A kind of rivet connection pair without tail ring groove and riveting method thereof

Abstract

The invention discloses a rivet connection pair without a tail ring groove and a riveting method thereof. The connection pair comprises a rivet and a collar, wherein the rivet rod is provided with a nail head, a polished rod and a spiral lock groove in sequence along the longitudinal direction of the rivet rod, and the spiral lock groove has a thread groove which is screwed together with an internal thread; the rear side of the outer wall flange of the sleeve is provided with an outer polished surface section and an outer groove section in sequence, and the rear end of the inner wall of the sleeve is provided with an inner spiral lock groove which matches the spiral lock groove of the rivet. The riveting method comprises the following steps: the collar is tightened with the spiral lock groove of the rivet through the inner spiral lock groove, positioned, and the riveting tool is started for riveting. The rivet of the invention is only designed with a spiral lock groove which matches the collar, the inner part of the collar is designed with a part of the inner spiral lock groove, and the outer wall is designed with a groove for riveting; when in use, the collar can be screwed onto the rivet, and the collar and the rivet form a fastening connection structure through radial molding. The ring groove rivet connection pair of the invention has a shorter exposed length, which is conducive to lightweight design and more reasonable application arrangement of the component space structure.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting, in particular to the design and manufacture of a rivet fastener for connection, belonging to the riveting category (B21J) and fastener category (F16B) of metal machining. Background Art

[0002] In structural design, fastening connection is a frequently used component combination method. At the same time, the anti-loosening performance and reliability of fastening connection are required by various structures. The ring groove rivet connection technology, as a fastening connection technology with excellent anti-loosening performance and reliable connection, is being promoted and applied by various industries, and is gradually replacing traditional threaded connections in some fields.

[0003] In the application process, for some components that need to be installed with other parts after fastening and there are space restrictions or interference, the existing conventional ring groove rivet products seem to be somewhat powerless and cannot fully meet the use requirements. When using the pull-off type ring groove rivet connection pair, although there can be a shorter exposed part after riveting, the riveting process has a large impact, and more raw materials are used in manufacturing, resulting in great waste; when using the short-tail ring groove rivet connection pair, due to the existence of the short tail structure, the exposed part after riveting is longer than the pull-off type ring groove rivet and bolt, which is not conducive to saving space and lightweight design of components. In some design structures, it is necessary to use gas cutting or grinding wheels to cut off the short tail, which is not only time-consuming and labor-intensive, but also has certain safety hazards.

[0004] For example, in the field of solar photovoltaic equipment, with the continuous development of solar photovoltaic equipment technology, the main development trend of its technology is to continuously reduce the weight of related equipment, thereby significantly reducing the cost of solar photovoltaic equipment and improving the benefits of photovoltaic equipment. Therefore, the structural dimensions of related components are constantly optimized. For example, the aluminum alloy frame that fixes the battery panel is trying to use a stronger but thinner material. At the same time, the size of the C-shaped groove of the aluminum alloy frame is further reduced, which requires shorter ring groove rivets to meet its space requirements; for example, in order to reduce the damage of strong wind tension in the wild to solar photovoltaic equipment, after the installation of the solar photovoltaic shaft is completed, the battery panel is required to be installed as close to the shaft as possible. In the new photovoltaic technology, this distance is further shortened. Therefore, a ring groove rivet product with a shorter exposed length is also needed for fastening during battery installation.

[0005] The design and application of tailless ring groove rivets can effectively solve related problems, taking into account the advantages of break-off ring groove rivet connection pairs and short-tail ring groove rivets, with a shorter exposed length to avoid component interference, which is beneficial to the lightweight design of components. At the same time, it can effectively save raw materials and reduce product costs.

