Wedge type strain clamp
The combination of a double-stage locking structure and a T-shaped block solves the problem of wedge core retreat and slippage in wedge-type tension clamps under long-term tension, achieving efficient and reliable conductor fixation.
Patent Information
- Application Number
- CN202510934431.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-10-17
AI Technical Summary
During the use of wedge-type tension clamps, the conductor undergoes plastic deformation under long-term tension, resulting in a decrease in the initial compression force of the wedge core, which may cause the wedge core to retreat beyond the safety threshold, causing the wedge core to accidentally loosen and slip, affecting the fixation of the conductor.
A two-stage locking structure is adopted, including mechanical one-way engagement between the locking structure and the ratchet plate and secondary locking of the positioning component to prevent the wedge core from retreating and slipping, and the installation accuracy of the wedge core is ensured by the cooperation of the T-block and the T-slot.
It effectively prevents the wedge core from retreating and slipping, improves construction efficiency, reduces the risk of wire pulling out, ensures the reliability of wire fixation, and reduces the problem of insufficient grip caused by installation errors.
Smart Images
Figure CN120810481A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of wedge type line clamp, in particular to a wedge type strain clamp. BACKGROUND
[0002] The strain clamp is an essential suspension and support fitting in the construction of power grid, which connects the two ends of the terminal or strain section of overhead line and insulator string together, and fixes and tightens the overhead insulated conductor. There are various types of strain clamp, and the wedge type insulating strain clamp is mostly used in the current rural power grid engineering. The shell of this type of clamp is made of anti-oxidation and high-strength aluminum alloy casting, which has no magnetic hysteresis loss. The wedge core is made of high-strength engineering plastic, which has good insulating performance. The key point is that the overhead insulated conductor does not need to be stripped of the insulating layer during the construction process, and the installation is simple and reliable, which greatly improves the construction efficiency. However, in recent years, due to the material of the wedge type insulating strain clamp and the insulating layer of the overhead insulated conductor or improper installation, the overhead insulated conductor often falls off from the wedge core of the strain clamp, which threatens the safe and reliable power supply of the power grid, especially the personal safety, and becomes a major safety hazard in rural power grid engineering.
[0003] During the use of the wedge type strain clamp, the plastic deformation (creep) of the conductor under long-term tension leads to the decrease of the initial compression force of the wedge core, which causes the decay of the holding force. The traditional wedge core may retreat beyond the safety threshold under extreme working conditions (such as icing vibration), which may cause accidental loosening of the wedge core, and the wedge core may not be installed in place, which may all cause the problem of slippage, thereby affecting the fixation of the conductor. SUMMARY
[0004] The present application aims at solving the problem of the fixation of the wedge type strain clamp, i.e. the plastic deformation of the conductor under long-term tension leads to the decrease of the initial compression force of the wedge core, which causes the decay of the holding force, and the traditional wedge core may retreat beyond the safety threshold under extreme working conditions, which may cause accidental loosening of the wedge core, and the wedge core may not be installed in place, which may all cause the problem of slippage, thereby affecting the fixation of the conductor, and proposes a wedge type strain clamp.
[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technology, a wedge type strain clamp: The wedge type strain clamp comprises a wedge type clamp body and a pull plate rotatably installed on both sides of the wedge type clamp body. Locking structures are fixed on both sides of the wedge type clamp body. Two symmetrical wedge cores are slidably installed in the inner cavity of the wedge type clamp body. Installation grooves are formed on one side of each of the two wedge cores. A clamping block is fixed on one side of each of the two clamping assemblies. A ratchet plate matched with the locking structure on the same side is embedded on the side of each of the two wedge cores away from each other. The ratchet plate can be clamped by the locking structure, thereby forming a first locking of the wedge core. The clamping block is moved by the clamping assembly, so that the clamping block slides against the wedge core to the side of the wedge-type clamp body, thereby forming a second locking.
[0006] The locking structure and the ratchet plate form a mechanical one-way engagement, which instantly locks the position of the wedge core, prevents accidental back-off due to hammering and vibration during installation, and prevents the wedge core from slipping due to wire creep during long-term operation. The double-stage independent locking mechanism completely eliminates the risk of wire extraction, and the safety is significantly higher than that of the single-stage locking structure.
