Riveting gun and rivet positioning mechanism thereof

Abstract

The utility model relates to the technical field of riveting guns, in particular to a riveting gun and a rivet positioning mechanism thereof. Wherein the rivet positioning mechanism comprises an upper rivet connecting seat, an upper sliding block, a lower chuck, a compression spring and a torsion spring; an upper rivet through hole and an upper riveting disc groove which are communicated with each other are formed in the upper sliding block; a riveting core groove and a lower riveting disc groove which are communicated with each other are formed in the lower chuck; the upper rivet through hole, the upper riveting disc groove, the rivet core groove and the lower riveting disc groove form a rivet positioning cavity which enables the axis of a clamped rivet to coincide with the axis of the gun head assembly channel. According to the utility model, the rivet enters the rivet feeding through hole in a way that the rivet disc is forward, then is clamped by the upper sliding block and the lower chuck, and is suspended on the axial lead of the channel of the gun head assembly in a way that the rivet disc is forward; at the moment, the axis of the gun head assembly, the axis of the rivet and the axis of the gun head assembly channel almost coincide, so that the rivet is sleeved with the gun head assembly in a horizontal state, and the rivet clamping phenomenon is reduced.

Description

Technical Field

[0001] This utility model relates to the field of rivet gun technology, and more specifically, to a rivet gun and its rivet positioning mechanism. Background Technology

[0002] Rivet guns are used for fastening and riveting various metal sheets and pipes in the manufacturing industry. They are currently widely used in the riveting of electromechanical and light industrial products such as automobiles, aviation, railways, refrigeration, elevators, switches, instruments, furniture, and decoration. Rivet guns were developed to address the shortcomings of welding thin metal sheets and pipes, such as the easy melting of nuts and stripping of internal threads. They eliminate the need for tapping internal threads and welding nuts during riveting, providing strong, efficient, and convenient connections.

[0003] The structure of a rivet gun is generally as shown in the disclosure of patent CN115921750A, comprising, from left to right, a gun head assembly, a rivet base, a rivet mounting assembly, and a pull-off assembly. During the research and development process, the inventors discovered that the rivet gun in patent CN115921750A had a problem with rivet positioning during the rivet mounting process; see its appendix. Figure 5 When the upper rivet assembly (specifically the guide nozzle 221) pushes the rivet forward into the gun head assembly (specifically the rivet feeder 34), the rivet is in an inclined state (rivet head end high, rivet core end low) in the second upper rivet through hole 12, which sometimes causes the rivet to be unable to be smoothly put into the gun head assembly, resulting in a rivet jamming phenomenon. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rivet positioning mechanism to solve the technical problem that the rivet cannot be inserted into the gun head assembly in a horizontal state, thereby reducing the phenomenon of rivet jamming.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A rivet positioning mechanism includes an upper rivet connecting seat with a gun head assembly channel, an upper slider slidably disposed within the upper rivet connecting seat, a lower chuck hinged to the upper rivet connecting seat and used to clamp the rivet in cooperation with the upper slider, a compression spring located within the upper rivet connecting seat and used to drive the upper slider to slide towards the lower chuck, and a torsion spring hinged to the upper rivet connecting seat and used to drive the lower chuck to rotate towards the upper slider; one end of the compression spring abuts against the upper rivet connecting seat, and the other end abuts against the upper slider; one end of the torsion spring abuts against the upper rivet connecting seat, and the other end abuts against the lower chuck; the upper slider has an upper rivet through hole and an upper rivet groove that communicate with each other, and the lower chuck has a rivet core groove and a lower rivet groove that communicate with each other; the upper rivet through hole, the upper rivet groove, the rivet core groove, and the lower rivet groove form a rivet positioning cavity that makes the axis of the clamped rivet coincide with the axis of the gun head assembly channel.

[0007] Optionally, a rivet throwing notch is formed at the bottom of the through hole, which is used to throw the rivet core into the rivet core groove.