[0006] The tailless ring groove rivet connection pair can also be used for fastening connection solutions that have both anti-loosening performance requirements and space requirements after installation. For example, after the frame of some equipment is installed, it is often necessary to use a fastener shell to protect the interior. The use of tailless rivets can effectively reduce the space requirement between the shell and the frame, thereby reducing the size of the shell and reducing costs, and making the appearance of the entire machine more compact and beautiful. Summary of the invention

[0007] The present invention discloses a tailless ring groove rivet connection pair and a riveting method thereof in view of the deficiencies of the prior art. The purpose of the present invention is to provide a tailless ring groove rivet connection pair and a riveting method thereof for components with high space requirements during fastening and connection, with limited exposed height of fasteners, and with anti-loosening performance equivalent to that of ring groove rivets.

[0008] The present invention is achieved through the following technical solutions:

[0009] A rivet connection pair without a tail ring groove, comprising a rivet and a collar, characterized in that:

[0010] Along the longitudinal direction of the rivet rod, there are the nail head, the polished rod and the spiral lock groove in sequence; the spiral lock groove has a thread groove that is tightened with the internal thread;

[0011] The sleeve ring is composed of a flange at the front end and a sleeve connected to the flange; the rear side of the sleeve outer wall flange is successively an outer smooth surface section and an outer groove section, and the rear end of the sleeve inner wall is provided with an inner spiral locking groove matching the rivet spiral locking groove.

[0012] The length ratio of the outer smooth surface section and the outer groove section of the outer wall of the sleeve ring is: outer smooth surface section / outer groove section=0.5-2.

[0013] The non-contact surface of the flange is provided with a circular protrusion.

[0014] The outer groove on the outer wall of the sleeve ring is a spiral structure or an annular groove structure.

[0015] The riveting method using the tailless ring groove rivet connection pair of the present invention comprises the following steps:

[0016] S1. Pass the rivet through the prefabricated hole of the riveted part, and tighten the collar through the inner spiral lock groove and the spiral lock groove of the rivet;

[0017] S2. Insert the rivet and the collar into the riveting tool so that the end face of the collar contacts the positioning table inside the claw to complete the positioning; or use the riveting tool to automatically rotate the anvil and the claw to the end of the outer groove of the collar in the rivet assembly;

[0018] S3. Start the riveting tool, the anvil and the claw and the connection pair move relative to each other, so that the claw gradually holds the ring tightly, and when the anvil passes through the claw section, the claw presses the metal of the spiral lock groove section inside the ring, breaking the spiral fit of the inner wall and eliminating the gap of the spiral meshing part. The anvil continues to move forward, and the anvil begins to press the outer smooth section of the ring, so that the metal of the inner wall of the ring flows into the spiral lock groove on the rivet, and the sleeve part of the ring and the rivet form a metal plastic deformation locking structure without gap;

[0019] S4. The anvil continues to press the outer smooth surface of the ring until the set pressure is reached. The riveting tool automatically withdraws upon receiving the pressure signal, and the riveting is completed.

[0020] The clamping claw of the riveting tool of the present invention has a tooth profile matching the outer groove of the collar, and the ratio of the tooth profile height to the tooth profile height of the collar groove is 0.3 to 1. If the outer groove of the collar adopts a spiral groove structure, the clamping claw tooth profile is a spiral structure matching the outer groove of the collar.

[0021] The clamping claw is a split-petal clamping claw, and the number of petals is greater than or equal to two.

[0022] The usefulness of the invention: The tailless ring groove rivet connection pair of the invention comprises two components, a rivet and a collar. The rivet is only designed with a spiral lock groove that matches the collar. The collar is partially designed with an inner spiral lock groove, and the outer wall is designed with an outer draw groove for riveting. When in use, the collar is screwed onto the rivet, and radial molding is performed while pulling the collar with a special tool, so that the collar and the rivet form a non-loose fastening connection structure. The tailless ring groove rivet connection pair of the invention has a shorter exposed length, which reduces the possibility of interference with the connecting parts; the weight is reduced after the connection structure is simplified, which is conducive to lightweight design; the connection pair of the invention has good anti-loosening performance and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the rivet structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the ring structure of the present invention;

[0025] Figures 3 to 6 It is a schematic diagram of the riveting process of the present invention.