[0007] When the wedge core is pushed, the teeth of the ratchet plate and the locking structure are automatically engaged (only one-way movement is allowed), which realizes installation and locking without additional operation. The cumbersome process of manually fixing the wedge core during installation of the traditional clamp is avoided, and the construction efficiency is improved by more than 30%.
[0008] The clamping block is linked to the installation depth of the wedge core. When under-installed, the clamping block cannot form effective clamping due to incomplete ejection. When over-installed, the wedge core displacement is out of limit, and the clamping block cannot be ejected due to the blocking of the body structure. The installation is determined by the two-stage locking state, which eliminates the problem of insufficient grip caused by installation error.
[0009] The technical solution realizes the combination of three functions of “installation anti-backoff + long-term anti-slip + installation accuracy self-checking” by pure mechanical structure, and solves the core hidden danger of wire extraction.
[0010] Further description of the wedge-type strain clamp according to the above technology: Two symmetrical T-shaped blocks are fixed to the top wall of the inner cavity of the wedge-type clamp body, and a T-shaped groove matched with the T-shaped blocks is formed on one side of each wedge core.
[0011] Further description of the wedge-type strain clamp according to the above technology: A double-curvature wire clamping groove is formed at the end of the two wedge cores close to each other, and a group of variable-diameter spiral strips are arranged in the inner cavity of the wire clamping groove.
[0012] Further description of the wedge-type strain clamp according to the above technology: The clamping assembly includes a plurality of connecting springs fixed to the side wall of the installation groove inner cavity, a plurality of connecting springs are fixed on one side of the cross plate sliding in the inner cavity of the clamping assembly, a demonstration block is fixed on one side of the cross plate, the other side of the cross plate is fixedly connected with the clamping block, and the clamping block is tightly attached to the wedge core.
[0013] Further description of the wedge-type strain clamp according to the above technology: Two side walls of the inner cavity of the wedge-type clamp body are provided with a demonstration groove matched with the demonstration block.
[0014] As a further description of the above-mentioned technology of a wedge strain clamp: The locking structure includes a mounting shell fixedly connected with the wedge clamp body, one side of the mounting shell is provided with a rotating handle, one side of the rotating handle is rotatably connected with a U-shaped plate sliding in the inner cavity of the mounting shell, and the inner cavity of the U-shaped plate is rotatably connected with a plurality of teeth matched with the ratchet plate through a torsional spring.
[0015] As described above, due to the adoption of the above-mentioned technology of a wedge strain clamp, the beneficial effects of the present application are: 1. The mutual cooperation between the locking structure and the ratchet plate forms a mechanical one-way locking, prevents accidental back-off during installation, can lock the wedge core position in time, forms a primary locking, through the mutual cooperation between the clamping assembly, the clamping block and the indicating groove, a secondary locking is formed, and through the mutual cooperation between the indicating groove and the indicating block, the under-assembly or over-assembly of the wedge core can be prevented; the secondary locking mechanism can avoid the grip decay caused by the creep of the wire and the slip problem caused by the improper installation of the wedge core, avoids the back-off of the wedge core, thereby reducing the influence on the wire fixation, and the double-stage locking completely eliminates the risk of wire pull-out.
[0016] 2. The mutual cooperation between the T-shaped block and the T-shaped groove can not only prevent the under-assembly or over-assembly of the wedge core, but also keep the moving direction of the wedge core consistent, thereby avoiding the problem of damage to the wire caused by the disordered moving direction of the wedge core due to hammering.
[0017] 3. The wire clamping groove and the variable-diameter spiral strip can significantly reduce the bending stress concentration, decompose the concentrated stress into multiple gradients, avoid causing aluminum strand fatigue breakage, and when the wire and the variable-diameter spiral strip contact each other, a variable-diameter spiral air duct is formed between the wire clamping groove, the variable-diameter spiral strip and the wire, which can guide the airflow to form a micro-eddy current, reduce the amplitude of the wire, and dynamically suppress wind vibration. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 Overall structure of the present application Figure 1 .
[0019] Figure 2 Overall structure of the present application Figure 2 .
[0020] Figure 3 The wedge clamp body structure of the present application.
[0021] Figure 4 The structure of the wedge core of the present application Figure 1 .
[0022] Figure 5 The structure of the wedge core of the present applicationFigure 2 .
[0023] Figure 6 Sectional view of the wedge core of the present application.
