Riveting mechanism for riveting stud

Abstract

The invention provides a rivet pulling mechanism for a rivet stud. The rivet pulling mechanism comprises a mandrel and a rotating seat, a rotating seat through hole is formed in the rotating seat, and the mandrel is inserted into the rotating seat through the rotating seat through hole so as to be coaxial with the rotating seat; the core shaft comprises a tool connecting part and a shaft body which are coaxially arranged; the tool connecting part is used for being connected with a rivet pulling tool; the shaft body is provided with a core shaft inner hole, and the core shaft inner hole is provided with an internal thread used for being in threaded connection with the screw rod; the shaft body is provided with a step part, the outer diameter of the step part is smaller than the inner diameter of the riveting stud shell, and the inner diameter of the step part is larger than the outer diameter of the screw rod; the rotating seat comprises a rotating seat thread part and a rotating seat limiting part which are coaxially arranged; the threaded part of the rotating seat is provided with an external thread; and the rotary seat limiting part is provided with an annular limiting piece which is used for limiting the riveting stud shell flange. The device can be suitable for installing the riveting stud with the middle position of the screw coated with an anti-loosening or sealant, and the perpendicularity and concentricity of the installed riveting stud are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a rivet stud riveting mechanism. Background Art

[0002] In modern manufacturing, rivet studs are a common solution for adding high-strength threads to thin-walled workpieces or hollow profiles. They are easy to assemble, do not require reverse support and pressure, and can be used on a variety of metal materials, plastic products and even ceramic workpieces.

[0003] However, there is currently no ready-made rivet tool head that can be used for rivet studs with anti-loosening or sealant applied in the middle of the screw rod. In addition, when the screw rod of the rivet stud is long, it is difficult for the existing rivet tool head to control the concentricity and verticality of the front and back of the rivet. Since the gun head is prone to shaking and shifting during the riveting operation, it may cause eccentricity of the thread, resulting in position interference during final assembly, causing problems such as inability to install. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a rivet stud pulling riveting mechanism, which, through ingenious structural design, can not only meet the application of rivet studs coated with anti-loosening or sealing glue in the middle position of the screw, but also ensure the concentricity and verticality of the rivet studs before and after installation.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] A rivet stud riveting mechanism, used for riveting a rivet stud, the rivet stud comprising a screw, a rivet stud housing, and a rivet stud housing flange, the rivet stud riveting mechanism comprising a mandrel and a rotary seat;

[0007] The rotary seat is provided with a rotary seat through hole, and the core shaft is inserted into the rotary seat through the rotary seat through the rotary seat through hole so as to be coaxially arranged with the rotary seat;

[0008] The mandrel comprises a coaxially arranged tool connection part and a shaft body; the tool connection part is used to connect with a riveting tool; the shaft body is provided with a mandrel inner hole, and the mandrel inner hole is provided with an internal thread for threaded connection with the screw; the mandrel inner hole comprises an internal thread part and a smooth part; the internal thread part is provided with an internal thread for threaded connection with the screw; the inner wall of the smooth part is smooth, and the inner diameter is larger than the outer diameter of the screw;

[0009] The shaft body is provided with a step portion, the outer diameter of the step portion is smaller than the inner diameter of the rivet stud housing, and the inner diameter of the step portion is larger than the outer diameter of the screw rod;

[0010] The rotary seat comprises a rotary seat threaded portion and a rotary seat limiting portion which are coaxially arranged; the rotary seat threaded portion is provided with an external thread for connecting a riveting tool; the rotary seat limiting portion is provided with an annular limiting piece for limiting the flange of the rivet stud housing.

[0011] In the technical solution, by adopting the above-mentioned structural design, on the one hand, the concentricity of the rivet stud can be pre-checked before riveting, thereby achieving the purpose of checking the gauge; on the other hand, by the cooperation between the annular limiting portion of the rotary seat and the step portion of the mandrel, the shaking offset of the mandrel and the rivet stud can be reduced when riveting the rivet stud with a longer screw rod, thereby ensuring the concentricity and verticality of the rivet stud installation; it can also solve the problem that the rivet stud with anti-loosening or sealing glue applied in the middle position of the screw rod cannot be riveted and installed.

