Mistake-proof male die for pressing rivet nut

Abstract

The utility model relates to a rivet nut mistake-proofing male die which comprises a male die supporting column, a female die, a male die, a female die and a male die, the riveting block is arranged at one end of the male die supporting column in a sleeving manner, and a first channel is formed in the riveting block; one end of the guide pin is arranged in the cavity, the other end of the guide pin extends out of the first channel, and a mounting groove penetrating through the side wall of the guide pin is formed in the guide pin; the elastic clamping piece is arranged in the mounting groove and is provided with a plurality of pitch clamping plates; the first elastic piece is located between the guide pin and the riveting block; and the riveting block is provided with a first position and a second position, when the riveting block is located at the first position, the first elastic piece is in a natural state, and the pitch clamping plate abuts against the first channel, and when the riveting block is switched to the second position, the first elastic piece is in a compressed state, and the pitch clamping plate resets to extend out of the mounting groove. According to the riveting male die, the nut specification can be verified, errors possibly caused by manual fatigue inspection are effectively eliminated, and the product rejection rate and customer complaints are remarkably reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of riveting machines, in particular to a rivet nut mistake-proof punch. BACKGROUND

[0002] In the field of mechanical processing, riveting structure is a common connection method. In the existing riveting structure, the riveting nut is usually placed below, and its operation mode has various cases, such as placing the nut first and then placing the product, or placing the product first and then placing the nut, and then performing single riveting operation. In this process, the main function of the riveting punch is to apply pressure to complete riveting, and it does not identify whether the nut is correct. The correctness of the nut usually depends on the vibration disc screening to deliver the correct nut, or relies on other mistake-proof mechanisms to ensure; when multiple specifications of nuts need to be riveted on a product at the same time, multiple vibration discs may be needed to deliver the correct nuts respectively, or a visual recognition system may be used for confirmation. When the production is small and manual operation is used, the operator usually identifies the riveting nut by visually checking the shape of the riveting nut.

[0003] However, this traditional riveting method has many problems in actual application. For example, when the production is limited, the addition of vibration discs, conveyors and visual mistake-proof devices will increase the development cost, which is not economical for small production scenarios. At the same time, in the riveting operation of some specific products, such as riveting 4 nuts on a product and involving 2 different specifications (such as M6 and M8), if the outer diameters of the nuts are the same but the riveting step heights only differ by 0.3 mm and the pitches are different, the mistake-proofing difficulty increases significantly. In addition, in the case of small production, manual clamping operation is used, not only to prevent the wrong specification of the nut, but also to avoid the occurrence of missing loading. Moreover, if the 4 nuts riveted on the product are not in the same plane, nor in parallel planes, but exist in 3 normal planes with different angles, the product is likely to be stuck in the lower tooling after riveting at the same time if the nut is placed first and then the product is placed; if the lower tooling is designed as a movable mechanism, although it can solve the problem of product sticking, it will make the entire tooling structure become a movable mechanism with upper and lower inclined wedges, which greatly increases the design complexity and increases the cost accordingly, which is not conducive to the implementation of mistake-proof design. SUMMARY

[0004] The embodiment of the present application provides a rivet nut mistake-proof punch to solve the problem of incorrect installation of nuts caused by the riveting punch not verifying the specification of the nut in the related art.

[0005] In a first aspect, a rivet nut mistake-proof punch is provided, comprising:

[0006] a punch support column having a cavity in the axial direction;

[0007] a riveting block sleeved at one end of the punch support column and having a first channel;

[0008] a guide pin, one end of which is arranged in the cavity and the other end of which extends out of the first channel, the guide pin being provided with a mounting slot penetrating through the sidewall thereof;

[0009] a resilient clamping member arranged in the mounting slot and having a plurality of toothed clamping plates;

[0010] a first elastic member located between the guide pin and the riveting block;

[0011] and the riveting block has a first position and a second position, and when in the first position, the first elastic member is in a natural state, and the toothed clamping plates abut against the first channel, and when switched to the second position, the first elastic member is in a compressed state, and the toothed clamping plates are reset to extend out of the mounting slot.