[0024] Figure 7 Enlarged view of A in Figure 6 .
[0025] Figure 8 Schematic view of the variable-diameter spiral strip cooperating with the conductor of the present application.
[0026] Figure 9 Schematic view of the locking structure of the present application.
[0027] Figure 10 Sectional view of the locking structure of the present application.
[0028] Figure 11 Schematic view of the locking structure cooperating with the ratchet plate of the present application.
[0029] Figure 12 Schematic view of the wedge core installation of the present application.
[0030] Legend: 10, wedge-type line clamp body; 11, pull plate; 12, T-shaped block; 13, schematic groove; 20, locking structure; 21, installation shell; 22, rotating handle; 23, U-shaped plate; 24, tooth; 30, wedge core; 31, T-shaped groove; 32, wire clamping groove; 33, variable-diameter spiral strip; 34, clamping assembly; 341, connecting spring; 342, cross plate; 343, schematic block; 35, installation groove; 36, ratchet plate; 37, clamping block. DETAILED DESCRIPTION
[0031] The wedge-type strain clamp of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0032] EMBODIMENT As Figure 1 and Figure 2As shown, a wedge strain clamp, comprising a wedge clamp body 10 and a pull plate 11 rotatably mounted on both sides of the wedge clamp body 10, the wedge clamp body 10 is the prior art, and the surface has reinforcing ribs and pull rings, a plurality of reinforcing ribs can ensure a certain strength of the clamp, and the clamp will not be damaged when being hammered, and the pull ring is used for connecting other devices, and the wedge clamp body 10 is fixed with a locking structure 20 on both sides, the locking structure 20 is used for locking the internal structure, and two symmetrical wedge cores 30 are slidably installed in the wedge clamp body 10, and the two wedge cores 30 are matched with the size of the wedge clamp body 10.
[0033] Next, as shown in Figure 4 and Figure 5 , one side of the two wedge cores 30 is provided with a mounting groove 35, and the mounting groove 35 is located on the side close to the pull ring, and the two mounting grooves 35 are slidably installed with a clamping assembly 34 in the cavity, the clamping assembly 34 is affected by the elastic force, and can move in the mounting groove 35, one side of the two clamping assemblies 34 is fixed with a clamping block 37, the clamping block 37 is clamped between the wedge clamp body 10 and the wedge core 30 when the wedge core 30 is installed in place, and the clamping block 37 is clamped between the wedge clamp body 10 and the wedge core 30, which can prevent the wedge core 30 from retreating, and the two wedge cores 30 are embedded with a ratchet plate 36 matched with the same side locking structure 20, and the locking structure 20 can clamp the ratchet plate 36, and the wedge core 30 is prevented from retreating.
[0034] By setting the clamping block 37 under the driving of the clamping assembly 34 and the cooperation between the locking structure 20 and the ratchet plate 36, the wedge core 30 is subjected to double-stage locking, which can avoid the grip attenuation caused by the creep of the wire and the slip problem caused by the improper installation of the wedge core 30.
[0035] Next, as shown in Figure 3 and Figure 4 , as shown, the wedge clamp body 10 is fixed with two symmetrical T-shaped blocks 12 in the cavity, and the two wedge cores 30 are provided with a T-shaped groove 31 matched with the T-shaped block 12 on one side, when the T-shaped block 12 completely enters the T-shaped groove 31, the wedge core 30 is in the installed state, which can avoid the problem of insufficient initial grip and avoid slip, and by setting the T-shaped groove 31 and the T-shaped block 12, when the wedge core 30 is hammered, if the wedge core 30 has been installed in place, the horizontal part of the T-shaped groove 31 will not move the wedge core 30 under the action of the horizontal part of the T-shaped block 12, which can avoid overloading of the wedge core 30.
[0036] In addition, the T-shaped block 12 and the T-shaped groove 31 are matched with each other, which can keep the moving direction of the wedge core 30 consistent, avoid the problem that the moving direction of the wedge core 30 is disordered due to hammering, and thus damage the wire.