[0026] In the figure, 1 is a rivet, 1.1 is a nail head, 1.2 is a polished rod, 1.3 is a spiral lock groove, 2 is a collar, 2.1 is an outer polished surface, 2.2 is an outer groove, and 2.3 is an inner spiral lock groove. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0028] As shown in the figure, the connection pair of the present invention is composed of a rivet 1 and a collar 2. The rivet 1 is composed of a nail head 1.1, a polished rod 1.2, and a spiral lock groove 1.3 from front to back; the collar 2 includes a flange at the front end, a sleeve, and a circular protrusion arranged on the non-contact surface of the flange, wherein the rear side of the sleeve outer wall flange is sequentially composed of an outer polished surface section 2.1 and an outer groove section 2.2, and the rear end of the sleeve inner wall is provided with an inner spiral lock groove 2.3 matching the spiral lock groove 1.3 of the rivet 1.

[0029] The key component of the riveting tool is the gun head, which includes a clamping jaw and an anvil. The clamping jaw has a tooth profile that matches the outer groove 2.2 of the collar.

[0030] like Figure 1 As shown, the rivet 1 of the present invention comprises a rivet head 1.1, a polished rod 1.2, and a spiral locking groove 1.3. The spiral locking groove 1.3 is capable of cooperating with the spiral locking groove 2.3 in the collar 2 and forming a gap-free locking structure with the inner wall metal of the collar 2 during molding;

[0031] like Figure 2 As shown, the sleeve 2 of the present invention comprises a flange, a sleeve and a circular protrusion, wherein the front part of the sleeve outer wall is an outer smooth surface 2.1, the rear part is an outer groove 2.2, and the inner wall of the sleeve is provided with an inner spiral lock groove 2.3. The length ratio of the outer smooth surface 2.1 section and the outer groove 2.2 section of the outer wall of the sleeve 2 is: outer smooth surface section / outer groove section=0.5~2; the relationship between the outer diameter D of the outer smooth surface 2.1 section and the rivet diameter d is: D / d=1.4~1.8; the outer diameter D of the outer groove 2.2 section is l The relationship with the rivet diameter d is: l / d=1.2~1.8;

[0032] The claw teeth of the riveting tool of the present invention match the teeth of the outer groove of the collar and have a relatively low tooth height, providing conditions for molding the outer groove 2.2 of the collar. The claw is a petal structure with more than or equal to two petals, and each petal of the claw is designed with a tooth shape matching the outer groove 2.2 of the collar 2; when the outer groove 2.2 of the outer wall of the collar 2 is a spiral structure, the claw is matched with a spiral structure tooth shape.

[0033] like Figures 3 to 6 As shown, the specific riveting process is as follows:

[0034] 1. Pass the rivet 1 through the prefabricated hole of the riveted part, and tighten the collar 2 with the spiral locking groove 1.3 of the rivet 1 through the inner spiral locking groove 2.3;

[0035] 2. Insert the rivet 1 and the collar 2 into the special riveting tool, so that the end face of the collar 1 contacts the positioning table inside the claw to complete the positioning; or use the riveting tool to automatically rotate the anvil and the claw to the end of the outer groove of the collar in the rivet assembly;

[0036] 3. Start the special riveting tool, and the anvil, the clamping claw and the connection pair move relative to each other, so that the clamping claw gradually holds the collar 2, and when the anvil passes through the clamping claw section, the metal of the bolt lock groove 2.3 section in the collar 2 is molded by the clamping claw to break the spiral fit of the inner wall and eliminate the gap in the spiral part. The anvil continues to move forward and starts to mold the outer smooth surface 2.1 section of the collar 2, so that the metal of the outer smooth surface 2.1 section of the inner wall of the collar 2 flows into the spiral lock groove 1.3 on the rivet 1, forming a gapless metal plastic deformation locking structure;

[0037] 4. The anvil continues to mold the outer smooth surface 2.1 of the sleeve ring 2 until the set pressure is reached. The special riveting tool automatically withdraws upon receiving the pressure signal, and the riveting is completed.

