Automatic leak detection machine for rivet nuts

Abstract

The application relates to the technical field of nut detection, and particularly discloses an automatic leak detection machine for rivet nuts, which comprises a machine body, a workpiece fixedly connected to the outer surface of the upper end of the machine body, and a nut riveted to the outer surface of the upper end of the workpiece; a detection assembly located on the outer surface of the upper end of the machine body and used for detecting whether the workpiece surface is missed with the nut; and a calibration assembly located on the annular outer surface of the detection assembly and used for detecting whether the nut on the workpiece surface is missed through the movement of a telescopic rod driven by a cylinder. In order to avoid measurement errors caused by the placement of the workpiece, when the axis of the nut is not collinear with the telescopic rod, the end of the telescopic rod is calibrated by the calibration assembly, the entire cylinder moves downward along a compensation groove, the stroke in the vertical direction caused by the inclination of the telescopic rod is compensated, and the measurement accuracy is ensured. The telescopic rod and the workpiece are protected by a protection assembly, the indentation on the surface of the workpiece is reduced, and the workpiece is more beautiful.

Description

Technical Field

[0001] This invention relates to the field of nut testing technology, specifically to an automatic leak detector for rivet nuts. Background Technology

[0002] Rivet nuts belong to the field of fasteners and are widely used in the assembly of automotive, aerospace, instrumentation, furniture, decoration, and other light industrial products. They were developed to address the shortcomings of welded nuts on thin metal sheets and tubes, such as easy melting and stripping of internal threads. They eliminate the need for tapping internal threads and welding nuts, providing strong and efficient riveting, and are easy to use.

[0003] To inspect the rivet nuts on the surface of workpieces and ensure they meet relevant regulations, after the rivet nuts are installed, employees place the workpiece on an inspection machine to check the installation height and inner diameter of the nuts, preventing any rivet nuts from being missed. Existing inspection methods involve using a cylinder to move the workpiece to the bottom of the inspection cylinder, venting the cylinder, and using sensors to measure the movement position of the cylinder piston rod to determine compliance. However, due to the small size of the rivet nuts, placement and installation errors during inspection can cause the nut's original axis to deviate from the cylinder piston rod's axis. This prevents the piston rod from accurately inserting into the nut, thus hindering effective inspection. Therefore, we propose an automatic rivet nut leak detection machine. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic leak detection machine for rivet nuts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic leak detection machine for rivet nuts, comprising a machine body, a workpiece fixedly connected to the upper outer surface of the machine body, and a nut riveted to the upper outer surface of the workpiece.

[0006] The detection component is located on the outer surface of the upper end of the machine body and is used to detect whether there are missing nuts on the surface of the workpiece.

[0007] The calibration component is located on the annular outer surface of the detection component and is used to calibrate the detection component so that it can rotate at a certain angle.

[0008] The buffer component is located above the detection component and protects the detection component.

[0009] Preferably, the detection component includes a fixing plate, which is fixedly connected to the upper outer surface of the machine body. A cylinder is fixedly connected to the upper outer surface of the fixing plate. The cylinder has a telescopic rod inside. There are several sets of cylinders, which correspond to the positions of each set of nuts to be tested on the workpiece.

[0010] Preferably, the calibration component includes a ball groove, which is formed inside the fixed plate. A hinge ball is rotatably connected inside the ball groove, and the hinge ball is fixedly connected to the lower outer surface of the cylinder.

[0011] Preferably, the upper end of the fixed plate is provided with a compensation groove, a compensation block is slidably connected inside the compensation groove, a ball groove is opened inside the compensation block, a guide block is fixedly connected to the side wall of the compensation block, a guide groove is opened inside the compensation groove at the corresponding position of the guide block, the guide block is located inside the guide groove, a return spring is fixedly connected between the guide block and the guide groove, a blocking ring is fixedly connected to the upper end of the fixed plate, a cylinder passes through the blocking ring, and a vector push ring is fixedly connected to the outer surface of the cylinder.

[0012] Preferably, both the guide groove and the guide block are rectangular in design, the vector push ring is made of magnet, and the blocking ring is made of metal.