[0012] In some embodiments, the resilient clamping member includes a rotating shaft arranged in the mounting slot and two toothed clamping plates, and the two toothed clamping plates are connected to the rotating shaft in an interlaced manner.

[0013] In some embodiments, a tension adjusting mechanism is further included, which abuts against the resilient clamping member and is used to adjust the tension of the resilient clamping member.

[0014] In some embodiments, the guide pin is provided with a sliding slot in communication with the mounting slot;

[0015] The tension adjusting mechanism includes an adjusting member, a second elastic member and a push rod, the adjusting member is arranged in the cavity, one end of the push rod penetrates through the sliding slot and abuts against the resilient clamping member, and the other end of the push rod is provided with the second elastic member between the adjusting member.

[0016] In some embodiments, the adjusting member is a threaded plug, and the threaded plug is threadedly connected to the punch support column.

[0017] In some embodiments, an included angle between the wall surface of the tension adjusting mechanism abutting against the resilient clamping member and the axis of the punch support column is α, and 30°≤α≤60°.

[0018] In some embodiments, the toothed clamping plate is a resilient steel sheet.

[0019] In some embodiments, the toothed clamping plate is provided with a protrusion at an end away from the mounting slot, and an included angle between the sidewall of the protrusion and the axis of the punch support column is β, and 30°≤β≤60°.

[0020] In some embodiments, a plurality of fixing pins are arranged in a circumferential direction along the sidewall of the punch support column, the fixing pins are arranged in a radial direction along the punch support column, and the riveting block is provided with a limiting slot matching the number and position of the fixing pins.

[0021] In some embodiments, the punch support column is fixedly installed with a sensor on the side wall, and the sensor is used to measure the displacement of the riveting block.

[0022] The embodiment of the present application provides a rivet nut mistake-proof punch, in use, the nut is sleeved on the bottom of the pilot pin. For M6 and M8 two specifications of nuts, due to the difference between the bottom hole diameter and the pilot pin diameter, a natural mistake-proof mechanism is realized: the M6 nut cannot be sleeved on the pilot pin due to the smaller bottom hole, thereby avoiding the case that the M8 nut is mistakenly installed in the M6 position; when the M8 nut is installed in the M6 position, the M8 nut can pass through the pilot pin, and due to the randomness of the concentricity during manual clamping, the M8 nut can be temporarily hung by the elastic clamping piece, under the action of the pushing force of the first elastic piece on the riveting block and the gravity of the nut, the M8 nut will finally fall off the elastic clamping piece, thereby realizing the mistake-proofing of the M8 nut mistakenly installed in the M6 position; when the nut and the pilot pin are matched in size, the riveting block is pushed upward, the first elastic piece is compressed, the elastic clamping piece is stretched and clamped on the large diameter of the screw thread, and the nut will not fall off due to gravity. Therefore, the riveting punch of the present application can verify the nut specification, effectively eliminates the mistakes caused by manual fatigue inspection, and significantly reduces the product scrap rate and customer complaints. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Fig. 1 A planar structure schematic diagram of the rivet nut mistake-proof punch provided by the embodiment of the present application is shown in the figure.

[0025] Fig. 2 An A-A cross-sectional structure schematic diagram of the rivet nut mistake-proof punch provided by the embodiment of the present application is shown in the figure.

[0026] Fig. 3 A B-B cross-sectional structure schematic diagram of the rivet nut mistake-proof punch provided by the embodiment of the present application is shown in the figure.

[0027] Fig. 4 A C enlarged structure schematic diagram of the rivet nut mistake-proof punch provided by the embodiment of the present application is shown in the figure.

[0028] In the figure: 1, punch support column; 101, cavity; 102, fixing pin; 2, riveting block; 201, first channel; 202, limiting groove; 3, guide pin; 301, mounting groove; 302, sliding groove; 4, elastic clamping piece; 401, rotating shaft; 402, pitch clamping plate; 403, protrusion; 5, first elastic piece; 6, tension adjusting mechanism; 601, adjusting piece; 602, second elastic piece; 603, push rod; 7, inductor. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] The punch for riveting a nut provided in the embodiments of the present application can solve the problem of nut installation error caused by the fact that the riveting punch in the prior art does not verify the nut specification.

