Detection mechanism for detecting welding skips of nuts

Abstract

The utility model discloses a detection mechanism for detecting whether a nut is missed in welding, and the detection mechanism comprises a linkage assembly which is disposed in a positioning groove disposed at the bottom of an upper electrode, and is used for the clamping of the nut in the detection of the missed welding; the linkage assembly comprises a plurality of positioning mechanisms and a linkage mechanism, the positioning mechanisms are installed in the positioning groove side by side at intervals, and the linkage mechanism is installed in the middle of the positioning groove. When the nut is not placed, the positioning rods on the positioning mechanisms do not move upwards, and the linkage rods on the linkage mechanism cannot be pushed to move downwards, so that the projection welding machine is not started, an operator finds welding skips, and then the welding skips detection accuracy of the nut is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a detection mechanism for detecting whether a nut has a missing weld. Background Technology

[0002] When welding nuts by projection welding, it is common for nuts to be missed during welding. Missing nuts will cause certain functions of the welded assembly to fail or the welded assembly to become unusable as a whole.

[0003] In existing technologies, to prevent incomplete welding of nuts, proximity sensor detection is typically used. This method requires the sensor to be close to the nut to perform the detection. Furthermore, existing detection mechanisms for missing welds in nuts (such as the nut mis-welding / missing weld detection device with application number 202120987929.3) use an extended detection pin that passes through the nut to detect whether a weld has been made. This detection method only checks for welded nuts and cannot detect situations where a nut is not present before welding, thus preventing incomplete welding. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a detection mechanism for detecting whether a nut has missing welds, so as to solve the technical problem that the existing detection mechanism for detecting whether a nut has missing welds can only detect whether the nut has been welded after welding, and cannot detect situations such as the absence of a nut before welding, thereby preventing the technical problem of missing welds.

[0005] According to the technical solution provided in the embodiments of this application, a detection mechanism for detecting whether a nut is missing a weld includes an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are respectively disposed opposite to each other.

[0006] The linkage component is located in the positioning groove at the bottom of the upper electrode and is used for nut locking during weld defect detection.

[0007] The linkage component includes a plurality of positioning mechanisms and a linkage mechanism. The plurality of positioning mechanisms are installed side by side and spaced apart in the positioning groove, while the linkage mechanism is installed in the middle of the positioning groove.

[0008] The positioning mechanism includes a positioning rod and a first piston. The positioning rod is installed at the bottom of the first piston, the first piston is installed inside the first cylinder, and the first cylinder is connected to a second cylinder through an air supply channel.

[0009] The linkage mechanism includes a second piston and a linkage rod. The linkage rod is installed at the bottom of the second piston, and the second piston is installed in the second cylinder. After the gas input from the first cylinder of each positioning mechanism enters the second cylinder, it pushes the linkage rod in the second cylinder to move downward in the vertical direction, abutting against the positioning pin installed on the lower electrode, and pushing the positioning pin to move slightly downward.

[0010] Furthermore, the top of the first piston abuts against the first elastic element, which is used for the return of the positioning rod.

[0011] Furthermore, a second elastic element is sleeved on the linkage rod, and the second elastic element is used for the return of the linkage rod.

[0012] Furthermore, a movable groove is provided on the lower electrode, and the positioning pin is installed in the movable groove. A limiting plate is provided in the middle of the positioning pin, and the limiting plate abuts against the third elastic member.

[0013] Furthermore, a sliding groove is provided at the middle of the bottom of the moving groove, and a detection sensor is installed at the bottom of the sliding groove.

[0014] Furthermore, an abutment rod is engaged within the groove, and the abutment rod is installed at the bottom of the positioning pin.

[0015] Furthermore, the detection sensor is electrically connected to the controller on the projection welding machine body.

[0016] Furthermore, the positioning pin, the positioning rod, and the linkage rod are all made of plastic.

[0017] Furthermore, the first elastic element, the second elastic element, and the third elastic element are metal springs.

[0018] In summary, the beneficial effects of this application are as follows: By setting a positioning groove on the upper electrode and installing several positioning mechanisms in the positioning groove, the positioning rods on the positioning mechanisms protrude and are installed in the positioning groove. During the welding process of the upper electrode and the nut and the part, the positioning rods are used for the positioning detection of the nut. When there is a nut in the welding process, each positioning rod moves upward, which in turn pushes the linkage rod on the linkage mechanism to move downward, which in turn pushes the positioning pin to move downward. The abutment rod installed at the bottom abuts against the detection sensor, which then senses the nut and starts the projection welding machine for welding. When no nut is placed, the positioning rods on the positioning mechanisms do not move upward and cannot push the linkage rod on the linkage mechanism to move downward, so that the projection welding machine does not start and the operator can detect the missing weld, thereby improving the accuracy of the nut missing weld detection. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the present invention.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the upper electrode of this utility model;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the lower electrode of this utility model.