[0013] Preferably, a limiting groove is formed on the lower outer surface of the blocking ring, and a limiting block is fixedly connected to the upper outer surface of the vector push ring at the corresponding position of the limiting groove. The limiting block is made of an elastic material.

[0014] Preferably, the calibration assembly also includes a spring tube, which is fixedly connected to the outer surface of the lower end of the telescopic rod. The spring tube is made of beryllium copper alloy, and a connector is fixedly connected to the outer surface of the lower end of the spring tube.

[0015] Preferably, the connector is made of metal, and a displacement groove is formed on the annular outer surface of the connector. A displacement rod is slidably connected inside the displacement groove. A conical block is fixedly connected to the end of the displacement rod away from the displacement groove. There are four sets of conical blocks, which are made of magnets and are arranged in a circular array with the center of the connector as the midpoint. An adjustment ring is threadedly connected to the annular outer surface of the connector near the lower end.

[0016] Preferably, the buffer assembly includes a sliding groove, which is formed on the outer surface of the upper end of the cylinder. A sliding rod is slidably connected inside the sliding groove. A through groove is formed in the middle of the sliding rod. A through groove is formed on the outer annular surface of the sliding rod. A magnetic ring is fixedly connected to the outer annular surface of the sliding rod. A magnetic ring is fixedly connected to the inner surface of the sliding groove at a position corresponding to the magnetic ring. The magnetic rings are magnetically attracted to each other. A slider is fixedly connected to the outer annular surface of the sliding rod. A sliding groove is formed at a position corresponding to the sliding block. The slider is located inside the sliding groove.

[0017] Preferably, both the slider and the slide groove are rectangular in design, a reset plate is fixedly connected to the upper outer surface of the cylinder, the reset plate is located directly above the sliding rod, and a reciprocating spring is fixedly connected between the reset plate and the sliding rod.

[0018] The present invention has at least the following beneficial effects:

[0019] The detection component uses a cylinder to move a telescopic rod to check for any missing nuts on the workpiece surface. To avoid measurement errors caused by workpiece placement, when the nut's axis is not collinear with the telescopic rod, a calibration component calibrates the end of the telescopic rod. The entire cylinder moves downward along the compensation groove to compensate for the vertical travel caused by the telescopic rod's tilt, ensuring measurement accuracy. A protection component protects the telescopic rod and the workpiece, reducing indentations on the workpiece surface and increasing its aesthetic appeal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the calibration component and the detection component of the present invention;

[0022] Figure 3 This is a cross-sectional structural diagram of the calibration component of the present invention;

[0023] Figure 4 This is an exploded view of the calibration component of the present invention;

[0024] Figure 5 This is a schematic diagram of the vector push ring and the blocking ring of the present invention;

[0025] Figure 6 This is a cross-sectional structural diagram of the buffer component of the present invention;

[0026] Figure 7 This is a schematic diagram of the sliding rod of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of a second embodiment of the calibration component of the present invention;

[0028] Figure 9 This is a schematic cross-sectional side view of a second embodiment of the calibration component of the present invention;

[0029] Figure 10 This is a schematic diagram of the overall exploded structure of the present invention.

[0030] In the diagram: 1. Body; 2. Detection component; 20. Cylinder; 21. Telescopic rod; 22. Spring tube; 23. Adjusting ring; 24. Connector; 25. Displacement groove; 26. Displacement rod; 27. Conical block; 3. Fixing plate; 4. Calibration component; 40. Compensation groove; 41. Compensation block; 42. Ball groove; 43. Hinge ball; 44. Guide groove; 45. Guide block; 46. Return spring; 47. Blocking ring; 48. Limiting groove; 49. Vector push ring; 491. Limiting block; 5. Buffer component; 50. Sliding groove; 51. Sliding rod; 52. Sliding groove; 53. Sliding block; 54. Magnetic ring one; 55. Magnetic ring two; 56. Return plate; 57. Reciprocating spring; 58. Through groove two; 59. Through groove one. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-10 The present invention provides a technical solution: Embodiment 1, an automatic leak detection machine for rivet nuts, including a machine body 1, a workpiece fixedly connected to the upper outer surface of the machine body 1, a nut riveted to the upper outer surface of the workpiece, the workpiece being fed by an electric slide rail fixedly connected to the machine body 1, and the workpiece being sent to the area below the detection component 2:

[0033] The detection component 2 is located on the upper outer surface of the machine body 1. It detects whether the workpiece surface is missing a nut. By venting the cylinder 20, the telescopic rod 21 moves downward. The distance of movement of the telescopic rod 21 is read by the sensor to determine whether a nut is missing.

