Single-face rivet suitable for connection of different hole diameters

Abstract

The utility model discloses a single-face rivet suitable for connection of different hole diameters. The rivet is composed of a rivet cap head, a polish rod, a locking groove, a snapping groove and a tail tooth which are sequentially arranged. The lantern ring consists of a lantern ring cap head, a flange, a step section, a transition section, a deformation section and a straight section which are arranged in sequence; wherein the sleeve ring cap head is an extrusion plastic deformation area matched with the locking groove; the flange has a ring surface outer diameter larger than that of the mounting hole; the step section is connected with the deformation section through the transition section; the wall thickness and the outer diameter of the transition section are gradually reduced; the deformation section is a folding deformation area, and fastening connection is achieved through deformation and constraint of the straight edge section. According to the single-face rivet, the stress of the rivet is more uniform in the operation process of photovoltaic equipment, and the rivet can be prevented from being broken; by eliminating the gap between the rivet and the mounting hole, the rivet effectively prevents the problem of looseness caused by long-term vibration in the prior art, reduces thread machining of a rotating shaft seat casting, is more beneficial to improving efficiency and protecting environment, and reduces later maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of connection and fastening technology, and in particular to the field of metal fastener design and production technology. Specifically, it relates to a single-sided rivet suitable for connection of different hole diameters. Background Technology

[0002] The efficient operation of photovoltaic (PV) equipment relies heavily on trackers. The primary function of trackers is to adjust the angle of the PV modules in real time based on the angle of sunlight, maximizing the intensity of illumination. Trackers are typically connected to the PV equipment's rotating base using fasteners, with most PV systems currently employing high-strength bolts. The rotating base is usually a casting, with machined threaded through holes on its end face for tracker installation. However, due to significant dimensional deviations in the casting and the need for structural adjustments, the holes on the tracker must be much larger than the bolt diameter to ensure proper assembly. This leads to frequent bolt loosening and breakage during later operation. Summary of the Invention

[0003] This utility model discloses a single-sided rivet suitable for connecting different hole diameters, addressing the shortcomings of existing technologies. The purpose of this utility model is to provide a single-sided rivet with excellent connection performance, safety and reliability, convenient operation, high construction efficiency, and suitability for fastening connections with different hole diameters.

[0004] This utility model is achieved through the following technical solution:

[0005] A single-sided rivet suitable for connecting holes of different diameters includes a rivet and a collar, characterized in that: the rivet is composed of a rivet head, a smooth shank, a locking groove, a breakaway groove, and a tail tooth arranged in sequence; the collar is composed of a collar head, a flange, a stepped section, a transition section, a deformable section, and a straight edge section arranged in sequence; wherein, the collar head is a compression plastic deformation zone that mates with the locking groove; the flange has an outer diameter of the annular surface larger than that of the mounting hole; the stepped section is connected to the deformable section through the transition section, the wall thickness and outer diameter of the transition section gradually decrease; the deformable section is a folding deformation zone, and a fastening connection is achieved through deformation and constraint by the straight edge section.

[0006] Furthermore, the outer diameter of the stage is 1.2 to 1.5 times the outer diameter of the deformed section.

[0007] Furthermore, the outer diameter of the flange annulus is 1.8 to 2.5 times larger than the diameter of the mounting hole.

[0008] Furthermore, the transition section adopts a concave arc design, and the radius of the transition section arc is twice the difference between the outer diameter of the deformation section and the platform section.

[0009] The utility model discloses a single side rivet suitable for different aperture connection, single side rivet is provided with the stage of stepped diameter structure, and the stage of stepped diameter structure thickens the diameter of metal and compensates the too big gap of installation hole, and the too big gap can be eliminated through the plastic deformation of the stage of stepped diameter structure, so that the single side rivet can not be broken or loose after installation.