[0031] As shown in Figs. 1 to 4 A punch for riveting a nut includes:

[0032] The punch support column 1 can be a cylindrical or square column, and an axial cavity 101 is arranged in the punch support column 1.

[0033] The riveting block 2 is sleeved at one end of the punch support column 1, and a first channel 201 is arranged in the riveting block 2.

[0034] The guide pin 3 is arranged in the cavity 101 at one end and extends out of the first channel 201 at the other end. The longitudinal section of the guide pin 3 is T-shaped, including a main body part and an upper end extension part. The guide pin 3 is provided with a mounting groove 301 penetrating the side wall thereof, and the mounting groove 301 is arranged on the main body part.

[0035] The elastic clamping piece 4 includes a rotating shaft 401 arranged in the mounting groove 301 and two pitch clamping plates 402. The two pitch clamping plates 402 are connected to the rotating shaft 401 in an interlaced manner. In the embodiment, the pitch clamping plate 402 is a flexible steel sheet, and one end of the pitch clamping plate 402 can be clamped into a large diameter of a screw thread.

[0036] The first elastic piece 5 is located between the guide pin 3 and the riveting block 2. In the embodiment, the first elastic piece 5 is a spring, which is sleeved on the main body part of the guide pin 3, and one end of the first elastic piece 5 is connected to the inner wall of the riveting block 2, and the other end of the first elastic piece 5 is connected to the extension part of the guide pin 3.

[0037] The riveting block 2 has a first position and a second position, and when in the first position, the first elastic member 5 is in a natural state, and the tooth spacing clamping plate 402 abuts against the first channel 201; when switched to the second position, the first elastic member 5 is in a compressed state, and the tooth spacing clamping plate 402 is reset to the extended installation groove 301.

[0038] In some embodiments, a sliding groove 302 is formed in the pilot pin 3 and communicates with the installation groove 301, and a tension adjusting mechanism 6 is further included, which abuts against the elastic clamping member 4 and is used for adjusting the tension of the elastic clamping member 4. The tension adjusting mechanism 6 includes an adjusting member 601, a second elastic member 602, and a push rod 603. In this application, the second elastic member 602 is a spiral spring, the adjusting member 601 is arranged in the cavity 101, one end of the push rod 603 penetrates through the sliding groove 302 and abuts against the elastic clamping member 4, and the other end is provided with the second elastic member 602 between the adjusting member 601.

[0039] In some embodiments, the adjusting member 601 is a screw plug, and the screw plug is threadedly connected to the punch support column 1.

[0040] In some embodiments, an angle α between the wall surface of the tension adjusting mechanism 6 and the axis of the punch support column 1, to which the elastic clamping member 4 abuts, is 30°≤α≤60°, and in this embodiment, α is 60°. By rotating the screw plug, the screw plug moves downward, compresses the second elastic member 602, drives the push rod 603 to abut against the upper end of the tooth spacing clamping plate 402, and makes the lower end of the push rod 603 downwardly inclined at an angle α arranged on the upper end of the tooth spacing clamping plate 402, so that the angle between the two tooth spacing clamping plates 402 becomes larger. Inversely rotating the screw plug, the screw plug moves upward, the pressure of the second elastic member 602 on the tooth spacing clamping plate 402 decreases, the lower end of the push rod 603 upwardly inclined at the angle α arranged on the upper end of the tooth spacing clamping plate 402, and the angle between the two tooth spacing clamping plates 402 becomes smaller. By adjusting the upward and downward movement of the adjusting member 601, the opening force between the two tooth spacing clamping plates 402 can be adjusted, so that the tooth spacing clamping plate 402 corresponding to the punch can adapt to different nuts.