[0034] Calibration component 4 is located on the annular outer surface of detection component 2. It calibrates detection component 2 so that it can rotate at a certain angle, thus preventing detection component 2 from failing to detect properly due to misalignment of the workpiece.

[0035] The buffer component 5 is located at the upper end of the detection component 2 to protect the detection component 2 and prevent damage to the detection component 2 due to excessive air pressure.

[0036] The detection component 2 includes a fixing plate 3, which is fixedly connected to the upper outer surface of the machine body 1. A cylinder 20 is fixedly connected to the upper outer surface of the fixing plate 3. The cylinder 20 has a telescopic rod 21 inside. There are several sets of cylinders 20, which correspond to the position of each set of nuts to be tested on the workpiece. When the workpiece moves to the designated location, the sensor sends a command to the cylinder 20 to make the telescopic rod 21 move downward and insert into the nut to be tested, so as to detect the nut.

[0037] The calibration component 4 includes a ball groove 42, which is located inside the fixed plate 3. A hinge ball 43 is rotatably connected inside the ball groove 42. The hinge ball 43 is fixedly connected to the lower outer surface of the cylinder 20. When the nut and the telescopic rod 21 are not on the same axis due to the placement error of the workpiece, the end of the telescopic rod 21 is subjected to a horizontal force during the insertion process, which causes the cylinder 20 to rotate around the hinge ball 43 as the fulcrum, thereby ensuring that the telescopic rod 21 can be inserted into the nut.

[0038] The upper end of the fixed plate 3 is provided with a compensation groove 40. A compensation block 41 is slidably connected inside the compensation groove 40. A ball groove 42 is opened inside the compensation block 41. A guide block 45 is fixedly connected to the side wall of the compensation block 41. A guide groove 44 is opened inside the compensation groove 40 at the corresponding position of the guide block 45. The guide block 45 is located inside the guide groove 44. A return spring 46 is fixedly connected between the guide block 45 and the guide groove 44. A blocking ring 47 is fixedly connected to the upper end of the fixed plate 3. The cylinder 20 passes through the blocking ring. A vector push ring 49 is fixedly connected to the outer surface of the cylinder 20. When the telescopic rod 21 is inserted into the nut in an inclined position, the cylinder 20 deflects. At this time, the edge of the vector push ring 49 contacts the lower surface of the blocking ring 47, so that the cylinder 20 and the compensation block 41 move downward along the compensation groove 40 under the guidance of the guide block 45, thereby compensating for the vertical displacement of the deflected telescopic rod 21 and reducing measurement error.

[0039] Both the guide groove 44 and the guide block 45 are rectangular structures. The vector push ring 49 is made of magnets, and the blocking ring 47 is made of metal. Through magnetic connection, the cylinder 20 can automatically reset under the blocking of the vector push ring 49 and the blocking ring 47 after the telescopic rod 21 is reset, and is fixed by magnetic force.

[0040] A limiting groove 48 is formed on the lower outer surface of the blocking ring 47. A limiting block 491 is fixedly connected to the upper outer surface of the vector push ring 49 at the corresponding position of the limiting groove 48. The limiting block 491 is made of elastic material. By inserting the limiting block 491 into the limiting groove 48, the cylinder 20 is prevented from rotating. At the same time, the elastic limiting block 491 will not hinder the rotation of the vector push ring 49. The limiting block 491 can be replaced by a spring sheet.

