Mechanism for indirectly detecting leakage prevention of nut

Abstract

The utility model relates to a mechanism for indirectly detecting leakage prevention of a nut. The mechanism is composed of a welding clamp, a connecting plate, a positioning pin, a spring, a spring fixing support, a pin, a sensor and a sensor fixing support. The sensor is fixed on the welding fixture through the sensor fixing bracket and is controlled by the PCL; the connecting plate is fixed on a pressing unit of the welding fixture through a positioning pin; the spring fixing support is connected to the pressing unit of the welding clamp through a bolt and connected with the connecting plate through a spring. If a nut is arranged on a workpiece, the front end of the connecting plate is pressed to move upwards, the rear end of the connecting plate moves downwards and is close to the sensor through rotation with the positioning pin as the axis, the sensor transmits a sensing signal to the PLC after receiving the sensing signal, and the robot starts welding after the PLC receives the signal. According to the mechanism, the labor cost is reduced, the accuracy of detecting the welding skips of the nuts is greatly improved, defective products of parts are effectively prevented from flowing out due to the welding skips of the nuts, and the production quality of products is improved.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, specifically relating to a mechanism for indirectly detecting nut leakage. Background Technology

[0002] In modern manufacturing, automation of projection welding of nuts is still not widespread, and manual operation is still largely required, leading to frequent problems of incomplete welds. Currently, the most common method is manual inspection and marking, but this method not only increases labor costs but also introduces uncontrollable factors due to manual operation. Therefore, how to efficiently prevent incomplete welds and effectively reduce labor costs is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a mechanism for indirectly detecting nut leaks, so as to solve the problem of defective products flowing out due to the inability to detect nut leaks in time, and to realize the detection of nut leaks in the welding fixture.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A mechanism for indirectly detecting nut leakage includes a welding clamp 1, a connecting plate 2, a spring fixing bracket 5, a pin 6, and a sensor 7;

[0006] The connecting plate 2 is fixed to the clamping unit 11 of the welding fixture 1 by the positioning pin 3, and the clamping unit 11 clamps the parts by the cylinder; the positioning pin 3 and the connecting plate 2 are in clearance fit, and the connecting plate 2 can rotate about the positioning pin 3 as the axis;

[0007] The spring fixing bracket 5 is bolted to the clamping unit 11 of the welding fixture 1 and connected to the connecting plate 2 via the spring 4;

[0008] The pin 6 is fixed on the clamping block of the clamping unit 11 and is located below the connecting plate 2. It can prevent the connecting plate 2 from rotating too much and protruding too much from the clamping block.

[0009] The sensor 7 is fixed on the welding fixture 1 by the sensor fixing bracket 8. The sensor 7 is connected to the signal acquisition module through a quick connector. The signal acquisition module feeds back the received sensing signal sent by the sensor 7 to the PLC, and the PLC controls whether the robot performs welding.

[0010] When there is a nut on the workpiece, the clamping block and the connecting plate 2 clamp the nut simultaneously. The front end of the connecting plate 2 can move upward under pressure. Through the rotation of the positioning pin 3 as the axis, the rear end of the connecting plate 2 moves downward and approaches the sensor 7. After receiving the sensing signal, the sensor 7 transmits it to the PLC. After receiving the signal, the robot starts welding. When there is no nut on the workpiece, the front end of the connecting plate 2 protrudes from the clamping block of the welding fixture 1. The spring 4 contracts and pulls the rear end of the connecting plate 2 away from the sensor 7, so that the sensor 7 has no sensing signal.

[0011] Furthermore, the front and rear ends of the connecting plate 2 are both planar structures, the nut is located below the front end of the connecting plate 2, and the clamping unit 11 of the welding fixture 1 can contact the nut when clamping, and the plane of the front end of the connecting plate 2 is perpendicular to the upper surface of the nut.

[0012] Furthermore, the clamping unit 11 is bolted to the cylinder. When the start button of the welding fixture 1 is pressed, air enters through the air inlet of the cylinder, which drives the piston inside the cylinder to move. The movement of the piston can drive the clamping unit 11 of the external connecting plate of the cylinder to flip and clamp.

[0013] Furthermore, the signal acquisition module is connected to the PLC via a cable.