[0008] Optionally, the lower chuck is provided with a rivet core baffle to prevent the rivet core from separating from the rivet plate.

[0009] Optionally, both the upper and lower rivet grooves are semi-circular grooves, and the rivet core groove is a V-shaped groove.

[0010] Optionally, the upper nail connector is provided with a nail feeding tube joint that communicates with the upper nail through hole.

[0011] Optionally, the sides of the upper slider and the lower chuck are both configured as guide slopes to facilitate the gun head assembly driving the upper slider and the lower chuck to release the rivet.

[0012] A rivet gun includes a gun head assembly, the aforementioned rivet positioning mechanism, and a break-off assembly; the front end of the gun head assembly is fixedly connected to the upper rivet connecting seat, and its rear end is fixedly connected to the break-off assembly.

[0013] Optionally, the gun head assembly includes a telescopic cylinder, in which a telescopic piston and a gun core piston are slidably sleeved, and brake pistons that are movably engaged with the telescopic piston are provided on both sides of the telescopic cylinder.

[0014] In summary, this utility model has the following beneficial effects: the rivet enters the upper rivet through hole with the rivet disc facing forward, and is then held by the upper slider and the lower chuck, and suspended on the axis of the gun head assembly channel with the rivet disc facing forward; at this time, the axis of the gun head assembly, the axis of the rivet, and the axis of the gun head assembly channel almost coincide, thereby allowing the rivet to be inserted into the gun head assembly in a relatively horizontal state, thus reducing the jamming phenomenon. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the rivet positioning mechanism in this utility model;

[0016] Figure 2 This is a side view of the rivet positioning mechanism in this utility model;

[0017] Figure 3 This is the front view of the rivet positioning mechanism in this utility model;

[0018] Figure 4 yes Figure 3 Sectional view at section AA;

[0019] Figure 5 This is a schematic diagram of the upper slider in this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the lower chuck in this utility model;

[0021] Figure 7 This is a structural schematic diagram of the rivet gun in this utility model;

[0022] Figure 8 This is a front view of the rivet gun in this utility model;

[0023] Figure 9 yes Figure 8 Sectional view of section BB;

[0024] Figure 10 yes Figure 8 Sectional view at section CC;

[0025] Figure 11 This is an exploded view of the rivet gun in this utility model. Detailed Implementation

[0026] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] This utility model provides a rivet positioning mechanism, such as Figure 1-11 As shown, the assembly includes an upper rivet connector 1 with a gun head assembly channel 11, an upper slider 2 slidably disposed within the upper rivet connector 1, a lower collet 3 hinged to the upper rivet connector 1 and used to clamp the rivet in cooperation with the upper slider 2, a compression spring 4 located within the upper rivet connector 1 and used to drive the upper slider 2 to slide towards the lower collet 3, and a torsion spring 5 hinged to the upper rivet connector 1 and used to drive the lower collet 3 to rotate towards the upper slider 2; one end of the compression spring 4 abuts against the upper rivet connector. The upper slide block 2 is abutted against the upper nail connecting seat 1 at one end and against the lower chuck 3 at the other end. The upper slide block 2 has an interconnected upper nail through hole 21 and upper rivet groove 22. The lower chuck 3 has an interconnected rivet core groove 31 and lower rivet groove 32. The upper nail through hole 21, upper rivet groove 22, rivet core groove 31 and lower rivet groove 32 form a rivet positioning cavity that makes the axis of the clamped rivet coincide with the axis of the gun head assembly channel 11.