[0024] The following are the labels in the diagram: Upper electrode-100, Positioning groove-110, Gas supply channel-120, Lower electrode-200, Positioning pin-210, Third elastic element-220, Abutment rod-230, Linkage assembly-300, Positioning mechanism-310, Positioning rod-311, First piston-312, First elastic element-313, Linkage mechanism-320, Linkage rod-321, Second piston-322, Second elastic element-323, Detection sensor-400. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] A testing mechanism for detecting whether a nut has a missing weld, its structure is as follows: Figures 1-4As shown, the system includes an upper electrode 100 and a lower electrode 200, which are correspondingly arranged so that the upper electrode 100 moves downward in the vertical direction and connects to the lower electrode 200; a linkage assembly 300 is disposed in a positioning groove 110 at the bottom of the upper electrode 100 for nut locking in the weld leak detection; the linkage assembly 300 includes several positioning mechanisms 310 and a linkage mechanism 320, the positioning mechanisms 310 are arranged side by side and spaced apart in the positioning groove 110, and the linkage mechanism 320 is installed in the middle of the positioning groove 110; the positioning mechanism 310 includes a positioning rod 311 and a first piston 312, the positioning rod 311 is installed at the bottom of the first piston 312, the first piston 312 is installed in a first cylinder, and the first cylinder is supplied with air. Channel 120 is connected to the second cylinder so that gas in the first cylinder enters the second cylinder, thereby pushing the linkage rod 321 installed in the second cylinder to move downward; the linkage mechanism 320 includes a second piston 322 and a linkage rod 321. The linkage rod 321 is installed at the bottom of the second piston 322, and the second piston 322 is installed in the second cylinder. After the gas input from the first cylinder on each positioning mechanism 310 enters the second cylinder, it pushes the linkage rod 321 in the second cylinder to move downward in the vertical direction, abutting against the positioning pin 210 installed on the lower electrode 200, and pushing the positioning slightly downward. Then, the abutment rod 230 installed at the bottom of the positioning pin 210 abuts against the detection sensor 400, so that the detection sensor 400 issues a welding command, thereby welding the nut to the part.

[0028] As a preferred embodiment, please refer to Figure 2 and Figure 3 The first piston 312 has a first elastic element 313 abutting its top. The first elastic element 313 is a metal spring. When the positioning rod 311 moves vertically, it pushes the first piston 312 connected to the top to move vertically along the first cylinder, thereby compressing the abutting first elastic element 313. After the test is completed, the positioning rod 311 releases its abutment, so that the first elastic element 313 returns to its original position, thereby driving the positioning rod 311 to return to its original position. This does not affect the welding test of the nut by the testing mechanism.

[0029] As a preferred embodiment, please refer to Figure 2 and Figure 3 A second elastic element 323 is sleeved on the linkage rod 321 so that when the gas in each of the first cylinders enters the second cylinder from the gas supply channel 120, it pushes the second piston 322 to move downward in the vertical direction, thereby compressing the metal spring of the second elastic element 323 sleeved on the linkage rod 321. When the test ends, the second elastic element 323 returns to its original position, thereby driving the linkage rod 321 to return to its original position, without affecting the welding test of the nut by the testing mechanism.

[0030] As a preferred embodiment, please refer to Figure 2 and Figure 4 A movable groove is provided on the lower electrode 200, and a positioning pin 210 is installed in the movable groove. A limit plate is provided in the middle of the positioning pin 210. The limit plate abuts against the third elastic element 220, and the third elastic element 220 is a metal spring. When the positioning pin 210 moves down under the push of the linkage rod 321, it compresses the metal spring abutting against the limit plate. After the test is completed, the compressed metal spring returns, thereby driving the positioning pin 210 to return, without affecting the normal use of the testing mechanism.

[0031] As a preferred embodiment, please refer to Figure 4 A sliding groove is provided at the middle of the bottom of the moving groove, and a detection sensor 400 is installed at the bottom of the sliding groove. The detection sensor 400 is electrically connected to the controller on the projection welding machine body. When the detection sensor 400 abuts against the abutment rod 230, a start command is issued so that the projection welding machine can weld the nut. When the detection sensor 400 does not abut against the abutment rod 230, no command is issued and the projection welding machine is not started to prevent mis-welding and other situations.

[0032] As a preferred embodiment, please refer to Figure 4 The abutment rod 230 is located at the bottom center of the positioning pin 210, and drives the abutment rod 230 to slide and engage in the slide groove. The abutment rod 230 is also provided with several positioning slide strips, and the slide groove is provided with corresponding positioning slide grooves, so that each positioning slide strip engages in the corresponding positioning slide groove, thereby allowing the abutment rod 230 to move and position along the slide groove.

[0033] As a preferred embodiment, please refer to Figure 2 The positioning pin 210, positioning rod 311, and linkage rod 321 are all made of plastic to prevent them from welding with metal parts or nuts during the welding process, which would affect the normal use of the testing mechanism.

