected by an insulating mechanism so that the sensor (32) and the locator (31) are arranged on the same vertical plane.

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