[0031] Specifically, the right end of the upper nail connecting seat 1 is fixedly connected to the telescopic cylinder body 61, and its lower end has a horizontally arranged gun head assembly channel 11, which is the same as the telescopic piston 62 housed in the gun head assembly 6; the upper end of the upper nail connecting seat 1 has a cavity for installing the compression spring 4 and sliding the upper slider 2; the upper nail connecting seat 1 and the upper slider 2 are provided with mutually compatible limiting structures to prevent the upper slider 2 from falling off the upper nail connecting seat 1. The lower clamp 3 is hinged to the lower end of the upper nail connecting seat 1 through a pin, and the torsion spring 5 is sleeved on the pin. The torsion spring 5 drives the lower clamp 3 to rotate upward and thus press against the upper slider 2. The upper rivet through hole 21 is obliquely arranged on the upper slider 2, and its lower end is connected to the upper rivet plate groove 22. The bottom of the upper rivet through hole 21 is an open rivet throwing notch 211. The gap of the rivet throwing notch 211 is larger than the diameter of the rivet core to throw the rivet core part into the rivet core groove 31. The rivet core groove 31 is a V-shaped groove to facilitate the placement of rivets with different rivet core diameters. The upper rivet plate groove 22 and the lower rivet plate groove 32 are both semi-circular grooves, which together form a circular groove for positioning and placing the rivet plate part of the rivet. By setting the relative size and position of the upper rivet plate groove 22, the lower rivet plate groove 32 and the rivet core groove 31, the rivet positioning cavity can fix the rivet in a horizontal arrangement (the axis of the rivet is collinear with the axis of the gun head assembly channel 11).

[0032] During installation, under the action of the external feeding mechanism, the rivet enters the upper rivet through hole 21 with the rivet disc facing forward, and is then held by the upper slider 2 and the lower chuck 3, and suspended on the axis of the gun head assembly channel 11 with the rivet disc facing forward. At this time, the axis of the gun head assembly 6, the axis of the rivet, and the axis of the gun head assembly channel 11 almost coincide, so that the rivet is inserted into the gun head assembly 6 in a relatively horizontal state, thereby reducing the jamming phenomenon.

[0033] Furthermore, the lower chuck 3 is provided with a rivet core baffle 33 for preventing the rivet core from separating from the rivet plate.

[0034] like Figure 1-5 As shown, considering that the rivet is composed of a rivet disc and a rivet core, when the rivet is quickly thrown from an inclined state to a horizontal state, the rivet core may be thrown off the rivet disc. Therefore, a rivet core baffle 33 is installed at the front end of the lower chuck 3.

[0035] Furthermore, the upper nail connector 1 is provided with a nail feeding tube connector 12 that communicates with the upper nail through hole 21.

[0036] like Figure 1-5 As shown, the nail feeder 12 is a flexible hose connector that is installed at an angle on the upper nail connector 1, with its through hole coinciding with the upper nail through hole 21 that has slid down to the lowest point.

[0037] Furthermore, the sides of the upper slider 2 and the lower chuck 3 are both configured as guide slopes to facilitate the gun head assembly 6 driving the upper slider 2 and the lower chuck 3 to loosen the rivets.

[0038] like Figure 1-5 As shown, the right side of the upper slider 2 and the right side of the lower clamp 3 are both guide slopes. When the gun head assembly 6 slides to the left, the gun head assembly 6 drives the upper slider 2 to slide upward, and drives the lower clamp 3 to rotate downward, so that the rivet can be fitted into the gun head assembly 6.

[0039] This utility model also provides a rivet gun, as shown in Figures 7-11, including the aforementioned rivet positioning mechanism, gun head assembly 6, and break-off assembly 7. The gun head assembly 6 includes a telescopic cylinder 61, a telescopic piston 62, a gun core piston 63, a brake piston 64, and a pneumatic-hydraulic handle 65. The break-off assembly 7 includes a hydraulic cylinder 71, a hydraulic piston 72, a pull tube 73, a vacuum generator 74, a vacuum sleeve 75, and a return spring 76.

