SU773742A1 - Unit for joining glass-plastic rod with metalling tip and method of manufacturing same - Google Patents

Description

The invention relates to a technique for the manufacture of insulating structures made of polymeric materials based on fiberglass for high-voltage power lines and in high-voltage apparatus. A joint assembly is known in which the connection of the smooth end of a rod with metal reinforcement is provided by bolting the two parts together. Finisher, superimposed on the end of the fiberglass l. The joint with the split tip does not have high mechanical strength, since -, between metal and fiberglass, mainly due to friction. Reduce the mechanical strength of the site also contribute to the grooves on the fiberglass, reducing the cross section of the rod. The connection assembly is known, in which the glass plastic rod is passed through an axisymmetric metallic tip having an opening in the form of a reverse cone 2. The end of the rod is split by a conic-circular insert. A curing resin is poured into the gaps of the split end, which can fill the gaps between the core and the tip. However, the device is difficult to manufacture metal reinforcement and the value of the mechanical load at the beginning of the creep of the steroid from the tip is low. The closest in technical essence is the junction of the suspension insulator, the upper insulating part of which is made with a circular, axially decreasing cross-section 3J. This part is covered with metal fittings (tip) having a cylindrical outer surface. The tip has a blind hole, the diameter of which at the entrance is equal to the diameter of the rod, and the rest of it is somewhat larger. The connection of the tip with the insulating element is carried out by means of a binder, cured in the hole of the tip. In order to obtain sufficient strength of the connection, the reduction in the cross section of the rod should occur according to an exponential law.

However, obtaining such a shape of the rod end is associated with considerable technical difficulties. The diameter of the reduced cross section is assumed to be 0.8 of the diameter of the rod, and the area of this section is 0.64 of the original area of the rod. Consequently, the mechanical strength of the joint only by reducing the cross section of the rod is 64% of the strength of the rod.

The purpose of the invention is to increase the mechanical strength of the joint and simplify the manufacturing technology of the assembly.

This goal is achieved by the fact that the mating surfaces of the tip and the rod have an elliptical shape, gradually converting from the middle of the joint to the edge into a cylindrical one, the tip being made in the form of two flattened truncated cones, facing each other by large bases, connected to each other by a flattened cylinder and has on the outer surface two plane-parallel faces; before pouring the binder, the tip and the rod are heated to the softening temperature of the binder rod, the tip is filled with m in its hole binder and rod inserted therein opressovshayut between two plane-parallel plates and vscherzhivayut heated under pressure to cure the binder.

Heating the rod to the softening temperature of the binder allows crimping without destroying the rod, shaping the tip hole, sealing and firmly sticking the rod in the hole of the rod.

When crimping (crimping) a tip with a rod inserted in it between two plane-parallel plates, for example on a press, and because the tip before crimping has a complex shape, indicated earlier, the surface of the tip opening and the stem flatten out, gradually turning from the middle of the combi- nation to the edges in the cylindrical one, with the dimensions of the axes transverse

sections of these forms, determined from the condition of the constant cross-sectional area of the rod, resulting in a “Double wedge connection of the rod

with a tip.,

FIG. 1 shows a fiberglass rod connection unit with a metal tip, a section; in fig. 2 view A in FIG. one; in fig. 3 shows a section BB in FIG. 1, in FIG. 4 shows a section B-B in FIG. one; in fig. 5 is a section of YYD in FIG. one; in fig. 6 - metal tip before crimping with a partial cut; in fig. 7 is a view A of FIG. 6; in fig. 8 is a section E-E of FIG. 6

The joint assembly has a metal tip 1 and a fiberglass rod 2 pressed into its opening, and, in addition, in conjunction, they have an adhesive bond with a binder (in Figure 1, the adhesive bond is indicated by a symbol). The mating surfaces of the tip and the rod have an elliptical shape (Fig. 3), gradually converting from the middle of the joint to the edges (Fig. 4) into a cylindrical shape (Fig. 5). The tip in the joint assembly is embodied in the form of two flattened truncated cones (Figs. 1-5) connected by large bases by means of a flattened cylinder. On the surface of the tip there are two plane-parallel faces (Figs. 1, 3, 4), which are obtained in the process of crimping between heated plates 3 and 4 of Figs. 1, 3-5), due to flattening of the tip and the fluidity of its material.

Before crimping, the tip is made in the form of two straight circular truncated cones a and b (Fig. 6-8), facing each other with large bases and interconnected by means of cylinder C and has a blind cylindrical hole.

The tip is made from various materials, for example steel or bronze.

As a rod, for example, fiberglass of the SPP-EA type trademark according to technical conditions TU16 / 503.139-35 is used.

The crimping process is as follows.