[0010] The utility model has the advantages that: compared with the prior art, the single side rivet has better fastening performance, and the stress of the single side rivet is more uniform during the operation of photovoltaic equipment, so that the single side rivet can be prevented from being broken; the single side rivet can effectively prevent the loosening problem of the prior art caused by long-term vibration, reduce the thread processing of the shaft seat casting, and be more conducive to improving efficiency and environmental protection, and reduce the maintenance cost in the later period. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a single side rivet schematic view of the utility model;

[0012] Figure 2 It is a single side rivet rod schematic view of the utility model;

[0013] Figure 3 It is a single side rivet sleeve ring schematic view of the utility model;

[0014] Figure 4 It is a schematic view of the section state after the installation of the prior art rivet;

[0015] Figure 5 It is a schematic view of the section state after the installation of the utility model rivet;

[0016] Figures 6 to 9 It is a schematic view of the installation process of the utility model rivet.

[0017] In the drawing, 1 is a rod, 2 is a sleeve ring, 3 is a prior art bolt, 4 is an installation hole, 1.1 is a rod cap, 1.2 is a light rod, 1.3 is a locking groove, 1.4 is a pull-off groove, 1.5 is a tail tooth, 2.1 is a sleeve ring cap, 2.2 is a flange, 2.3 is a stage, 2.4 is a transition section, 2.5 is a deformation section, 2.6 is a straight edge section, d is the diameter of the straight edge section, t is a conventional installation gap, t' is an improved installation gap, and R is the radius of the transition section arc. DETAILED DESCRIPTION

[0018] The utility model is further described in combination with specific implementation manners, and the specific implementation manners are further descriptions of the principles of the utility model, do not limit the utility model in any way, and the same or similar technologies of the utility model do not exceed the protection scope of the utility model.

[0019] Embodiment:

[0020] The present embodiment is suitable for single-sided rivet with different hole diameter connection for photovoltaic tracker installation. In the existing photovoltaic tracker installation process, in order to make the process easy to assemble and reduce the cost, the bolt hole is generally pre-cast on the cast shaft seat, and then the threaded hole on the cast shaft seat is formed by machining for assembly. The installation hole on the tracker generally adopts a large hole much larger than the diameter of the bolt to adapt to the deviation of the bolt hole on the cast shaft seat. During installation, the bolt matched with the bolt hole on the cast shaft seat is used to install and fasten the tracker. Such working conditions can cause the gap between the bolt and the installation hole on the tracker to deviate from the hole center, and when the tracker rotates with the shaft, the bolt needs to bear the shearing action, which can cause uneven stress of the bolt group and easily cause the bolt to break. In addition, during the operation of the photovoltaic equipment, the long-term action of wind load can cause the bolt to loosen under the long-term vibration working condition of the shaft and the tracker, which brings great inconvenience to the maintenance personnel.

[0021] As shown in Figure 1 , the present embodiment adopts a single-sided rivet with different hole diameter connection, which includes a rivet 1 and a sleeve ring 2 with a variable diameter step structure.

[0022] As shown in Figure 2 , the rivet 1 includes a rivet shank cap 1.1, a light shank 1.2, a locking groove 1.3, a pull-off groove 1.4, and a tail tooth 1.5.

[0023] As shown in Figure 3 , the sleeve ring 2 includes a sleeve ring cap 2.1, a flange 2.2, a step 2.3, a transition section 2.4, a deformation section 2.5, and a straight edge section 2.6.

[0024] The sleeve ring flange 2.2 has a larger annular outer diameter than the installation hole 4. The diameter of the flange 2.2 is 1.8-2.5 times the diameter d of the straight edge section, which can better provide a contact surface and ensure the fastening performance.

[0025] The sleeve ring step 2.3 has a significant change in outer diameter compared to the deformation section 2.5. The step 2.3 is connected to the deformation section 2.5 through the transition section 2.4. The outer diameter of the step 2.3 is 1.2-1.5 times the outer diameter d of the straight edge section 2.6, which can effectively reduce the gap between the rivet and the hole wall.