[0040] The left end of the telescopic cylinder 61 is fixedly connected to the upper nail connecting seat 1, and its right end is fixedly connected to the hydraulic cylinder 71. The telescopic piston 62 and the gun core piston 63 are both slidably connected to the hydraulic cylinder 71, and the telescopic piston 62 is fitted with the gun core piston 63. The left end of the telescopic piston 62 is fixedly installed with the gun head top cylinder 621, and the left end of the gun core piston 63 is installed with a three-claw plate 631, a three-claw sleeve 632, a three-claw top cylinder 633, a vacuum tube 6331, and a spring for pushing the three-claw top cylinder 633 to press against the three-claw plate 631. The structure and connection relationship between the three-claw plate 631, the three-claw sleeve 632, the three-claw top cylinder 633, and the vacuum tube 6331 can be found in the upper nail assembly and gun head assembly in patent CN115921750A. The structure and connection relationship between the hydraulic cylinder 71, hydraulic piston 72, pull tube 73, vacuum generator 74, vacuum sleeve 75 and return spring 76 can be found in the pull-off assembly in patent CN115921750A.

[0041] The following combination Figure 7-11 The working steps of the rivet gun are explained below:

[0042] (1) Initial state: The gun head top cylinder 621 has no rivets, and the three-claw plate 631 is in the open state; the telescopic piston 62 and the gun core piston 63 are both located at the leftmost end of the telescopic cylinder 61; high-pressure gas is introduced into the right side of the telescopic cylinder 61; the entire gun head is extended to its maximum length; the brake piston 64 locks the telescopic piston 62. (Note: When the telescopic piston 62 and the gun core piston 63 are pressed together by the gas pressure, the conical surface at the tail of the front gun head top cylinder 621 will push open the three three-claw plates 631, and the three claws are in the open state.)

[0043] (2) Pressing the trigger: After pressing the trigger 651, the pneumatic-hydraulic booster handle 65 pressurizes the high-pressure hydraulic oil, which pushes the hydraulic piston 72 backward. The hydraulic piston 72 pulls the gun core piston 63 backward through the pull tube 73, and the three-jaw plate 631 backward, completing the rivet pulling action. Because it is the first rivet pulling, the gun head top tube 621 does not have a rivet yet. (During this process, there is always high-pressure gas on the right side of the telescopic cylinder 61.) Then the hydraulic oil is depressurized, the return spring 76 pushes the hydraulic piston 72 to return to its original position, and the high-pressure gas pushes the gun core piston 63 to return to its original position.

[0044] (3) At the same time, the upper slider 2 moves downward under the action of the compression spring 4, and the lower clamp 3 swings upward under the action of the torsion spring 5. The two combine to form a closed passage with the feeding tube, and then the rivet can fly over along this closed passage.

[0045] (4) Blowing a rivet: The riveting machine blows a rivet over and passes through the feeding tube and the upper rivet through hole 21 to the positioning position. The rivet is blocked by the gap of the upper slider 2. Due to inertia, the rivet core will pass through the rivet throwing notch 211 of the round hole of the upper slider 2. The rivet core is thrown down and positioned in the V-shaped rivet core groove 31 of the lower clamping block 3. This achieves the positioning of the rivet core.

[0046] (5) Riveting: High-pressure gas is introduced into the right side of the telescopic cylinder 61 and released from the left side. The entire telescopic piston 62 and the gun core piston 63 move forward, driving the gun head top cylinder 621 forward. The tail of the rivet is inserted into the middle of the gun head top cylinder 621. The gun head top cylinder 621 pushes open the upper slider 2 and the lower clamp 3, taking the rivet out, completing the rivet installation, and waiting for the next trigger signal. When the telescopic piston 62 and the gun core piston 63 move forward, the brake piston 64 simultaneously releases air and moves forward, just enough to lock into the groove of the telescopic piston 62. In this rivet installation step, the telescopic piston 62 and the gun core piston 63 move forward directly without waiting or depressurization, which can greatly improve the speed of the rivet installation action and achieve high-speed rivet installation.

