Core-pulling rivet section levelness measuring base capable of adjusting distance between supporting legs

Abstract

The utility model relates to the technical field of core-pulling rivets, in particular to a core-pulling rivet section levelness measuring base capable of adjusting the spacing of supporting legs, which comprises a mounting seat, a digital display dial indicator is arranged on the mounting seat, at least two guide rails are fixedly mounted on the side wall of the mounting seat, the guide rails are uniformly arranged on the side wall, and the guide rails are slidably sleeved with inward bent supporting legs. And the tail end of the inwards-bent supporting leg is in contact with the nail head surface of the core-pulling rivet. The tail end of the inwards-bent supporting foot is bent in the sliding direction of the guide rail, the bending direction faces the installation base, the tail end of the supporting foot is located at the bottommost portion of the inwards-bent supporting foot, and the technical problem of levelness measurement of the cross section of a core rod of a plurality of types of flat-head core-pulling rivets is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of core-pulling rivets, in particular to a core-pulling rivet cross-section flatness measuring base with adjustable support leg spacing. Background Art

[0002] Blind rivets are fasteners used for single-sided riveting. They can be used for single-sided riveting in areas with limited structures and are widely used in aerospace, automobile and shipbuilding. After the blind rivets are formed, the quality of the rivet forming can be judged by the forming of the upsetting head and the core rod and pressure ring on the rivet head surface. During the forming process of the blind rivets, the middle core rod is pulled out and broken, and then removed. This breaking and removal process has a certain impact on the flatness of the core rod section of the blind rivets. Whether the concave and protruding values ​​of the core rod section meet the requirements is particularly critical when judging the connection quality; the flatness of the section affects the fixing strength of the blind rivets. If the section is not flush, it may cause uneven stress distribution at the riveting point, thereby affecting the overall fixing force. The flatness of the section will also affect the durability of the blind rivets. Uneven sections are more prone to fatigue fracture when subjected to repeated stress or vibration.

[0003] There are many types of rivet heads, which can be roughly divided into flat cone head rivets, countersunk head rivets, and semicircular head rivets. For different installation methods of rivet head surfaces, the flatness measurement of the core rod section after the rivet is formed is different. The existing measurement of the flatness of the core rod section after the rivet is formed usually uses a fixed three-claw support with a probe-type digital display dial indicator for measurement.

[0004] However, the three-claw support that relies on the mounting surface of the core-pulling rivet cannot be placed on a board structure with a small area or an uneven mounting surface, and cannot measure the cross-sectional flatness of the core-pulling rivet installed on the board structure; the operating space of the fixed three-claw support is also limited, and the measuring range is limited by the size of the fixed three-claw support; and the forming requirement of the core-pulling rivet is the flushness of the core rod cross-section with the rivet head surface. The fixed three-claw support cannot directly act on the rivet head surface measurement. When facing a rivet head surface that is not flush with the mounting board surface, a secondary comparative measurement is required. Utility Model Content

[0005] The purpose of the present application is to provide a base for measuring the cross-section flatness of a core pull-out rivet with adjustable support leg spacing, which solves the technical problem of measuring the cross-section flatness of core rods of various types of flat-head core pull-out rivets.

[0006] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0007] A base for measuring the cross-section flatness of a core-pulling rivet with adjustable leg spacing comprises a mounting seat, on which a digital dial indicator is arranged, at least two guide rails are fixedly mounted on the side wall of the mounting seat, the guide rails are evenly arranged on the side wall, inward-bending legs are slidably sleeved on the guide rails, and the leg ends of the inward-bending legs are in contact with the nail head surface of the core-pulling rivet.

[0008] Preferably, the end of the inward-curved support leg is bent along the sliding direction of the guide rail, with the bending direction toward the mounting seat, and the end of the support leg is located at the bottom of the inward-curved support leg.

[0009] Preferably, a mounting hole is provided at the center of the mounting seat, a digital dial indicator is placed in the mounting hole, a connecting piece is fixedly installed on the probe shaft end of the digital dial indicator, and the mounting hole is quickly connected to the connecting piece fixed on the digital dial indicator.