[0026] As shown in Figure 3As shown, the transition section 2.4 of the collar adopts a concave arc design, which reduces the difficulty of upsetting and avoids metal accumulation during installation; in general, the arc radius R is 2 times the diameter difference between the deformation section 2.5 of the collar and the stage 2.3. The wall thickness and outer diameter of the transition section 2.4 gradually decrease, forming a structure with constant inner hole diameter and gradually changing outer cylinder outer diameter. The large end of the transition section 2.4 is connected with the stage 2.3, and the small end is connected with the deformation section 2.5. The center of the arc of the transition section 2.4 is on the lower side of the arc contour, forming a structure with constant inner hole diameter and gradually changing outer cylinder outer diameter. This structure is beneficial to extrusion deformation and metal flow under the same force.

[0027] As shown in Figure 4 , Figure 4 is a schematic diagram of the cross-sectional state after the existing rivet is installed; the cross-sectional gap after the existing bolt is installed is large, and t is the gap between the outer diameter of the bolt and the hole of the tracker. Due to the very large gap, the bolt swings too much in the gap during work, which can easily cause fatigue fracture or looseness.

[0028] As shown in Figure 5 , Figure 5 is a schematic diagram of the cross-sectional state after the rivet of the utility model is installed, and the cross-sectional gap after the rivet of the utility model is installed is small. Under the combined action of the pulling force of the rivet during the drumming process and the anvil pushing force, the collar stage will be plastically deformed under the extrusion of the rivet rod and the inner hole of the tracker, and the metal of the stage will flow to a direction with smaller stress, thereby forming the filling effect as shown in the figure. After filling, the gap between the single-sided rivet and the hole can be effectively reduced to prevent fracture and looseness caused by the too large gap. In fact, the possible deformation can also be a meridional unequal wall thickness structure, but the metal can also flow to the inner hole to reduce the gap under the extrusion action.

[0029] Figures 6 to 9It is the rivet installation process schematic diagram of the utility model. During installation, the single-sided rivet of the utility model is passed through the installation hole on the tracking device and the pivot base, wherein the pivot base is smaller installation hole and the tracking device is larger installation hole, so that the 1 / 2 length of the single-sided rivet deformation area is exposed to the installation hole of the pivot base, and the rivet transition section or stage is in close contact with the tracking device installation hole or in the installation hole; then the special installation tool is used to exert axial tension load on the rivet tail tooth, and the anvil front end of the installation tool exerts extrusion and pushing action forward, the axial tension load is exerted on the rivet to make the straight edge section transmit the load to the deformation area, and make the deformation area drum up, under the anvil thrust and the dragging effect of the drum up, the stage is plastically deformed and extruded into the installation hole on the tracking device, when it is in the installation hole of the tracking device, i.e. the working condition is better, the stage can not be plastically deformed, and the close fit and smaller gap are formed. When the drum up section reaches the maximum under the action of the rivet axial tension, the anvil part of the special installation tool begins to extrude the sleeve ring cap, and until the anvil contacts the flange, finally the rivet anvil is pulled off at the pull-off groove to complete the riveting.

Claims

1. A single-sided rivet suitable for use in connection with different hole diameters, comprising a rivet, a collar, characterized in that: The rivet is composed of a rivet cap head, a light pole, a locking groove, a pull-off groove and a tail tooth arranged in sequence; the sleeve ring is composed of a sleeve ring cap head, a flange, a stage, a transition section, a deformation section and a straight edge section arranged in sequence; wherein the sleeve ring cap head is an extrusion plastic deformation area matched with the locking groove; the flange has an annular outer diameter greater than the installation hole; the stage is connected with the deformation section through the transition section, and the wall thickness and the outer diameter of the transition section are gradually reduced; the deformation section is a folding deformation area, and fastening connection is realized through deformation and the straight edge section.

2. The single-sided rivet suitable for connection of different hole diameters according to claim 1, characterized in that: The outer diameter of the stage is 1.2-1.5 times the outer diameter of the deformation section.

3. The single-sided rivet suitable for connection of different hole diameters according to claim 1, characterized in that: The annular outer diameter of the flange is 1.8-2.5 times greater than the diameter of the installation hole.

4. The single-sided rivet suitable for connection of different hole diameters according to claim 1 or 2 or 3, characterized in that: The transition section adopts a concave circular arc design, and the radius of the transition section circular arc is 2 times the difference between the outer diameters of the deformation section and the stage.

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