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CN-122000708-A - Double-bolt pressure self-balancing parallel groove clamp

CN122000708ACN 122000708 ACN122000708 ACN 122000708ACN-122000708-A

Abstract

The invention belongs to the technical field of electric power fittings, and provides a double-bolt pressure self-balancing parallel groove clamp which comprises a U-shaped clamping block, two sets of bolt fastening assemblies, four movable clamping blocks and two limiting blocks, wherein the movable clamping blocks are axially symmetrically arranged in an inner cavity of the U-shaped clamping block in a sliding mode, a first groove is formed in the inner side wall of the U-shaped clamping block, and a second groove which is oppositely arranged with the first groove is formed in the outer side wall of each movable clamping block. According to the invention, the movable clamping blocks can realize stepless position adjustment along the extending direction of the sliding grooves, and the different-diameter oval wire accommodating grooves with different radial dimension ratios can be flexibly formed by adjusting the relative distance between the movable clamping blocks and the clamping parts of the U-shaped clamping blocks, so that the cable splicing requirements of different nominal sections and different wire diameter specifications are adapted, the scene suitability and the site construction convenience of the cable clamp are greatly improved, and the operation requirements of the diversity of distribution network engineering are met.

Inventors

  • ZHU MINGMEI

Assignees

  • 江苏金逸电力科技有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (9)

  1. 1. The double-bolt pressure self-balancing parallel groove clamp comprises a U-shaped clamping block (1) and two sets of bolt (16) fastening components, and is characterized by further comprising four movable clamping blocks (2) and two limiting blocks (3); The movable clamping blocks (2) are arranged in the inner cavity of the U-shaped clamping block (1) in an axisymmetric sliding mode, a first groove (6) is formed in the inner side wall of the U-shaped clamping block (1), a second groove (7) which is arranged opposite to the first groove (6) is formed in the outer side wall of each movable clamping block (2), and the first groove (6) and the second groove (7) which are arranged opposite to each other are surrounded to form a wire accommodating groove; The two limiting blocks (3) are respectively and correspondingly arranged between two movable clamping blocks (2) of the two groups of clamping assemblies, the side walls of the limiting blocks (3) facing the movable clamping blocks (2) at the two sides are respectively provided with a first inclined surface (4), and the side walls of the movable clamping blocks (2) facing the corresponding limiting blocks (3) are provided with a second inclined surface (5) which is matched and attached with the first inclined surface (4); the inner walls of the first groove (6) and the second groove (7) are respectively provided with a thermal compensation pressure equalization gasket (8), and the thermal compensation pressure equalization gaskets (8) are made of manganese-copper-based anti-corrosion tile negative thermal expansion alloy.
  2. 2. The double-bolt pressure self-balancing parallel groove clamp according to claim 1, wherein the U-shaped clamp blocks (1) are provided with sliding grooves (9) corresponding to the positions of the movable clamp blocks (2) of each group of clamping assemblies, and sliding blocks (10) in sliding fit with the sliding grooves (9) are integrally formed at the bottoms of the movable clamp blocks (2).
  3. 3. The double-bolt pressure self-balancing parallel groove clamp according to claim 2, wherein each set of bolt (16) fastening assembly comprises a bolt (16), a second base plate (15), an elastic gasket and a nut, an axially-through bolt (16) mounting hole is formed in the middle of the limiting block (3), and the bolt (16) sequentially penetrates through the second base plate (15), the sliding groove (9) and the bolt (16) mounting hole from bottom to top, and is sleeved with the elastic gasket and connected with the nut in a threaded mode.
  4. 4. The double-bolt pressure self-balancing parallel groove clamp according to claim 2, wherein the lower surface of the sliding block (10) protrudes out of the lower surface of the U-shaped clamp block (1), the lower end surface of the sliding block (10) is fixedly connected with a first base plate (11) through a fastening screw (12), and the radial outline size of the first base plate (11) is larger than the groove width of the sliding groove (9).
  5. 5. The double-bolt pressure self-balancing parallel groove clamp according to claim 4, wherein the first base plate (11) is integrally formed with symmetrically arranged positioning blocks (13) towards one side surface of the movable clamp block (2), positioning grooves (14) matched with the positioning blocks (13) in shape are correspondingly formed in the lower end face of the movable clamp block (2), and the positioning blocks (13) are embedded in the positioning grooves (14).
  6. 6. The double-bolt pressure self-balancing parallel groove clamp according to claim 1 is characterized in that two first inclined planes (4) on two sides of the same limiting block (3) are symmetrically distributed, and inclined plane matching structures corresponding to two groups of clamping components are arranged in an axisymmetric mode by taking a longitudinal central axis of a U-shaped clamping block (1) as a symmetry axis.
  7. 7. The double-bolt pressure self-balancing parallel groove clamp according to claim 1, wherein the thermal compensation pressure balancing gasket (8) is fixedly attached to the inner walls of the first groove (6) and the second groove (7), and the working surface of the thermal compensation pressure balancing gasket is matched with the outline of the outer wall of a cable to be clamped.
  8. 8. The double-bolt pressure self-balancing parallel groove clamp according to claim 2, wherein the sliding block (10) can slide steplessly along the extending direction of the sliding groove (9) so as to adjust the radial dimension of the wire accommodating groove.
  9. 9. The double-bolt pressure self-balancing parallel groove clamp disclosed by claim 3 is characterized in that when a bolt (16) is screwed and fastened, the locking force of the nut drives the limiting block (3) to do longitudinal feeding motion along the axial direction of the bolt (16), the reversing transmission of force is realized through the inclined plane matching structure between the limiting block (3) and the movable clamping block (2), the longitudinal linear feeding motion of the limiting block (3) is converted into the horizontal and transverse pushing motion of the movable clamping block (2) along the sliding groove (9), and meanwhile, the clamping force of the movable clamping blocks (2) at two sides is automatically balanced and distributed through the synchronous linkage of two groups of inclined plane matching structures which are symmetrically distributed.

