Quick double-brake self-locking type strain clamp
Technical field
The invention discloses a kind of quick double-brake self-locking type strain clamp, be applied in the power industry, the wire erection strain insulator stringing terminal in defeated, the distribution overhead power line.
Background technology
At present; The strain clamp that uses on China's power circuit is to be that main ferromagnetic material is processed with malleable cast iron basically; Because strain clamp constitutes a closed magnetic loop around lead, under the action of alternating magnetic field that current in wire produces, in strain clamp, produce magnetic hysteresis loss and eddy current loss.Statistics shows according to investigations, and the loss that is produced by gold utensil in defeated, the distribution accounts for the 0.01-0.03% of transmission line capability, though in recent years; Adopted the line hardware of hydraulic in the power circuit construction, though also reduced the loss of magnetic hysteresis, eddy current, it needs to use hydraulic test and the generating equipment supporting with it in installation process; Equipment manufacturing cost is high; Hard transportation particularly in area construction with a varied topography, is brought great difficulty to the workmen.And, cause the significant wastage of gold utensil and lead easily in case the compacting completion is on-dismountable.What is more important, the scene that completion is installed does not possess test condition, does not know whether conform with the rules requirement, and brings very big workload and operating hidden danger to operation maintenance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of quick double-brake self-locking type strain clamp, and this strain clamp is simple in structure, and volume is little, in light weight, and adopts the bidirectional locking structure, and lead locking is more firm.
For overcoming the above problems; The concrete technical scheme of the utility model is following: a kind of quick double-brake self-locking type strain clamp; Comprise conical tube, reaction spring, folder and U-bolt; Two groups of four parts about described folder is divided into, the first curve folder, the second curve folder, the 3rd curve folder, the 4th curve folder, the first curve folder and the second curve folder become conical tube after merging; Its excircle cooperates with the inwall of conical tube, is provided with the first dovetail boss at the bottom of the vertebra after it merges; The 3rd curve folder and the 4th curve folder become conical tube after merging, and its excircle cooperates with the inwall of conical tube, and the vertebra top after it merges is provided with the second dovetail boss; Be provided with the folder contiguous block in the centre of two groups of folders, the both ends of the surface of folder contiguous block are provided with orthogonal first dovetail groove and second dovetail groove, and wherein the first dovetail boss cooperates with first dovetail groove, and the second dovetail boss cooperates with second dovetail groove; At the bottom of the vertebra of conical tube, also be provided with pipe plug, and, between pipe plug and folder, be provided with reaction spring with marking closely screw; Outer wall at conical tube is provided with cooperation tension cover, and U-bolt overlaps through the cooperation tension and fixes with nut.
The inner peripheral surface of the described first curve folder, the second curve folder, the 3rd curve folder, the 4th curve folder is a curve form, and has down zigzag structure in the vertical total length direction of inner surface.
Described conical tube, folder and pipe plug all are aluminum alloy materials.
The present invention adopts two protruding, groove structures of dovetail, and vertical each other, makes folder become 90 ° to the clamping force of lead, is bidirectional locking, its clamping force more evenly, bigger.
The periphery of four folders is a curve form; Make lead in certain weight range, occur bending and deformation, the mechanical performance of lead is changed, make lead multi-point bending distortion on both direction; Increase the frictional resistance that lead is extracted out, thereby reach the purpose of lead locking; Have down zigzag structure in the vertical total length direction of folder inner surface, make to be prone to into by lead difficulty goes out, increased the frictional force of lead locking state simultaneously.
Described conical tube, folder and pipe plug are aluminum alloy materials all, make that this strain clamp is in light weight, and have antirust function.
Description of drawings
Do further detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the front view of one group of folder.
Fig. 3 is the cutaway view of the A-A of Fig. 2.
Fig. 4 is the vertical view of another group folder.
Fig. 5 is the cutaway view of the B-B of Fig. 4.
Fig. 6 is the partial enlarged drawing of Fig. 5.
Fig. 7 clamps the front view of contiguous block for part.
Fig. 8 clamps the mansion view of contiguous block for part.
Fig. 9 clamps the left view of contiguous block for part.
Embodiment
As shown in Figure 1; A kind of quick double-brake self-locking type strain clamp; Comprise conical tube 1, reaction spring 5, folder and U-bolt 8, described folder is divided into left and right two groups of four parts, the first curve folder 11, the second curve folder 12, the 3rd curve folder 21, the 4th curve folder 22; Like Fig. 2, shown in 3; Become conical tube after the first curve folder 11 and the second curve folder 12 merge, its excircle cooperates with the inwall of conical tube 1, is provided with the first dovetail boss 13 at the bottom of the vertebra after it merges; Like Fig. 4, shown in 5, after merging, the 3rd curve folder 21 and the 4th curve folder 22 become conical tube, and its excircle cooperates with the inwall of conical tube 1, and the vertebra top after it merges is provided with the second dovetail boss 23; Be provided with folder contiguous block 3 in the centre of two groups of folders; As shown in Figs. 7-9; The both ends of the surface of folder contiguous block 3 are provided with orthogonal first dovetail groove 31 and second dovetail groove 32; As shown in Figure 1, wherein the first dovetail boss 13 cooperates with first dovetail groove 31, and the second dovetail boss 23 cooperates with second dovetail groove 32; At the bottom of the vertebra of conical tube 1, also be provided with pipe plug 6, and fixing with marking closely screw 7, between pipe plug 6 and folder, be provided with reaction spring 5; Be provided with at the outer wall of conical tube 1 and cooperate tension cover 9, U-bolt 8 is through cooperating tension cover 9 and fixing with nut.
Shown in Fig. 2 to 6, the inner peripheral surface of the described first curve folder 11, the second curve folder 12, the 3rd curve folder 21, the 4th curve folder 22 is a curve form, and has down zigzag 10 structures in the vertical total length direction of inner surface.
Described conical tube 1, folder and pipe plug 6 all are aluminum alloy materials.
The operation principle of quick double-brake self-locking type strain clamp: lead one end is inserted in the conical tube with the external force of 3.5-4.5kgf, move in propulsive force effect lower clamping piece direction at the bottom of vertebra, the internal diameter of two groups of folders increases simultaneously; Reaction spring 5 compression in the pipe, this moment, lead got in the folder, and its lead is falling can only advance under the effect of zigzag 10; Be difficult for withdrawing from, when lead stretched into sufficient length, external force stopped; Reaction spring 5 discharges, and folder is rebounded, and folder internal diameter under the effect of conical tube 1 diminishes lead is clamped; More firm for what lead was clamped, can be with lead and U-bolt 8 pulling round about simultaneously, along with the continuous increase of pulling force; The radially grip force of folder then increases thereupon, promptly accomplishes the work of locking lead.