[0041] In some embodiments, the tooth spacing clamping plate 402 is provided with a protrusion 403 at an end away from the installation groove 301, an angle β between the side wall of the protrusion 403 and the axis of the punch support column 1 is 30°≤β≤60°, and in this embodiment, β is 45°. The side wall of the protrusion 403 and the axis of the punch support column 1 are arranged at an upwardly inclined angle, which is convenient for pushing the nut upwardly and making the nut clamped on the protrusion 403.

[0042] In some embodiments, two fixing pins 102 are arranged on the side wall of the punch support column 1 in a circumferential direction, the fixing pins 102 are arranged in a radial direction of the punch support column 1, and a limiting groove 202 is formed in the riveting block 2 and matches the number and position of the fixing pins 102, so that the riveting block 2 can slide along the punch support column 1.

[0043] The convex die support column 1 side wall is fixedly provided with a sensor 7, the sensor 7 is a proximity sensor, is used for measuring the displacement of the riveting block 2, prevents the correct nut from being missed, the sensor 7 is connected with the equipment, the equipment does not work when no signal is received.

[0044] The workflow of the present application is as follows:

[0045] First, the workpiece to be processed is placed on the work station, the workpiece needs to be riveted two different specifications, the corresponding convex die is placed on the corresponding position of the workpiece, the guide pin 3 of the convex die has a fixed length, and the diameter is set according to the bottom hole of the M6 nut and the M8 nut, respectively, and the tooth spacing clamping plate 402 is made according to the tooth spacing of the nut.

[0046] In use, the operator takes the nut from the bottom of the guide pin 3, at this time, there are four cases in total:

[0047] The first case, for M6 and M8 nuts, due to the difference in diameter between the bottom hole and the guide pin 3, a natural error-proof mechanism is realized: the M6 nut cannot be fitted on the guide pin 3 due to the smaller bottom hole with a diameter of 5, and the riveting convex die guide pin 3 of the M8 nut has a diameter of 6.8, thereby avoiding the situation of mistakenly installing the M8 nut in the M6 position;

[0048] The second case, when the M8 nut is installed in the M6 position, the M8 nut can pass through the guide pin 3, and the tooth spacing clamping plate 402 of the M6 nut is opened with a distance of 6, and the bottom hole of the M8 nut is 6.8, due to the randomness of the concentricity during manual clamping, there is no situation that both tooth spacing clamping plates 402 are clamped (in the concentric case, the tooth spacing clamping plate 402 of the M6 nut is opened with a distance smaller than the bottom hole diameter of the M8 nut, and the nut directly falls due to its own weight), only one tooth spacing clamping plate 402 is occasionally hung on, under the action of the pushing force of the first elastic member 5 on the riveting block 2 and the gravity of the nut itself, the M8 nut will eventually fall off the elastic clamping member 4, the distance between the proximity sensor 7 exceeds the sensing range, the LED light on the proximity sensor 7 flashes, the equipment does not receive the signal and will not start, thereby realizing the error-proofing of the M8 nut mistakenly installed in the M6 position;

[0049] The third case, when the nut and the guide pin 3 are size-matched, but the nut is not tapped, the riveting block 2 is pushed upward, the tooth spacing clamping plate 402 contacts the inner wall of the nut, but the pushing force of the first elastic member 5 is greater than the force between the tooth spacing clamping plate 402 and the inner wall of the nut, the nut is also pushed out of the guide pin 3, thereby avoiding that the nut without tapping is installed on the product, affecting the quality of the finished product;

[0050] The fourth case, when the nut and the guide pin 3 size matching, push up the riveting block 2, the first elastic element 5 compression, the second elastic element 602 resistance to tooth spacing card board 402 upper end, the nut along the tooth spacing card board 402 protrusions 403 into the tooth spacing card board 402, tooth spacing card board 402 lower end of the installation slot 301, protrusions 403 card tooth diameter, the operator after hand, due to tooth spacing card board 402 and the nut inner wall force greater than the first elastic element 5 of the thrust, can not push out the nut, riveting block 2 has no downward movement, the distance between the proximity sensor 7 and riveting block 2 signal receiving normal.