[0012] Preferably, the rotary seat through hole comprises an axle body hole and a step hole; the inner diameter of the axle body hole is 0.1-0.2 mm larger than the outer diameter of the axle body, and the inner diameter of the step hole is 0.1-0.2 mm larger than the outer diameter of the step portion.

[0013] In the present technical solution, by adopting the above-mentioned structural design, the through hole of the rotary seat can have a better limiting effect on the mandrel, further reducing the shaking and offset of the mandrel during the riveting operation, and improving the riveting effect.

[0014] Preferably, the end of the threaded portion of the rotary seat is chamfered.

[0015] In the technical solution, by adopting the above-mentioned structural design, the threaded connection efficiency between the rotary seat and the riveting tool can be improved.

[0016] Preferably, the rotating seat limiting portion is further provided with an annular groove and an elastic member, the annular limiting member can be slidably embedded in the annular groove, and the elastic member is located between the annular limiting member and the bottom of the annular groove.

[0017] In the present technical solution, by adopting the above-mentioned structural design, the height of the annular limiter exceeding the annular groove can be adaptively adjusted according to the height of the rivet stud housing flange, thereby improving versatility.

[0018] Preferably, a protruding slider is provided on the outer wall of the annular stopper, and a slider guide groove is provided on the inner wall of the annular groove, and the slider can be slidably embedded in the slider guide groove;

[0019] A limiting gasket is arranged at the end of the rotating seat limiting portion for closing the slide guide groove.

[0020] In the present technical solution, by adopting the above-mentioned structural design, the movement of the annular limiting member can be constrained and guided.

[0021] Preferably, a display groove is further provided on the outer side of the rotary seat limiting portion, for displaying the depth of the annular limiting portion embedded in the annular groove and the expansion and contraction amount of the core shaft during the pull riveting installation.

[0022] In the present technical solution, by adopting the above-mentioned structural design, the user can read the depth of the annular limiter embedded in the annular groove and the deformation of the rivet stud during the pull riveting installation, so as to know the deformation of the rivet stud during the pull riveting installation and then judge the installation quality of the rivet stud.

[0023] Preferably, the step portion is detachably connected to the shaft body.

[0024] In the present technical solution, by adopting the structural design described above, only the step portion needs to be replaced after the step portion is worn, thereby reducing the cost of parts and extending the service life of the core shaft body.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The rivet stud riveting mechanism provided by the present invention can solve the problem that the rivet stud coated with anti-loosening or sealing glue in the middle of the screw rod cannot be riveted and installed through the special mandrel and rotary seat matching structure design.

[0027] 2. The rivet stud pulling mechanism provided by the present invention can pre-check the concentricity of the rivet stud before installation through a special step portion design, thus playing a role of inspection.

[0028] 3. The rivet stud riveting mechanism provided by the present invention can limit the rivet stud and the mandrel through the design of the step portion and the annular limiter, and can reduce the shaking offset of the mandrel and the rivet stud during the riveting operation, thereby ensuring the verticality and concentricity after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 It is a structural schematic diagram of the rivet stud pulling mechanism and the rivet stud in the first embodiment;

[0031] Figure 2 is a schematic structural diagram of the mandrel described in the first embodiment;

[0032] Figure 3 It is a structural schematic diagram of the rotary seat described in the first embodiment;

[0033] Figure 4 It is a structural schematic diagram of the rotating seat described in the second embodiment;

[0034] Figure 5It is an exploded view of the rotary seat described in the second embodiment;

[0035] Figure 6 It is a structural schematic diagram of the rivet stud described in the first embodiment;

[0036] Figure 7 for Figure 1 Enlarged schematic diagram of part A.