[0010] Preferably, the digital dial indicator includes a probe, a guide hole is provided through the center of the mounting seat, and the probe is slidably mounted in the guide hole.

[0011] Preferably, the linear extension direction of the guide rail is perpendicular to the probe axis direction of the digital dial indicator.

[0012] The technical solution of the present application has at least the following advantages and beneficial effects:

[0013] Through the inward-bending support legs whose distance can be adjusted through the guide rail, the core-pulling rivets with different sizes of rivet heads can be measured, which increases the measurement range. The inward-bending structure of the support legs can make the measurement surface of the rivet head smaller, which can be suitable for smaller types of core-pulling rivets;

[0014] The inner-bent legs act directly on the rivet head surface instead of the mounting plate surface of the rivet, so that when measuring different types of rivets, there will be no difference in measuring height due to different mounting methods of the rivets. The flushness can be obtained through only one measurement without the need for a second differential measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 The figure is a schematic diagram of the structure for adjusting the spacing between the inner curved legs of the device.

[0017] Figure 3 The figure is a schematic diagram of the structure of the mounting base of the device having multiple guide rails.

[0018] Figure 4 It is a schematic diagram of the structure of the inner curved support leg of the device.

[0019] In the figure: 1-mounting base; 2-digital dial indicator; 3-guide rail; 4-inwardly bent support foot; 11-guide hole; 21-connecting piece. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. If the terms "center", "upper", "lower", "inner", "outer", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the figure, or the orientation or position relationship in which the product of the application is usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. It should also be noted that unless otherwise clearly specified and limited, if the terms "set", "install", and "connect" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] Example

[0023] During the installation and forming process of the core-pulling rivet, the middle core rod will be pulled out, causing the rivet to deform and fix the board surface, and then the core rod will break and be removed. This breaking and removal process has a certain influence on the flatness of the core rod section of the core-pulling rivet. Whether the depression and protrusion values ​​of the core rod section meet the requirements is particularly critical when judging the connection quality. The existing measurement of the flatness of the core rod section after the core-pulling rivet is to use a fixed three-claw support placed on the installation board surface, and then cooperate with a probe-type digital display dial indicator to measure the flatness of the core rod section. For core rod sections of different heights, it is also necessary to make a differential measurement with the installation board surface.

[0024] For the self-plugging rivets with non-planar head surface, such as round head rivets, this type of rivet has lower strength and generally has low requirements on the cross section; while for the self-plugging rivets with flat head surface, such as flat cone head rivets and countersunk head rivets, this type of rivet has higher strength, and its core rod cross section has a certain influence on the strength of the rivet, so it is necessary to measure the flatness of the core rod cross section.

[0025] Please refer to Figure 1-Figure 4 The utility model provides a base for measuring the flatness of a cross-section of a core-pulling rivet with adjustable support leg spacing, comprising a mounting base 1, a digital dial indicator 2, a guide rail 3, and an inward-bending support leg 4.

[0026] Furthermore, a mounting hole is provided at the center of the mounting base 1 , and a connecting piece 21 is fixedly provided at the probe shaft end of the digital dial indicator 2 , and the digital dial indicator 2 is quickly fixed to the mounting hole through the connecting piece 21 .

[0027] Specifically, the connecting piece 21 on the digital dial indicator can be connected to the mounting hole by means of a thread, or can be quickly connected to the mounting hole by means of an elastic rubber plug or magnetic attraction. The quick disconnection method facilitates the replacement of the digital dial indicator 2 with probes of different lengths, and the flushness measurement of the core rod sections at different height planes relative to the nail head surface; a through guide hole 11 is provided at the center of the mounting seat 1, and the probe of the digital dial indicator 2 extends from the guide hole. The guide hole 11 can ensure the positioning accuracy of the probe, and can also indirectly protect the probe shaft from being damaged by external collision.