[0047] (6) Align the workpiece to be riveted and press trigger 651 to pull the rivet. Brake piston 64 locks telescopic piston 62 to prevent it from retracting, providing support force when pulling the rivet; high-pressure hydraulic oil enters along the pipeline, pushing hydraulic piston 71 backward; hydraulic piston 71 pulls gun core piston 63 backward through pull tube 73; three-jaw sleeve 632 pulls three-jaw plate 631 backward; three-jaw plate 631 closes after disengaging from gun head top cylinder 621, pulling the rivet tail backward, finally breaking it off and riveting the workpiece. Among them, the design of double brake pistons 64 located on both sides of telescopic cylinder 61 to brake telescopic piston 62 overcomes the problems of single brake structure causing telescopic piston 62 to shift to one side, easy air leakage, and inaccurate rivet core positioning. Brake piston 64 is driven by compressed gas (releasing telescopic piston 62), and resets by spring (locking telescopic piston 62) during reset.

[0048] (7) When the hydraulic oil is depressurized, the return spring 76 pushes the hydraulic piston 72 to reset, and the high-pressure gas pushes the gun core piston 63 forward. The three-claw plate 631 presses against the conical surface at the rear of the gun head top cylinder 621 and opens. The broken nail rod is sucked away by the vacuum suction and ejected from the rear end along the passage of the vacuum tube 6331 in the center of the gun. Here, the suction is generated by the principle of the jet-type vacuum generator 74, that is, the Laval nozzle principle. A high-speed airflow is ejected backward, generating a vacuum suction at the left end of the gun head. For a detailed explanation of the principle, please refer to the description of patent CN115921750A.

[0049] (8) Repeat steps 3-7 above in a cyclical manner to achieve automatic rivet pulling.

[0050] In summary, the latest rivet positioning mechanism provided by this utility model has a simple structure, small size, light weight, and accurate positioning, which can meet the high-speed working requirements of rivet guns.

[0051] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A rivet positioning mechanism, characterized in that, The device includes an upper rivet connector with a gun head assembly channel, an upper slider slidably disposed within the upper rivet connector, a lower collet hinged to the upper rivet connector and used to clamp the rivet in cooperation with the upper slider, a compression spring located within the upper rivet connector and used to drive the upper slider to slide towards the lower collet, and a torsion spring hinged to the upper rivet connector and used to drive the lower collet to rotate towards the upper slider. One end of the compression spring abuts against the upper rivet connector, and the other end abuts against the upper slider. One end of the torsion spring abuts against the upper rivet connector, and the other end abuts against the lower collet. The upper slider has an interconnected upper rivet through hole and an upper rivet slot, and the lower collet has an interconnected rivet core slot and a lower rivet slot. The upper rivet through hole, the upper rivet slot, the rivet core slot, and the lower rivet slot form a rivet positioning cavity that makes the axis of the clamped rivet coincide with the axis of the gun head assembly channel.

2. The rivet positioning mechanism according to claim 1, characterized in that, The bottom of the through hole is formed with a rivet throwing notch, which is used to throw the rivet core into the rivet core groove.

3. The rivet positioning mechanism according to claim 1, characterized in that, The lower chuck is equipped with a rivet core baffle to prevent the rivet core from separating from the rivet plate.

4. The rivet positioning mechanism according to claim 1, characterized in that, Both the upper and lower rivet grooves are semi-circular grooves, while the rivet core groove is a V-shaped groove.

5. The rivet positioning mechanism according to claim 1, characterized in that, The upper nail connector is equipped with a nail feeding tube joint that communicates with the upper nail through hole.

6. The rivet positioning mechanism according to claim 1, characterized in that, Both the side of the upper slider and the side of the lower chuck are designed as guide slopes to facilitate the gun head assembly driving the upper slider and the lower chuck to release the rivet.

7. A rivet gun, characterized in that, It includes a gun head assembly, a rivet positioning mechanism as described in any one of claims 1-6, and a pull-off assembly; the front end of the gun head assembly is fixedly connected to the upper rivet connecting seat, and its rear end is fixedly connected to the pull-off assembly.

8. The rivet gun according to claim 7, characterized in that, The gun head assembly includes a telescopic cylinder, in which a telescopic piston and a gun core piston are slidably sleeved. Brake pistons that are movable and engage with the telescopic piston are provided on both sides of the telescopic cylinder.

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