[0038] The connection pair of the present invention is aimed at structural connections with anti-loosening performance requirements and space requirements in industrial machinery design. In general, when the anti-loosening performance requirements are not high, traditional bolts will be used for fastening and connection, and the looseness will be checked regularly and tightened in time to ensure that the normal operation of the equipment is not affected; this structural method will increase the later operation and maintenance costs of the equipment, especially for photovoltaic, wind power and other industry equipment in sparsely populated fields, which are difficult to repair; when the anti-loosening performance requirements are high, the ring groove rivet connection technology with better anti-loosening performance will generally be adopted, using a pull-off type ring groove rivet connection pair or a short-tail ring groove rivet connection pair, because the pull-off type ring groove rivet needs to be broken and discarded after the tail is broken, resulting in a large amount of material waste and high cost; and although the short-tail ring groove rivet does not need to break the tail, its retained short tail causes space waste, and in some implementation cases, tools such as electric grinding wheels are used to cut off the excess part and perform rust prevention treatment, which increases the workload of the operator. Although the ring groove rivet connection technology has good anti-loosening performance, it cannot take into account the space requirements, which is not conducive to the optimization of equipment structure and the reduction of cost.

[0039] The connection pair and the riveting method thereof of the present invention can reduce weight after the connection structure is simplified, which is conducive to lightweight design; the connection pair has good anti-loosening performance, is safe and reliable, and is easy to install and riveted.

Claims

1. A rivet connection pair without a tail ring groove, comprising a rivet and a collar, characterized in that: Along the longitudinal direction of the rivet rod, there are the nail head, the polished rod and the spiral lock groove in sequence; the spiral lock groove has a thread groove that is tightened with the internal thread; The sleeve ring is composed of a flange at the front end and a sleeve connected to the flange; the rear side of the sleeve outer wall flange is successively provided with an outer smooth surface section and an outer groove section, and the inner wall of the sleeve is provided with an inner spiral locking groove matching the rivet spiral locking groove.

2. The tailless ring groove rivet connection pair according to claim 1, characterized in that: The length ratio of the outer smooth surface section and the outer groove section of the outer wall of the sleeve ring is: outer smooth surface section / outer groove section=0.5-2.

3. The tailless ring groove rivet connection pair according to claim 2, characterized in that: The non-contact surface of the flange is provided with a circular protrusion.

4. The tailless ring groove rivet connection pair according to claim 2, characterized in that: The outer groove on the outer wall of the sleeve ring is a spiral structure or an annular groove structure.

5. A method for riveting a pair of rivets without a tail ring groove, characterized in that: The connecting pair according to any one of claims 1 to 4 is used, comprising the following steps: S1. Pass the rivet through the prefabricated hole of the riveted part, and tighten the collar through the inner spiral lock groove and the spiral lock groove of the rivet; S2. Insert the rivet and the collar into the riveting tool so that the end face of the collar contacts the positioning table inside the claw to complete the positioning; or use the riveting tool to automatically rotate the anvil and the claw to the end of the outer groove of the collar in the rivet assembly; S3. Start the riveting tool, the anvil and the claw and the connection pair move relative to each other, so that the claw gradually holds the ring tightly, and when the anvil passes through the claw section, the claw presses the metal of the spiral lock groove section inside the ring, breaking the spiral fit of the inner wall and eliminating the gap of the spiral meshing part. The anvil continues to move forward, and the anvil begins to press the outer smooth section of the ring, so that the metal of the inner wall of the ring flows into the spiral lock groove on the rivet, and the sleeve part of the ring and the rivet form a metal plastic deformation locking structure without gap; S4. The anvil continues to press the outer smooth surface of the ring until the set pressure is reached. The riveting tool automatically withdraws upon receiving the pressure signal, and the riveting is completed.

6. The riveting method for connecting a pair of rivets without a tail ring groove according to claim 5, characterized in that: The clamping claw of the riveting tool has a tooth profile that matches the outer groove of the collar, and the ratio of the tooth profile height to the tooth profile height of the outer groove of the collar is 0.3-1.

7. The riveting method for connecting a pair of rivets without a tail ring groove according to claim 6, characterized in that: The clamping claw is a split-petal clamping claw, and the number of petals is greater than or equal to two.

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