[0028] Furthermore, at least two guide rails 3 are fixedly installed on the side wall of the mounting base 1, and the guide rails 3 are evenly arranged on the side wall. The straight extension direction of the guide rails 3 is perpendicular to the probe axis direction of the digital dial indicator 2, and an inward-bending support leg 4 is slidably sleeved on the guide rail 3, and the end of the inward-bending support leg 4 contacts the nail head surface of the core-pulling rivet; when the nail head surface is not a plane, the end of the inward-bending support leg 4 contacts the mounting plate surface of the core-pulling rivet.

[0029] Specifically, the inward-bending leg 4 is composed of a sleeve and a leg, and the sleeve is slidably connected to the guide rail 3, so that the inward-bending leg 4 moves on the guide rail 3, changing the landing point of the inward-bending leg 4; the leg bends inward toward the probe 11 of the central guide hole of the mounting seat 1, and the end of the bent leg is still located at the bottom of the leg, contacting the nail head surface or the mounting plate surface.

[0030] When the inward-bent leg 4 slides through the guide rail 3 to abut against the side wall of the mounting seat 1, the end of the bent leg is located directly below the mounting seat 1 and abuts against the probe axis in the guide hole 11 of the mounting seat. This is the minimum plane range that the inward-bent leg 4 can measure.

[0031] The operating principle of the device is: before measuring, the device is placed on a flat surface to clear the reading of the digital dial indicator 2, and then the spacing of the inward-bending legs 4 is adjusted according to the actual size range of the nail surface to be measured, so that the inward-bending legs 4 act on the nail head surface after forming, and the probe of the digital dial indicator 2 acts on the cross-section of the core rod. The reading on the digital dial indicator 2 is the flushness of the core rod cross-section and the nail head surface.

[0032] Preferably, the relative position of the nail head surface and the cross-section of the internal core rod of the countersunk core-pulling rivet is fixed, and the inward-bent support leg 4 directly acts on the nail head surface, so that the relative position of the inward-bent support leg 4 and the probe is fixed, so that the inward-bent support leg 4 is not placed on the mounting plate surface, and the measuring device will not need to perform multiple measurements as the countersunk depth of the countersunk core-pulling rivet on the mounting plate surface changes, and then the measured values ​​are subtracted to detect the flushness; the device only needs to perform one measurement, and the dial indicator reading is the flushness, and no difference is required.

[0033] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the present invention, and the scope of the present invention is defined by the attached claims.

Claims

1. A base for measuring the flatness of the cross section of a core-pulling rivet with adjustable leg spacing, characterized in that: The invention comprises a mounting seat (1), on which a digital dial indicator (2) is arranged, and at least two guide rails (3) are fixedly mounted on the side wall of the mounting seat (1), and the guide rails (3) are evenly arranged on the side wall, and an inward-bending support leg (4) is slidably sleeved on the guide rail (3), and the support leg end of the inward-bending support leg (4) contacts the nail head surface of the core-pulling rivet; The end of the inward-bending support leg (4) is bent along the sliding direction of the guide rail, with the bending direction facing the mounting seat (1), and the end of the support leg is located at the bottom of the inward-bending support leg (4).

2. The cross-section flushness measuring base of a core-pulling rivet with adjustable support leg spacing according to claim 1, characterized in that: A mounting hole is provided at the center of the mounting seat (1), a digital dial gauge (2) is placed in the mounting hole, a connecting piece (21) is fixedly mounted on the probe shaft end of the digital dial gauge (2), and the mounting hole is quickly disconnectably connected to the connecting piece (21) fixed on the digital dial gauge (2).

3. The cross-section flatness measuring base of a core-pulling rivet with adjustable support leg spacing according to claim 1, characterized in that: The digital display dial gauge (2) comprises a probe, a guide hole (11) is provided through the center of the mounting seat (1), and the probe is slidably mounted in the guide hole (11).

4. The cross-section flatness measuring base of a core-pulling rivet with adjustable leg spacing as claimed in claim 1, characterized in that: The linear extension direction of the guide rail (3) is perpendicular to the probe axis direction of the digital dial indicator (2).

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