A kind of tool for testing the preload and pull-off force of blind rivets

Abstract

The present application discloses a tool for detecting the preload and pull-out force of a blind rivet in the field of tool detection technology, comprising a lower preload tool, a pressure sensor, an upper preload tool and a pull-out force tool, wherein the pressure sensor is arranged between the lower preload tool and the upper preload tool, a gap is arranged between the lower preload tool and the upper preload tool, and the lower preload tool and the upper preload tool are both provided with riveting holes arranged oppositely; the pull-out force tool is threadedly connected to the outer periphery of the upper preload tool, and the outer periphery of the pull-out force tool and the outer periphery of the lower preload tool are both provided with clamping grooves. The present application provides a tool capable of detecting the preload and pull-out force of a blind rivet.

Description

Technical Field

[0001] The invention relates to the technical field of detection tooling, and in particular to a tooling for detecting the preload force and pull-off force of a blind rivet. Background Art

[0002] Blind rivets are a type of single-sided rivet fasteners, widely used in aviation, aerospace, automobiles, ships and other fields. They are riveted by a rivet gun. During riveting, the rivet core rod is driven by the rivet gun to expand and deform the rivet body, thereby playing a tightening role. Currently, the more commonly used blind rivets include titanium alloy blind rivets, aluminum alloy blind rivets, and steel blind rivets. Blind rivets have the characteristics of wide riveting range, quick installation, large clamping force, good shock resistance, and good anti-loosening performance. The existing blind rivet preload and pull-off force detection tooling has the disadvantages of relatively complex structure, low detection efficiency, and insufficient detection data accuracy, which makes it difficult to meet batch detection requirements.

[0003] Referring to the prior art, a system for testing the preload of blind rivets with the publication number CN209764562U is disclosed, which includes a preload lower tooling, a pressure sensor, a preload upper tooling, a signal amplifier, a signal converter, and a display, wherein: the preload lower tooling and the preload upper tooling are respectively installed at the upper and lower ends of the pressure sensor, the lower part of the preload upper tooling is inserted into the pressure sensor, and there is a gap between the upper part of the preload lower tooling and the lower part of the preload upper tooling. When in use, the blind rivet is inserted into the through hole formed in the preload lower tooling and the preload upper tooling to complete the riveting, and the preload is contracted at the gap between the bottom surface of the preload upper tooling and the plane inside the preload lower tooling to form a preload, and the preload is contacted with the sensor through the large cylindrical bottom surface of the preload upper tooling and the upper surface of the preload lower tooling, and the preload is transmitted to the pressure sensor, and the pressure sensor outputs a voltage and current signal under pressure, and the signal is input into the software of the display through the signal amplifier and the signal converter to obtain the force value.

[0004] However, the above-mentioned prior art can only test the preload force of the blind rivet, but cannot test the pull-off force of the blind rivet. The electronic tensile testing machine is a commonly used component in this field. The electronic tensile testing machine, also known as the electronic tensile testing machine or the tensile testing machine, is a mechanical force testing machine used to perform mechanical property tests such as stretching, compression, bending, shearing, and peeling on metal and non-metal materials. It includes an upper chuck and a lower chuck. When in use, the two ends of the test piece are fixed to the upper chuck and the lower chuck respectively, and the upper chuck and the lower chuck move away from each other, thereby pulling the two ends of the test piece to stretch and test the pull-off force. To this end, the applicant has made improvements on the basis of the prior art and provided a tooling for the preload force and pull-off force of blind rivets. Summary of the invention

[0005] The present invention is intended to provide a tool for detecting the preload force and pull-out force of a blind rivet, so as to solve the problem that the prior art cannot assemble an electronic tensile testing machine to perform a pull-out force test.

[0006] In order to solve the above problems, the present invention provides the following technical solutions: A tool for detecting the preload and pull-out force of a blind rivet comprises a lower preload tool, a pressure sensor, an upper preload tool and a pull-out force tool, wherein the pressure sensor is arranged between the lower preload tool and the upper preload tool, a gap is arranged between the lower preload tool and the upper preload tool, the lower preload tool and the upper preload tool are both provided with riveting holes arranged oppositely, the pull-out force tool is threadedly connected to the outer periphery of the upper preload tool, and the outer peripheries of the pull-out force tool and the lower preload tool are both provided with clamping grooves.

[0007] Working principle and beneficial effects of the present invention: When the preload force is tested in this scheme, the pull-off force tooling is removed. The blind rivet passes through the rivet hole, and the pressure sensor is located between the lower preload force tooling and the upper preload force tooling. The rivet is riveted with a rivet gun. The gap provides the space required for the blind rivet to deform. During the riveting process, the lower preload force tooling and the upper preload force tooling squeeze the pressure sensor in opposite directions. The preload force value is displayed on the outside of the pressure sensor. After the preload force test is completed, the pull-off force tooling and the upper preload force tooling are assembled (that is, the pull-off force tooling is screwed into the upper preload force tooling), and then the upper chuck of the electronic tensile testing machine is clamped on the clamping groove on the outer periphery of the pull-off force tooling, and the lower chuck of the electronic tensile testing machine is clamped on the clamping groove on the outer periphery of the lower preload force tooling. The pull-off force tooling is moved by pulling the upper chuck, and the lower chuck pulls the lower preload force tooling to move, thereby forming a tensile force on both ends of the blind rivet, and then the pull-off force test data is obtained by the electronic tensile testing machine.