[0041] According to the above embodiments, in Embodiment 2, the calibration component 4 further includes a spring tube 22, which is fixedly connected to the lower outer surface of the telescopic rod 21. The spring tube 22 is made of beryllium copper alloy. A connector 24 is fixedly connected to the lower outer surface of the spring tube 22. When the connector 24 is inserted into the offset nut under the action of the spring tube 22, its own elasticity further ensures that the telescopic rod 21 and the connector 24 can be inserted into the nut to be tested. After the connector 24 is pulled out of the nut, the spring tube 22 automatically resets. The spring tube 22 has a hollow cylindrical structure, which has high toughness while maintaining elasticity.

[0042] The connector 24 is made of metal. A displacement groove 25 is formed on the annular outer surface of the connector 24. A displacement rod 26 is slidably connected inside the displacement groove 25. A conical block 27 is fixedly connected to the end of the displacement rod 26 away from the displacement groove 25. There are four sets of conical blocks 27, which are made of magnets and are arranged in a circular array with the center of the connector 24 as the center point. An adjusting ring 23 is threadedly connected to the annular outer surface of the connector 24 near the lower end. The adjusting ring 23 has a conical structure design. By rotating the adjusting ring 23, the conical surface compresses the conical block 27, causing it to move along the displacement groove 25 towards the outer surface of the connector 24 under the action of the displacement rod 26. At the same time, the conical block 27 and the connector 24 attract each other, increasing the stability of the four sets of conical blocks 27. By adjusting the adjusting ring 23, the overall size of the connector 24 can be adjusted to accommodate nuts of different sizes.

[0043] The buffer assembly 5 includes a sliding groove 50, which is formed on the upper outer surface of the cylinder 20. A sliding rod 51 is slidably connected inside the sliding groove 50. A through groove 59 is formed in the middle of the sliding rod 51, and a through groove 58 is formed on the annular outer surface of the sliding rod 51. A magnetic ring 54 is fixedly connected to the annular outer surface of the sliding rod 51. A magnetic ring 55 is fixedly connected to the inner surface of the sliding groove 50 at a position corresponding to the magnetic ring 54. The magnetic rings 54 and 55 are magnetically attracted to each other. A slider 53 is fixedly connected to the annular outer surface of the sliding rod 51. A groove 52 is formed in the sliding groove 50 at a position corresponding to the slider. 53 is located inside the slide groove 52. The through groove 1 59 and through groove 2 58 are designed in a T-shape. When the internal pressure of the cylinder 20 is too high, the remaining gas pushes the sliding rod 51 to move upward along the slide groove 50, connecting the T-shaped through groove 1 59 and through groove 2 58 with the outside air. This allows excess gas to be discharged, preventing the telescopic rod 21 from leaving marks on the workpiece surface. The magnetic force generated by magnetic ring 1 54 and magnetic ring 2 55 limits and blocks the sliding rod 51. The sliding rod 51 will only move along the slide groove 50 when the internal air pressure of the cylinder 20 is greater than the magnetic force of magnetic ring 1 54 and magnetic ring 2 55.

[0044] Both slider 53 and slide groove 52 are rectangular structures. The upper outer surface of cylinder 20 is fixedly connected to reset plate 56. Reset plate 56 is located directly above sliding rod 51. Reciprocating spring 57 is fixedly connected between reset plate 56 and sliding rod 51. When sliding rod 51 slides upward, it will compress reciprocating spring 57, and reciprocating spring 57 will cause sliding rod 51 to reset.