Description

Double-bolt pressure self-balancing parallel groove clamp Technical Field The invention relates to the technical field of electric power fittings, in particular to a parallel groove clamp, which is self-balanced by double bolt pressure. Background With the continuous promotion of the construction of the distribution network in China and the continuous deepening of the upgrading and transformation of urban and rural power grids, the coverage ranges of overhead distribution lines and low-voltage cable lines are continuously enlarged, and the safety, reliability and operation and maintenance convenience of line operation become core assessment indexes of the power grid construction. The parallel groove clamp is used as a splicing fitting with the largest consumption and the most extensive application in a distribution network system, and has the core function of realizing uninterrupted splicing, splitting and branch T-connection of two parallel wires on the premise of not cutting off a main wire, and the structural performance, the clamping reliability and the environmental suitability of the parallel groove clamp directly determine the current carrying stability and the operation safety of a circuit. At present, the most widely used parallel groove clamp with a double-bolt structure in the industry, the core structure of the parallel groove clamp generally comprises an upper clamping plate and a lower clamping plate which are correspondingly arranged, semicircular grooves for accommodating wires are formed in the corresponding positions of the upper clamping plate and the lower clamping plate, the two ends of the upper clamping plate and the lower clamping plate are respectively matched with a locking nut through a fastening bolt to realize rigid locking, and the upper clamping plate and the lower clamping plate are driven to be folded through bolt pretightening force to clamp and fix the wires and conduct electricity. Compared with a single-bolt parallel groove clamp, the double-bolt structure has longer clamping length, larger wire contact area and higher rated holding power, is a main stream product for connecting wires in a middle-low voltage distribution line of 10kV and below, and has been incorporated into industries and national mandatory standards such as DL/T765.1-2018, GB2314-2008, electric power fitting general technical condition, and the like. However, in long-term engineering application and line operation and maintenance practice, the existing double-bolt parallel groove clamp has extremely poor reducing connection adapting capability, and cannot reliably realize the cross-specification connection operation of thin cables and thick cables, and cannot meet the core engineering requirements of branch T connection of a distribution network line. The upper clamping plate and the lower clamping plate of the conventional double-bolt parallel groove clamp are correspondingly provided with wire accommodating grooves, and symmetrical equal-diameter semicircular structural designs (such as patent document CN 121011862A) are adopted, namely, the groove radiuses of the upper clamping plate and the lower clamping plate are completely consistent, and the specifications of two groups of clamping grooves correspondingly arranged by double bolts are unified, so that the connection of two equal-diameter/near-equal-diameter wires with the same nominal section or with the wire diameter difference not exceeding 1 specification level can be realized. In the middle-low voltage distribution network engineering of 10kV and below, the most core and common construction scene is a line branch T joint, namely a main line adopts a large-section thick cable of 120mm 2、240mm2 and the like, a household branch and an equipment power taking branch adopt a small-section thin cable of 16mm 2、25mm2、35mm2 and the like, and the thin cable is directly connected to the thick cable to realize uninterrupted current distribution. Aiming at the different-diameter connection requirement with obvious thickness difference, the conventional constant-diameter parallel groove clamp cannot realize reliable clamping at all, if the specifications of the groove are matched with those of the thick cable, a large gap exists between the thin cable and the inner wall of the groove, effective surface contact compression cannot be formed, the clamping force is almost zero, wire drawing and slipping off are easy to occur, line disconnection faults are caused, if the specifications of the groove are matched with those of the thin cable, the thick cable cannot be embedded into the groove, only partial line contact can be formed between the thick cable and the edge of the groove, the thick cable core is crushed and broken by forced locking bolts, and meanwhile, serious deflection of a clamping plate is caused, so that the risks of clamping failure and poor contact are further increased. In the prior art, although parallel groove clamps (such as a patent docu