[0014] Furthermore, the spring fixing bracket 5 has two mounting holes, the upper part of which is a through hole and the lower part is a threaded hole, for connecting bolts.

[0015] Furthermore, the spring 4 is connected to the spring fixing bracket 5 and the connecting plate 2 respectively. The spring fixing bracket 5 is the fixed end, and the connecting plate 2 can rotate around the positioning pin 3.

[0016] Furthermore, the sensor fixing bracket 8 is composed of two U-shaped plastic blocks. The U-shaped position is used to clamp the sensor 7. Each plastic block has two threaded holes, which can be connected to the two threaded holes of the welding fixture 1 by passing two bolts through the corresponding threaded holes in sequence.

[0017] Furthermore, the direction of the sensor 7 perpendicular to the rear end of the connecting plate 2 can be adjusted by the sensor fixing bracket 8.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention provides a mechanism for indirectly detecting leaks in nuts, which can solve the problem of defective products being released because of missed welds in nuts. It replaces the inaccuracy of manual inspection, reduces labor costs, and greatly improves the accuracy of detecting missed welds in nuts. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the mechanism for indirectly detecting nut leakage according to this utility model;

[0022] Figures 2-8 This is a structural diagram of the mechanism for indirectly detecting nut leakage at various angles according to this utility model;

[0023] Figure 9 A schematic diagram of the structure of the sensor mounting bracket 8;

[0024] Figure 10 This is a schematic diagram of the spring fixing bracket 5;

[0025] Figure 11 This is a schematic diagram showing the location of the manufactured parts;

[0026] Figure 12 This is a schematic diagram showing the position of the clamping unit;

[0027] Figure 13 This is a schematic diagram of the pressing surface.

[0028] In the diagram, 1. Welding fixture 2. Connecting plate 3. Positioning pin 4. Spring 5. Spring fixing bracket 6. Pin 7. Sensor 8. Sensor fixing bracket 9. Threaded hole 10. Plastic block 11. Clamping unit. Detailed Implementation

[0029] The present invention will be further described below with reference to embodiments:

[0030] The present invention 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 present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figure 1As shown, the mechanism for indirectly detecting nut leakage of this utility model consists of a welding fixture 1, a connecting plate 2, a positioning pin 3, a spring 4, a spring fixing bracket 5, a pin 6, a sensor 7, and a sensor fixing bracket 8.

[0033] The sensor 7 is fixed to the fixed end of the welding fixture 1 by the sensor fixing bracket 8, so that the sensor 7 is stationary. For example, Figure 9 As shown, the sensor fixing bracket 8 is composed of two U-shaped plastic blocks 10. The U-shaped position is used to clamp the sensor 7. Each plastic block 10 has two threaded holes 9, which can be connected to the two threaded holes of the welding fixture 1 by passing two bolts through the corresponding threaded holes 9 in sequence.

[0034] The sensor 7 is controlled by a PLC to ensure that the robot does not weld if the sensor 7 does not receive a signal. Specifically, whether the robot welds is controlled by the PLC. The sensor 7 is connected to the signal acquisition module via a quick-connect connector, and the signal acquisition module is connected to the PLC via a cable. The signal acquisition module can feed back the signal received from the sensor 7 to the PLC. Upon receiving the signal, the PLC then controls the robot to continue the welding process. If the signal acquisition module does not receive a signal from the sensor 7, the PLC will not control the robot to continue its actions, the entire program will terminate, and an alarm will be issued. The PLC receiving signals from the signal acquisition module and then controlling the robot is a commonly used technology and will not be elaborated upon here.

[0035] The connecting plate 2 is fixed to the clamping unit 11 of the welding fixture 1 by a positioning pin 3, so that the positioning pin 3 and the connecting plate 2 are in clearance fit, ensuring that the connecting plate 2 can rotate around the positioning pin 3 as the axis. The pin 6 is fixed to the clamping block of the clamping unit 11, located below the connecting plate 2, to prevent the connecting plate 2 from rotating too much and protruding excessively from the clamping block. The clamping block is a component of the clamping unit 11 and its function is to clamp the parts. The cylinder can drive the entire clamping unit 11 to rotate, and when rotated to the correct position, the clamping block on the clamping unit 11 clamps the parts.