[0037] The figure shows:

[0038] 1- mandrel; 11- tool connection part; 12- shaft body; 13- mandrel inner hole; 131- internal thread section; 132- smooth section; 14- step section;

[0039] 2-swivel seat; 21-swivel seat threaded portion; 22-swivel seat limiting portion; 23-swivel seat through hole; 231-shaft body hole; 232-step hole; 24-annular limiting member; 241-slider; 25-annular groove; 251-slider guide groove; 26-elastic member; 27-display groove; 28-limiting gasket;

[0040] 3- rivet stud; 31- screw rod; 32- rivet stud housing; 33- rivet stud housing flange. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] First Embodiment

[0045] This embodiment provides a rivet stud riveting mechanism, such as Figure 1 , Figure 2 , Figure 3 As shown, it is used to pull rivets on the rivet stud 3. The structure of the rivet stud 3 is as follows Figure 6 As shown, it includes a screw 31, a rivet stud housing 32, and a rivet stud housing flange 33. There is a gap between the screw 31 and the rivet stud housing 32. The rivet stud riveting mechanism provided in this embodiment includes a mandrel 1 and a rotary seat 2. The rotary seat 2 is provided with a rotary seat through hole 23. The mandrel 1 is inserted into the rotary seat 2 through the rotary seat through hole 23 and is coaxially arranged with the rotary seat 2.

[0046] As for the specific design of the mandrel 1, Figure 1 , Figure 2 , Figure 7 As shown, it includes a coaxially arranged tool connection part 11 and a shaft body 12. The tool connection part 11 is used to connect with the riveting tool. For example, a pin can be used to quickly connect the tool connection part 11 with the riveting tool. After the connection, the riveting tool can drive the mandrel 1 to rotate and retract through the tool connection part 11 to achieve the riveting action. The shaft body 12 is cylindrical, with a smooth outer surface, and its outer diameter is smaller than the inner diameter of the rotary seat through hole 23, so that the shaft body 12 can be smoothly inserted into the rotary seat through hole 23 to achieve the coaxial arrangement of the mandrel 1 and the rotary seat 2. A mandrel inner hole 13 is provided in the shaft body 12, and the mandrel inner hole 13 is provided with an internal thread, which is used to be threadedly connected with the screw 31 to achieve riveting. The shaft body 12 is also provided with a step portion 14, which is used to limit the screw 31. Specifically, the outer diameter of the step portion 14 is smaller than the inner diameter of the rivet stud shell 32, and the inner diameter of the step portion 14 is larger than the outer diameter of the screw 31, so that after the screw 31 is threadedly connected with the inner hole 13 of the core shaft, the step portion 14 is located in the gap between the screw 31 and the rivet stud shell 32, so that the concentricity of the rivet stud 3 before installation can be checked to achieve the purpose of inspection, and the activity of the rivet stud 3 during the riveting process can be limited, thereby improving the concentricity and verticality after installation.

[0047] Furthermore, if Figure 3 As shown, the rotary seat through hole 23 includes an axle body hole 231 and a step hole 232. The inner diameter of the axle body hole 231 is 0.1-0.2 mm larger than the outer diameter of the axle body 12, and the inner diameter of the step hole 232 is 0.1-0.2 mm larger than the outer diameter of the step portion 14, so that the rotary seat through hole 23 can limit the offset of the axle body 12 in the rotary seat through hole 23, thereby improving the concentricity and verticality of the rivet stud 3 after installation.

[0048] There may be a glue-coated area in the middle of the screw 31. In order to achieve the glue anti-loosening and sealing functions when the nut is subsequently matched, it is required that the glue state of the glue-coated area of ​​the screw 31 cannot be destroyed during the riveting installation. In order to protect the glue-coated area of ​​the screw 31, the inner hole 13 of the mandrel is further divided into an internal thread section 131 and a smooth section 132, wherein the internal thread section 131 is provided with an internal thread for threaded connection with the screw 31 to achieve the riveting action; the inner wall of the smooth section 132 is smooth, and the inner diameter is larger than the outer diameter of the screw 31. After the internal thread section 131 is threadedly connected with the screw 31, the glue-coated area of ​​the screw 31 is accommodated by the smooth section 132, so that the smooth section 132 can avoid the glue-coated area on the screw 31 to prevent the glue-coated area from being damaged during the riveting process.

[0049] As for the specific design of the rotating seat 2, Figure 3 , Figure 7 As shown, it includes a coaxially arranged rotary seat threaded portion 21 and a rotary seat limiting portion 22. Among them, the rotary seat threaded portion 21 is provided with an external thread for connecting with a riveting tool. The rotary seat limiting portion 22 is provided with an annular limiting member 24, and the inner diameter of the annular limiting member 24 is 0.1-0.2 mm larger than the outer diameter of the rivet stud housing flange 33, so that the annular limiting member 24 can wrap the rivet stud housing flange 33, limit its displacement during the riveting process, and thus limit the rivet stud housing flange 33. In this embodiment, the rotary seat limiting portion 22 and the annular limiting member 24 are integrally formed, but in other embodiments, the rotary seat limiting portion 22 and the annular limiting member 24 can be other connection relationships.