The end of the fiberglass rod and the tip are preheated to the softening temperature of the bonding fiberglass, the binder is poured into the tip of the tip, the rod 5 is inserted into the hole, then the tip is poured into the hole with the binder and the rod is inserted into it in a heated state. plane-parallel heated plates, such as a press, and withstand pressure until cured (polymerization binder. The temperature of the preheating of the tip and the rod depends on the composition For example, for fiberglass on the basis of a binder from epoxy-Dianova resin ED-2O or ED-22 according to GOST 1O587-62: isomethyltetrahydrophthalic anhydride according to TU38 103.149-72 and the accelerator of the HOSPO brand TU-6-14-15-27-74 , heating is carried out at 200-205 Ci for 3-5 minutes (depending on the cross section of the rod). The pressing unit is kept under pressure equal to the determination pressure. The holding time depends on the composition of the connecting rod, its cross section and the temperature of the heated plates. For example, for a sterling binder based on the above, with a rod diameter of 10-15 mm and a temperature of 18O plates, the holding time is 4-6 minutes. For example, a binder, the composition of which is indicated for a fiberglass rod, is used as a binder for pouring into the hole of the tip. The table shows comparative data of mechanical strength with various versions of the joint unit. For all the options, glass-plastic rods with a diameter of 12 mm (TU 16-5OZ. 139-35) with a discharge load of 12500 kgf and a tip of steel 45 were used. 42 Continuation of the table Connection of a 11800 rod with a puff of 2050 crimping threads (suggested) 12150 How can be seen from the table, a variant of the connection of fiberglass with a metal tip, which is the subject of the HacTosuuero invention, gives the greatest indicators of mechanical strength and stability of the results. In this embodiment, the strength of the joint assembly is close to that of fiberglass. Formula-Shade Shield 1. A fiberglass rod junction assembly with a metal tip, containing a fiberglass rod with a metallic, CMI tip attached to its end, using a cured. binder, characterized by the fact that, in order to increase the mechanical strength of the joint and simplify the fabrication of the assembly, the mating surfaces of the tip. and the stem have an elliptical shape that converts from the middle of the joint to the edge into a cylindrical one. two flattened truncated cones, facing each other by large bases, interconnected by means of a flattened cylinder and having two plane-parallel faces on the outer surface. , 2. A method of manufacturing a fiberglass rod connection unit with a metal tip according to claim 1, wherein a binder is poured into the hole of the tip, a rod and a valve are inserted, and the binder, prior to pouring the binder, is preheated to temperature spreading the binder rod, the tip with the binder poured in, its opening and the rod inserted in it - are pressed between two plane-parallel heated plates and held under pressure until cured no binder.

77737428

Sources of information, 2. Patent Switzerland Cg 571267,

taken into account during examination. H 01 B 19/00, 1974.

1. US patent No. 3514150,3. German Patent K 2122463

cl. 287-124, 1977. 21 C 13/01, 1971.

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Claims (1)

The connection unit has a metal tip 1 and a fiberglass rod 2 pressed into its hole, in addition, in conjunction they have an adhesive connection using a binder (in Fig. 1, the adhesive connection is indicated by a symbol). The mating surfaces of the tip and the rod have an elliptical shape (Fig. 3), which gradually passes from the middle of the joint to the edges (Fig. 4) into a cylindrical (Fig. 5). The tip in the connection node is made in the form of two tapered truncated cones (Fig. 1-5), 30 connected by large bases by means of a tapered cylinder. On the surface of the tip there are two plane-parallel faces (Figs. 1, 3, 4), which are obtained during the crimping process between the heated plates ³⁵ 3 and 4 ^ of Fig. 1, 3-5), due to the flattening of the tip and the fluidity of its material. Before crimping, the tip is made in the form of two straight circular truncated cones a and b (Figs. 6-8), facing each other with large bases and interconnected by means of cylinder C and has a blind cylindrical hole. ⁴⁵ . The tip is made of various materials, for example, steel or bronze. A fiberglass reinforced plastic of the profile grade SPP-EA is used as a core for the example ₅₀ according to the technical specifications TU16 / 503.139-35. The crimping process is as follows. The end of the fiberglass rod and the tip are preheated to the softening temperature of the binder fiberglass, the binder is poured into the hole of the tip, the rod is inserted Table continuation 773742 into the hole, then the tip with the binder poured into its bore and inserted into it in the heated state is pressed between two plane-parallel heated plates, for example a press, and kept under pressure until the binder cures (polymerizes). The preheating temperature of the tip and rod depends on the composition of the binder. For example, for fiberglass based on a binder made of an epoxy-diane resin ED-20 or ED-22 according to GOST 10587-62: isomethyl tetrahydrophthalic anhydride according to TU38103.149-72 and an accelerator of the XOS-1 brand according to TU-6-14-15-2-2- 74, heating is carried out at 200-205 ° Ci for 3-5 minutes (depending on the cross section of the rod). The pressed unit is maintained at a pressure equal to the pressure of the crimping. The exposure time depends on the composition of the connecting rod, its cross section and the temperature of the heated plates. For example, for a rod based on the * binder specified above, with a rod diameter of 10-15 mm and a plate temperature of 180-185 ° C, the exposure time is 4-6 minutes. As a binder for pouring into the hole in the tip, for example, a binder is used, the composition of which is indicated for the base of the fiberglass core. The table shows comparative data on mechanical strength for various designs of the joint. For all options, fiberglass rods with a diameter of 12 mm 'were used (according to TU16-503.139-35), having a breaking load of 12500 kgf, and a tip made of steel 45. Connection Characteristics 11800 Connection of the rod to the tip by crimping (proposed) 12050 12150 As can be seen from the table, the option of connecting fiberglass with a metal tip, representing the subject of the present invention, gives the greatest indicators of mechanical strength and stability of the results. With this option is close to Breaking force, kgf