[0034] As a preferred embodiment, please refer to Figure 3 and Figure 4 The first elastic element 313, the second elastic element 323, and the third elastic element 220 are metal springs. The first elastic element 313 is compressed when the positioning rod 311 moves vertically, the second elastic element 323 is compressed when the linkage rod 321 moves downward, and the third elastic element 220 is compressed when the positioning pin 210 moves downward. After the test is completed, each metal spring returns to its original position, which in turn drives the corresponding positioning rod 311, linkage rod 321, and positioning pin 210 to return to their original positions, thereby improving the accuracy of the testing mechanism in detecting whether the nut is welded.

[0035] The working principle of this utility model's detection mechanism for checking whether a nut has a missing weld is as follows:

[0036] During the inspection process of whether the nut in the projection welding machine is missing a weld, the inspection agency is locked to the projection welding machine, and a linkage component 300 is set on the upper electrode 100 of the projection welding machine. Several positioning mechanisms 310 on the linkage component 300 are vertically arranged side-by-side and spaced apart in the positioning grooves 110. As the upper electrode 100 moves downwards vertically, the positioning grooves 110 engage with the nut placed on the lower electrode 200, causing the nut to push the positioning rods 311 on each positioning mechanism 310 upwards vertically. This pushes the corresponding first pistons 312 connected to the top of each positioning rod 311 upwards along the first cylinder, thereby pushing the gas in each first cylinder into the second cylinder through the corresponding gas supply channel 120. The gas then pushes the second piston 322 in the second cylinder downwards vertically, and the linkage rod 321 connected to the bottom of the second piston 322 downwards vertically, engaging with the linkage rod 321 installed on the lower electrode 200. The positioning pin 210 abuts, thereby pushing the positioning pin 210 down along the moving groove, so that the abutting rod 230 set at the bottom of the positioning pin 210 moves down along the slide groove until it abuts against the detection sensor 400 installed at the bottom of the slide groove, so that the detection sensor 400 senses the presence of the nut, and then starts the projection welding machine to weld the nut to the part, preventing missed welding. When no nut is placed on the part to be welded by the lower electrode 200, the detection sensor 400 does not detect the nut and the projection welding machine is not started. During the detection process, the positioning rod 311, the linkage rod 321 and the positioning pin 210 are all fitted with corresponding metal springs, so that the first elastic element 313 abutting the positioning rod 311, the second elastic element 323 and the third elastic element 220 fitted on the linkage rod 321 and the positioning pin 210 are compressed when in use, and drive the corresponding positioning rod 311, the linkage rod 321 and the positioning pin 210 to return when not in use, thereby improving the detection accuracy of the detection mechanism.

[0037] The above description is merely a preferred embodiment of this application and an explanation of the technical principles and solutions employed. Furthermore, the scope of the utility model involved in this application is not limited to the specific combination of the above-described technical features, but should also cover other technical solutions formed by any combination of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A detection mechanism for detecting whether a nut has a leaky weld, comprising an upper electrode (100) and a lower electrode (200), wherein the upper electrode (100) and the lower electrode (200) are correspondingly arranged, characterized in that: The linkage component (300) is disposed in the positioning groove (110) provided at the bottom of the upper electrode (100) for nut locking in the weld leakage detection; The linkage component (300) includes a plurality of positioning mechanisms (310) and a linkage mechanism (320). The plurality of positioning mechanisms (310) are installed side by side and spaced apart in the positioning groove (110), while the linkage mechanism (320) is installed in the middle position of the positioning groove (110). The positioning mechanism (310) includes a positioning rod (311) and a first piston (312). The positioning rod (311) is installed at the bottom of the first piston (312). The first piston (312) is installed in a first cylinder, and the first cylinder is connected to a second cylinder through an air supply channel (120). The linkage mechanism (320) includes a second piston (322) and a linkage rod (321). The linkage rod (321) is installed at the bottom of the second piston (322), and the second piston (322) is installed in the second cylinder. After the gas input from the first cylinder of each positioning mechanism (310) enters the second cylinder, it pushes the linkage rod (321) in the second cylinder to move down in the vertical direction, abut against the positioning pin (210) installed on the lower electrode (200), and pushes the positioning slightly down.

2. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 1, is characterized in that: The top of the first piston (312) abuts against a first elastic element (313), which is used for the return of the positioning rod (311).

3. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 1, is characterized in that: A second elastic element (323) is sleeved on the linkage rod (321), and the second elastic element (323) is used for the return of the linkage rod (321).

4. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 1, is characterized in that: The lower electrode (200) is provided with a movable groove, and the positioning pin (210) is installed in the movable groove. A limiting plate is provided in the middle of the positioning pin (210), and the limiting plate abuts against the third elastic member (220).

5. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 4, is characterized in that: A sliding groove is provided at the middle of the bottom of the moving groove, and a detection sensor (400) is installed at the bottom of the sliding groove.

6. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 5, is characterized in that: An abutment rod (230) is engaged in the groove, and the abutment rod (230) is installed at the bottom of the positioning pin (210).

7. The detection mechanism for detecting whether a nut has a missing weld, as described in claim 5, is characterized in that: The detection sensor (400) is connected to the controller on the projection welding machine body.

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