[0050] Furthermore, the end of the screw seat threaded portion 21 is provided with a chamfer to facilitate screwing in of the thread and to facilitate connection of the screw seat threaded portion 21 with a riveting tool.

[0051] The working principle of the rivet stud riveting mechanism provided in this embodiment is described below. When riveting operation is required, the shaft body 12 of the mandrel 1 is inserted into the rotary seat through hole 23 of the rotary seat 2, and the screw 31 is placed in the inner hole 13 of the mandrel and threadedly connected with the internal thread section 131. After the connection is completed, the rivet stud shell flange 33 is wrapped by the annular limiter 24, the step portion 14 is located in the gap between the rivet stud shell 32 and the screw 31, and the glue coating area of ​​the screw 31 is located in the smooth section 132 of the inner hole 13 of the mandrel. The riveting operation is started by driving the riveting tool. The annular limiter 24 and the step portion 14 can jointly limit the shaking offset of the mandrel 1 and the rivet stud 3, thereby ensuring the concentricity and verticality of the rivet stud 3 after the riveting operation is completed and the installation is completed.

[0052] By using the rivet stud riveting mechanism provided by this embodiment, it is possible to: first, through the special step portion design, the concentricity of the rivet stud can be pre-checked before riveting, thereby achieving the purpose of inspection. Second, through the cooperation of the annular limiting portion of the rotary seat and the step portion of the mandrel, the shaking offset of the mandrel and the rivet stud can be reduced when riveting the rivet stud with a longer screw, so that the rivet stud has better concentricity and verticality after installation. Third, further according to the outer diameter of the mandrel shaft body and the step portion, the inner diameter of the rotary seat through hole is designed accordingly, so that the rotary seat through hole can have a better limiting effect on the mandrel, further reduce the shaking offset of the mandrel during the riveting operation, and improve the riveting effect. Fourth, further through the design of the smooth section of the inner hole of the mandrel, the glue coating area on the screw can be better protected to prevent it from being damaged during the riveting operation. Fifth, through the chamfer design of the threaded portion of the rotary seat, the threaded connection efficiency of the rotary seat and the riveting tool is improved.

[0053] Second Embodiment

[0054] The present embodiment provides a rivet stud riveting mechanism, the structure of which is substantially the same as that of the rivet stud riveting mechanism described in the first embodiment, both of which include a mandrel 1 and a rotary seat 2. The difference is that the rotary seat limiting portion 22 and the annular limiting member 24 of the present embodiment have different structural designs, and the height of the annular limiting member 24 can be adaptively adjusted according to the height of the rivet stud housing flange 33, so that the riveting mechanism has a wider range of applications.

[0055] Specifically, if Figure 4 , Figure 5 As shown, the rotary seat limiting portion 22 in this embodiment includes an annular groove 25 and an elastic member 26. The annular limiting member 24 can be slidably embedded in the annular groove 25, and the elastic member 26 is located between the annular limiting member 24 and the bottom of the annular groove 25, so that the elastic member 26 can control the height of the annular limiting member 24 exceeding the annular groove 25. Specifically, when the elastic member 26 reaches the compression limit, the length of the elastic member 26 reaches the minimum value, and the height of the annular limiting member 24 exceeding the annular groove 25 is also the minimum; when the elastic member 26 is freely stretched, the length of the elastic member 26 reaches the maximum value, and the height of the annular limiting member 24 exceeding the annular groove 25 is also the maximum.

[0056] In order to limit the movement of the annular limiting member 24 in the annular groove 25, a protruding slider 241 is provided on the outer wall of the annular limiting member 24, and a slider guide groove 251 is provided in the annular groove 25. The slider 241 is slidably embedded in the slider guide groove 251, so that the annular limiting member 24 slides under the constraint of the slider guide groove 251. In addition, a limiting gasket 28 is detachably connected to the end of the rotary seat limiting portion 22, which can close the slider guide groove 251, so that the slider 241 can only slide inside the slider guide groove 251 and cannot be separated, thereby limiting the maximum height of the annular limiting member 24 that can extend out of the annular groove 25.