[0036] The spring fixing bracket 5 is bolted to the clamping unit 11 of the welding fixture 1 and connected to the connecting plate 2 via the spring 4. Figure 10 As shown, the spring fixing bracket 5 has two mounting holes, the upper part being a through hole and the lower part a threaded hole for connecting bolts. The spring 4 is connected to both the spring fixing bracket 5 and the connecting plate 2. The spring fixing bracket 5 is the fixed end, and the connecting plate 2 can rotate around the positioning pin 3. In the absence of a nut, the spring 4 retracts, pulling the rear end of the connecting plate 2 away from the sensor 7, so that the sensor 7 has no sensing signal when the nut is not present.

[0037] The front and rear ends of the connecting plate 2 are both planar structures, which increases the contact area with the nut and allows for accurate entry and exit from the sensing area of ​​the sensor 7. The nut is positioned below the front end of the connecting plate 2, ensuring contact with the nut when the clamping unit 11 of the welding fixture 1 clamps it. The plane at the front end of the connecting plate 2 is perpendicular to the upper surface of the nut; increasing the plane increases the contact area between the nut and the front end of the connecting plate 2, preventing false detections due to insufficient contact area. Similarly, the enlarged rear end plane of the connecting plate 2 also prevents the sensor 7 from failing to detect the nut due to insufficient contact area.

[0038] The direction of the sensor 7 perpendicular to the rear end of the connecting plate 2 can be adjusted via the sensor mounting bracket 8, facilitating the accurate positioning of the sensor 7. During the initial installation process, it is necessary to adjust the position of the sensor 7 to ensure that the sensor 7 can receive a signal when the nut is present, and that the sensor 7 cannot receive a sensing signal when the nut is not present. This can be achieved by adjusting the sensor mounting bracket 8; the bolts can be loosened to determine the position of the sensor 7, and then the bolts can be tightened to secure it.

[0039] After the workpiece is placed on welding fixture 1, the position of the workpiece is as follows: Figure 11 As shown, pressing the start button on the welding fixture 1 activates the clamping mechanism, and the clamping unit 11 on the welding fixture 1 clamps the parts via a cylinder. The start button and circuit structure of the welding fixture 1 are existing structures and technologies, and are not protected technical content, so they will not be described in detail.

[0040] The position of the clamping unit 11 is as follows Figure 12 As shown, the entire clamping unit 11 is bolted to the cylinder. When the start button of the welding fixture 1 is pressed, air enters through the air inlet of the cylinder, causing the piston inside the cylinder to move. The movement of the piston causes the clamping unit 11 of the external connecting plate of the cylinder to flip and clamp. Since the welding fixture 1 is a commonly used existing machine, its start button, clamping unit 11, cylinder and other structures will not be described in further detail.

[0041] If there is a nut on the workpiece, the front end of the connecting plate 2 will be pressed upwards. The rotation around the positioning pin 3 will cause the rear end of the connecting plate 2 to move downwards and approach the sensor 7. At this time, the sensor 7 receives a signal and transmits it to the PLC. Upon receiving the signal, the robot begins welding. Conversely, if there is no nut on the workpiece, the front end of the connecting plate 2 will remain at its original angle position after the welding fixture 1 clamps it, and will not move upwards. Furthermore, the rear end of the connecting plate 2 will not approach the sensor 7, causing the PLC to not receive a signal from the sensor 7. The robot will then be unable to weld and will trigger an alarm, thus effectively detecting the presence or absence of a nut.

[0042] This invention provides a mechanism for indirectly detecting leaks in nuts, which can solve the problem of defective products being released because of missed welds in nuts. It replaces the inaccuracy of manual inspection, reduces labor costs, and greatly improves the accuracy of detecting missed welds in nuts.

[0043] When welding fixture 1 is in the open state, the front end of connecting plate 2 protrudes from the clamping block of welding fixture 1, and the end of connecting plate 2 is far away from sensor 7; when welding fixture 1 clamps, the clamping block and connecting plate 2 simultaneously clamp the nut, causing the front end of connecting plate 2 to be compressed back, and the rear end of connecting plate 2 to approach sensor 7, thereby triggering the sensor's sensing switch, indicating that a nut is present and welding can proceed. Figure 13 As shown, the front end of the connecting plate 2 protrudes from the clamping surface of the clamp below. When the cylinder is open, the front end of the connecting plate 2 will be protruded from the clamping surface of the clamp by the force of the spring. After the welding fixture 1 clamps, the clamping surface of the welding fixture 1 and the front end of the connecting plate 2 will simultaneously press the nut. Therefore, when the nut is present, the front end of the connecting plate 2 will move upward due to the action of the nut.