[0008] On the basis of the prior art, the present application adds a pull-off force tooling and a clamping groove, so as to be adapted to the lower chuck and the upper chuck of the tensile testing machine, thereby realizing the pull-off force detection of the blind rivet.

[0009] Optimally, the width of the gap is 0.5-1.0 cm. The gap is riveted with blind rivets.

[0010] Optimally, the clamping groove is specifically an annular groove, which facilitates the upper clamp or the upper clamp to clamp.

[0011] Optimally, the pressure sensor is connected to the signal amplifier via a wire, the signal amplifier is connected to the signal converter via a wire, and the signal converter is connected to the display via a wire.

[0012] Optimally, the clamping groove is sleeved with a rubber sleeve, so as to improve the connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a blind rivet preload and pull-off force detection tool without the handrail. Figure 2 for Figure 1 Structural diagram for detecting preload force; Figure 3 for Figure 1 Schematic diagram of the structure when testing the pull-off force; Figure 4 for Figure 3 Schematic diagram of the structure of the middle chuck. DETAILED DESCRIPTION

[0014] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: lower preload tooling 1, pressure sensor 2, upper preload tooling 3, pull-off tooling 4, chuck 5, pull rod 6, and half cylinder 7.

[0015] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions shown in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0016] Embodiment: A tool for detecting the preload and pull-off force of a blind rivet, such as Figure 1 As shown, it includes a lower preload tooling 1, a pressure sensor, an upper preload tooling 3 and a pull-off force tooling 4. The pressure sensor is arranged between the lower preload tooling 1 and the upper preload tooling 3. A gap is arranged between the lower preload tooling 1 and the upper preload tooling 3. The lower preload tooling 1 and the upper preload sleeve are both provided with riveting holes arranged relatively. The pull-off force tooling 4 is threadedly connected to the outer periphery of the upper preload tooling 3. The outer peripheries of the pull-off force tooling 4 and the lower preload tooling 1 are both provided with clamping grooves, which are specifically annular grooves.

[0017] like Figure 2 As shown, when the preload force is detected in this scheme, the pull-off force tooling 4 is removed. The blind rivet passes through the rivet hole, and the pressure sensor is located between the lower preload force tooling 1 and the upper preload force tooling 3. The rivet is riveted with a rivet gun. The gap provides the space required for the blind rivet to deform. During the riveting process, the lower preload force tooling 1 and the upper preload force tooling 3 squeeze the pressure sensor toward each other. The pressure sensor is connected to the signal amplifier with a wire, the signal amplifier is connected to the signal converter with a wire, and the signal converter is connected to the display with a wire. The preload force value is displayed on the display. This part of the content is the prior art, referring to a test system for detecting the preload force of blind rivets in CN209764562U.

[0018] like Figure 3 As shown, the pull-off force fixture 4 and the preload upper fixture 3 are assembled (ie, the pull-off force fixture 4 is screwed into the preload upper fixture 3), as shown in FIG. Figure 4As shown, the chuck 5 of the electronic tensile testing machine includes a pull rod 6 and two half cylinders 7. The pull rod 6 is driven by a cylinder, and the two half cylinders 7 are fixed by a screw. The chuck 5 includes an upper chuck 5 and a lower chuck 5. Then the upper chuck 5 is clamped on the clamping groove on the periphery of the pull-off force fixture 4, and the lower chuck 5 is clamped on the clamping groove on the periphery of the preload lower fixture 1. The upper chuck 5 pulls the pull-off force fixture 4 to move to the right, and the lower chuck 5 pulls the preload lower fixture 1 to move to the left, thereby forming a tensile force on both ends of the blind rivet, and then the pull-off force detection data is obtained through the electronic tensile testing machine. The electronic tensile testing machine uses a 50KN testing machine produced by Guangzhou Kunpeng Instrument Co., Ltd.

[0019] On the basis of the prior art, the present application adds a pull-out force tool 4 and a clamping groove, so as to be adapted to the lower chuck 5 and the upper chuck 5 of the tensile testing machine, thereby realizing the pull-out force detection of the blind rivet.

[0020] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

Claims

1. A tool for detecting the preload and pull-off force of blind rivets, characterized in that: It includes a lower preload tooling, a pressure sensor, an upper preload tooling and a pull-off force tooling, wherein the pressure sensor is arranged between the lower preload tooling and the upper preload tooling, a gap is arranged between the lower preload tooling and the upper preload tooling, and the lower preload tooling and the upper preload tooling sleeve are both provided with riveting holes arranged oppositely; the pull-off force tooling is threadedly connected to the outer periphery of the upper preload tooling, and the outer peripheries of the pull-off force tooling and the lower preload tooling are both provided with clamping grooves.

2. A blind rivet preload and pull-off force detection tool according to claim 1, characterized in that: The width of the gap is 0.5-1.0 cm.

3. A blind rivet preload and pull-off force detection tool according to claim 2, characterized in that: The clamping groove is specifically an annular groove.

4. A blind rivet preload and pull-off force detection tool as claimed in claim 3, characterized in that: The pressure sensor is connected to the signal amplifier through a wire, the signal amplifier is connected to the signal converter through a wire, and the signal converter is connected to the display through a wire.

5. A blind rivet preload and pull-off force detection tool according to any one of claims 1 to 4, characterized in that: The clamping groove is sleeved with a rubber sleeve.

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