[0045] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic leak detection machine for rivet nuts, comprising a machine body (1), wherein a workpiece is fixedly connected to the upper outer surface of the machine body (1), and a nut is riveted to the upper outer surface of the workpiece, characterized in that: The detection component (2) is located on the outer surface of the upper end of the machine body (1) and is used to detect whether the workpiece surface is missing a nut. The calibration component (4) is located on the annular outer surface of the detection component (2) to calibrate the detection component (2) so that it can rotate at a certain angle; A buffer component (5) is located at the upper end of the detection component (2) to protect the detection component (2); The detection component (2) includes a fixing plate (3), which is fixedly connected to the upper outer surface of the machine body (1). A cylinder (20) is fixedly connected to the upper outer surface of the fixing plate (3). A telescopic rod (21) is provided inside the cylinder (20). The number of cylinders (20) is several sets, and they correspond to the positions of the nuts to be tested on each set of workpieces. The buffer assembly (5) includes a sliding groove (50), which is formed on the outer surface of the upper end of the cylinder (20). A sliding rod (51) is slidably connected inside the sliding groove (50). A through groove (59) is formed in the middle of the sliding rod (51). A through groove (58) is formed on the annular outer surface of the sliding rod (51). A magnetic ring (54) is fixedly connected to the annular outer surface of the sliding rod (51). A magnetic ring (55) is fixedly connected to the inner surface of the sliding groove (50) at a position corresponding to the magnetic ring (54). The cylinder (20) is magnetically attracted to the magnetic ring (55). A slider (53) is fixedly connected to the outer surface of the sliding rod (51). A groove (52) is opened at the corresponding position of the sliding block and the sliding groove (50). The slider (53) is located inside the groove (52). Both the slider (53) and the groove (52) are rectangular structures. A reset plate (56) is fixedly connected to the outer surface of the upper end of the cylinder (20). The reset plate (56) is located directly above the sliding rod (51). A reciprocating spring (57) is fixedly connected between the reset plate (56) and the sliding rod (51). The sliding rod (51) will only move along the sliding groove (50) when the internal air pressure of the cylinder (20) is greater than the magnetic force of magnetic ring one (54) and magnetic ring two (55).

2. The automatic leak detection machine for rivet nuts according to claim 1, characterized in that: The calibration component (4) includes a ball groove (42) which is opened inside the fixed plate (3). A hinge ball (43) is rotatably connected inside the ball groove (42), and the hinge ball (43) is fixedly connected to the lower outer surface of the cylinder (20).

3. The automatic leak detection machine for rivet nuts according to claim 2, characterized in that: The upper end of the fixed plate (3) is provided with a compensation groove (40), and a compensation block (41) is slidably connected inside the compensation groove (40). The ball groove (42) is opened inside the compensation block (41). A guide block (45) is fixedly connected to the side wall of the compensation block (41). A guide groove (44) is opened inside the compensation groove (40) at a position corresponding to the guide block (45). The guide block (45) is located inside the guide groove (44). A reset spring (46) is fixedly connected between the guide block (45) and the guide groove (44). A blocking ring (47) is fixedly connected to the upper end of the fixed plate (3). The cylinder (20) passes through the blocking ring. A vector push ring (49) is fixedly connected to the outer surface of the cylinder (20).

4. The automatic leak detection machine for rivet nuts according to claim 3, characterized in that: The guide groove (44) and guide block (45) are both rectangular structures. The vector push ring (49) is made of magnets, and the blocking ring (47) is made of metal.

5. The automatic leak detection machine for rivet nuts according to claim 4, characterized in that: The lower outer surface of the blocking ring (47) has a limiting groove (48), and the upper outer surface of the vector push ring (49) is fixedly connected to the limiting groove (48) with a limiting block (491) at the corresponding position. The limiting block (491) is made of elastic material.

6. The automatic leak detection machine for rivet nuts according to claim 2, characterized in that: The calibration component (4) also includes a spring tube (22), which is fixedly connected to the outer surface of the lower end of the telescopic rod (21). The spring tube (22) is made of beryllium copper alloy, and a connector (24) is fixedly connected to the outer surface of the lower end of the spring tube (22).

7. The automatic leak detection machine for rivet nuts according to claim 6, characterized in that: The connector (24) is made of metal. A displacement groove (25) is provided on the annular outer surface of the connector (24). A displacement rod (26) is slidably connected inside the displacement groove (25). A conical block (27) is fixedly connected to one end of the displacement rod (26) away from the displacement groove (25). There are four sets of conical blocks (27), which are made of magnets and are arranged in a circular array with the center of the connector (24) as the midpoint. An adjusting ring (23) is threadedly connected to the annular outer surface of the connector (24) near the lower end.

Images