[0057] Furthermore, a display groove 27 is provided on the outer side of the rotary seat limit portion 24 to display the depth of the annular limit member 24 embedded in the annular groove 25, so as to facilitate the user of the mechanism provided in this embodiment to observe the movable distance of the annular limit member 24.

[0058] Furthermore, the step portion 14 is detachably connected to the shaft body 12, so that after the step portion 14 is damaged, the shaft body 12 and the tool connecting portion 11 can be retained, and only the step portion 14 needs to be replaced, thereby reducing parts costs and extending the service life of the shaft body 12 and the tool connecting portion 11.

[0059] On the basis of the beneficial effects described in the first embodiment, by using the rivet stud riveting mechanism provided in this embodiment, it is possible to further: First, by slidably embedding the annular limiter into the annular groove and providing an elastic member, the height of the annular limiter beyond the annular groove can be adaptively adjusted according to the height of the rivet stud housing flange, thereby improving versatility. Second, through the structural design of the slider, the slider guide groove, and the limiter, the movement of the annular limiter can be constrained and guided. Third, through the design of the display groove, it is convenient for the user to read the depth of the annular limiter embedded in the annular groove. Fourth, through the detachable design of the step portion and the shaft body, the service life of the mandrel shaft body can be extended and the cost of parts can be reduced.

[0060] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A rivet stud riveting mechanism, used for riveting a rivet stud, the rivet stud comprising a screw, a rivet stud housing, and a rivet stud housing flange, characterized in that: The riveting mechanism comprises a mandrel and a rotary seat; The rotary seat is provided with a rotary seat through hole, and the core shaft is inserted into the rotary seat through the rotary seat through the rotary seat through hole so as to be coaxially arranged with the rotary seat; The mandrel comprises a coaxially arranged tool connection part and a shaft body; the tool connection part is used to connect with a riveting tool; the shaft body is provided with a mandrel inner hole, and the mandrel inner hole comprises an internal threaded part and a smooth surface part; the internal threaded part is provided with an internal thread for threaded connection with the screw; the inner wall of the smooth surface part is smooth, and the inner diameter is larger than the outer diameter of the screw; The shaft body is provided with a step portion, the outer diameter of the step portion is smaller than the inner diameter of the rivet stud housing, and the inner diameter of the step portion is larger than the outer diameter of the screw rod; The rotary seat comprises a rotary seat threaded portion and a rotary seat limiting portion which are coaxially arranged; the rotary seat threaded portion is provided with an external thread for connecting a riveting tool; the rotary seat limiting portion is provided with an annular limiting piece for limiting the flange of the rivet stud housing.

2. The rivet stud riveting mechanism according to claim 1, characterized in that: The rotary seat through hole comprises an axle body hole and a step hole; the inner diameter of the axle body hole is 0.1-0.2 mm larger than the outer diameter of the axle body, and the inner diameter of the step hole is 0.1-0.2 mm larger than the outer diameter of the step portion.

3. The rivet stud riveting mechanism according to claim 1, characterized in that: The end of the threaded portion of the rotary seat is provided with a chamfer.

4. The rivet stud riveting mechanism according to claim 1, characterized in that: The rotating seat limiting part is also provided with an annular groove and an elastic member. The annular limiting member can be slidably embedded in the annular groove, and the elastic member is located between the annular limiting member and the bottom of the annular groove.

5. The rivet stud riveting mechanism according to claim 4, characterized in that: The outer wall of the annular stopper is provided with a raised slider, the inner wall of the annular groove is provided with a slider guide groove, and the slider can be slidably embedded in the slider guide groove; A limiting gasket is arranged at the end of the rotating seat limiting portion for closing the slide guide groove.

6. The rivet stud riveting mechanism according to claim 4, characterized in that: A display groove is also provided on the outer side of the rotary seat limiting portion, which is used to display the depth of the annular limiting portion embedded in the annular groove and the expansion and contraction amount of the core shaft after riveting.

7. The rivet stud riveting mechanism according to claim 1, characterized in that: The step portion is detachably connected to the shaft body.

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