[0051] When the nut is correctly installed into the punch, the sensor 7 signal lamp is normal, the device receives the signal normally, and works normally. Downward pressure on the punch, the nut is fixed on the part. Because the force between the nut and the part is greater than the force between the tooth spacing card board 402 and the nut, the punch moves upward, the tooth spacing card board 402 and the nut are separated, and the riveting of the nut is completed.

[0052] The application does not need to add additional mistake-proofing tools and mistake-proofing machines, has low cost, can eliminate the risk of artificial fatigue inspection, leads to product scrap and customer complaints, and can realize standardized manufacturing and copying to all riveting nut structures.

[0053] In the description of the application, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0054] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0055] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.

Claims

1. A press-in nut mistake-proofing punch characterized by comprising: It comprises: a punch support column (1) which is axially provided with a cavity (101); a riveting block (2) which is sleeved on one end of the punch support column (1) and is provided with a first channel (201); a pilot pin (3) which is provided in the cavity (101) at one end and extends out of the first channel (201) at the other end, and is provided with a mounting groove (301) penetrating through the side wall thereof; an elastic clamping piece (4) which is provided in the mounting groove (301) and has a plurality of pitch clamping plates (402); a first elastic piece (5) which is located between the pilot pin (3) and the riveting block (2); and the riveting block (2) has a first position and a second position, and when in the first position, the first elastic piece (5) is in a natural state, and the pitch clamping plates (402) abut against the first channel (201), and when switched to the second position, the first elastic piece (5) is in a compressed state, and the pitch clamping plates (402) are reset to extend out of the mounting groove (301).

2. The press-in nut mistake-proof punch of claim 1, wherein: the elastic clamping piece (4) comprises a rotating shaft (401) provided in the mounting groove (301) and two pitch clamping plates (402), and the two pitch clamping plates (402) are connected to the rotating shaft (401) in an interlaced manner.

3. The press-in nut mistake-proof punch of claim 1, further comprising a tension adjusting mechanism (6) which abuts against the elastic clamping piece (4) and is used for adjusting the tension of the elastic clamping piece (4).

4. The press-in nut mistake-proof punch of claim 3, wherein: the pilot pin (3) is provided with a sliding groove (302) which communicates with the mounting groove (301); the tension adjusting mechanism (6) comprises an adjusting piece (601), a second elastic piece (602) and a push rod (603), the adjusting piece (601) is provided in the cavity (101), one end of the push rod (603) penetrates through the sliding groove (302) and abuts against the elastic clamping piece (4), and the other end of the push rod (603) is provided with the second elastic piece (602) between the adjusting piece (601).

5. The press-in nut mistake-proof punch of claim 4, wherein: the adjusting piece (601) is a threaded plug which is threadedly connected to the punch support column (1).

6. The press-in nut mistake-proof punch of claim 3, wherein: an included angle between the wall surface of the tension adjusting mechanism (6) abutting against the elastic clamping piece (4) and the axis of the punch support column (1) is α, and 30°≤α≤60°.

7. The press-in nut mistake-proof punch of claim 2, wherein: the pitch clamping plates (402) are elastic steel sheets.

8. The press-in nut mistake-proof punch of claim 2, wherein: the pitch clamping plates (402) are provided with protrusions (403) at one end away from the mounting groove (301), and an included angle between the side wall of the protrusions (403) and the axis of the punch support column (1) is β, and 30°≤β≤60°. ​ 9. The punch for the press-in nut according to claim 1, characterized in that: A plurality of fixing pins (102) are arranged circumferentially along the side wall of the punch support column (1), and the fixing pins (102) are arranged radially along the punch support column (1), and the riveting block (2) is provided with limiting grooves (202) matching the number and position of the fixing pins (102).

10. The punch for the press-in nut according to claim 1, characterized in that: The inductor (7) is fixedly installed on the side wall of the punch support column (1), and the inductor (7) is used for measuring the displacement of the riveting block (2).

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