[0044] This utility model's indirect nut leak detection mechanism effectively prevents defective parts from being shipped out due to missing nut welds, thus improving product manufacturing quality.

[0045] 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 mechanism for indirectly detecting nut leakage prevention, characterized in that: It includes a welding fixture (1), a connecting plate (2), a spring fixing bracket (5), a pin (6), and a sensor (7); The connecting plate (2) is fixed to the clamping unit (11) of the welding fixture (1) by the positioning pin (3), and the clamping unit (11) clamps the parts by the cylinder; the positioning pin (3) and the connecting plate (2) are in clearance fit, and the connecting plate (2) can rotate about the positioning pin (3) as the axis; The spring fixing bracket (5) is bolted to the clamping unit (11) of the welding fixture (1) and connected to the connecting plate (2) via the spring (4); The pin (6) is fixed on the clamping block of the clamping unit (11) and located below the connecting plate (2), which can prevent the connecting plate (2) from rotating too much and protruding too much from the clamping block; The sensor (7) is fixed on the welding fixture (1) by the sensor fixing bracket (8). The sensor (7) is connected to the signal acquisition module through the quick connector. The signal acquisition module feeds back the received sensor (7) to the PLC, and the PLC controls whether the robot performs welding. When there is a nut on the part, the clamping block and the connecting plate (2) clamp the nut at the same time. The front end of the connecting plate (2) can be pressed upward. Through the rotation of the positioning pin (3) as the axis, the rear end of the connecting plate (2) moves downward and approaches the sensor (7). After receiving the sensing signal, the sensor (7) transmits it to the PLC. After receiving the signal, the robot starts welding. When there is no nut on the part, the front end of the connecting plate (2) protrudes from the clamping block of the welding fixture (1). The spring (4) contracts and can pull up the rear end of the connecting plate (2) away from the sensor (7), so that the sensor (7) has no sensing signal.

2. The mechanism for indirectly detecting nut leakage prevention according to claim 1, characterized in that: The front and rear ends of the connecting plate (2) are both planar structures. The nut is located below the front end of the connecting plate (2). When the clamping unit (11) of the welding fixture (1) clamps, it can contact the nut. The plane of the front end of the connecting plate (2) is perpendicular to the upper surface of the nut.

3. The mechanism for indirectly detecting nut leakage prevention according to claim 1, characterized in that: The clamping unit (11) is bolted to the cylinder. When the start button of the welding fixture (1) is pressed, air enters through the air inlet of the cylinder, which drives the piston inside the cylinder to move. The movement of the piston can drive the clamping unit of the external connecting plate of the cylinder to flip and clamp.

4. The mechanism for indirectly detecting nut leakage prevention according to claim 1, characterized in that: The signal acquisition module is connected to the PLC via a cable.

5. The mechanism for indirectly detecting nut leakage according to claim 1, characterized in that: The spring fixing bracket (5) has two mounting holes, the upper part of which is a through hole and the lower part is a threaded hole, which are used to connect bolts.

6. The mechanism for indirectly detecting nut leakage prevention according to claim 1, characterized in that: The spring (4) is connected to the spring fixing bracket (5) and the connecting plate (2) respectively. The spring fixing bracket (5) is the fixed end, and the connecting plate (2) can rotate around the positioning pin (3) as the axis.

7. The mechanism for indirectly detecting nut leakage according to claim 1, characterized in that: The sensor fixing bracket (8) consists of two U-shaped plastic blocks (10). The U-shaped position is used to clamp the sensor (7). Each plastic block (10) has two threaded holes (9). Two bolts can be passed through the corresponding threaded holes (9) and threadedly connected to the two threaded holes of the welding fixture (1).

8. The mechanism for indirectly detecting nut leakage prevention according to claim 1, characterized in that: The direction of the sensor (7) perpendicular to the rear end of the connecting plate (2) can be adjusted by the sensor fixing bracket (8).

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