[0037] Next, as shown in Figure 4 and Figure 6As shown, the two wedge cores 30 are provided with a double curvature wire clamping groove 32 at their close end, and a variable diameter spiral strip 33 is arranged in the inner cavity of the wire clamping groove 32. The variable diameter spiral strip 33 is tapered from the middle to both sides, so that the inner side of the variable diameter spiral strip 33 always maintains the same inner diameter. One variable diameter spiral strip 33 can be divided into two halves, which are respectively arranged in the inner cavities of the wire clamping grooves 32 of the two wedge cores 30.
[0038] The two sides of the wire clamping groove 32 are smooth transition horn mouths (the inner wall curvature radius is greater than or equal to 20 times the wire diameter), which can significantly reduce the bending stress concentration, decompose the concentrated stress into multiple levels of gradient, and avoid causing aluminum strand fatigue breakage.
[0039] As shown in the drawings, Figure 7 , the variable diameter spiral strip 33 arranged in the inner cavity of the wire clamping groove 32 forms a variable diameter spiral air duct between the wire clamping groove 32, the variable diameter spiral strip 33 and the wire when they contact with each other, which can guide the airflow to form a micro eddy current, reduce the wire amplitude, and dynamically suppress wind vibration.
[0040] Among them, the oxidation layer on the surface of the wire is scraped off in vibration, the contact resistance is reduced, the self-cleaning function is realized, and local overheating is prevented, thereby delaying the oxidation of the wire.
[0041] Further, as shown in the drawings, Figure 7 , the clamping component 34 includes a plurality of connecting springs 341 fixed to the side wall of the inner cavity of the mounting groove 35. The mounting groove 35 is cross-shaped, and one side of the plurality of connecting springs 341 is fixed with a cross plate 342 sliding in the inner cavity of the clamping component 34. One side of the cross plate 342 is fixed with a demonstration block 343. The side wall of the inner cavity of the mounting groove 35 is provided with a groove for sliding of the demonstration block 343. The other side of the cross plate 342 is fixedly connected with a clamping block 37. The inclined surfaces of the clamping block 37 and the demonstration block 343 have the same angle as the inclined surface of the wedge core 30.
[0042] In the initial state, the clamping block 37 and the demonstration block 343 are pressed to make the clamping block 37 and the demonstration block 343 in the same straight line with the inclined surface of the wedge core 30, and then slide along the inner cavity of the wedge-shaped line clamp body 10. After that, when the T-shaped groove 31 and the T-shaped block 12 cooperate, the cross plate 342 moves with the clamping block 37 and the demonstration block 343 due to the action of the connecting spring 341, so that the clamping block 37 slides along the side of the wedge core 30. The side of the wedge core 30 clamps the clamping block 37, which can prevent the wedge core 30 from retracting and sliding, and the clamping block 37 is tightly attached to the wedge core 30.
[0043] Next, as shown in the drawings, Figure 3 , Figure 7 , and Figure 12As shown, the two side walls of the inner cavity of the wedge-shaped wire clamp body 10 are provided with a schematic groove 13, the schematic block 343 is matched with the same side schematic groove 13, and the inclined surface of the schematic block 343 is attached with a reflective strip. The reflective strip is a color development design, such as green, red, etc. When the T-shaped block 12 and the T-shaped groove 31 are installed in place, the schematic block 343 is located in the inner cavity of the schematic groove 13, that is, the schematic block 343 can be clamped to prevent the wedge core 30 from retreating, and the reflective strip on the schematic block 343 can be observed through the schematic groove 13, so that under-assembly or over-assembly can be avoided.
[0044] Further, as shown in the figure, Figures 9-11 The locking structure 20 includes a mounting shell 21 fixedly connected with the wedge-shaped wire clamp body 10. One side of the mounting shell 21 is provided with a rotating handle 22. The rotating handle 22 includes a rotating disc and a screw rod. The screw rod on the rotating handle 22 penetrates through the mounting shell 21 and is threadedly connected with the mounting shell 21. One side of the rotating handle 22 is rotatably connected with a U-shaped plate 23 sliding in the inner cavity of the mounting shell 21. The screw rod on the rotating handle 22 is rotatably connected with the mounting shell 21, so that when the rotating handle 22 is rotated, the U-shaped plate 23 can slide in the inner cavity of the mounting shell 21.
[0045] Next, as shown in the figure, Figure 11 The inner cavity of the U-shaped plate 23 is rotatably connected with a plurality of teeth 24 matched with the ratchet plate 36 through a torsion spring. The teeth 24 are in an initial state, that is, the ratchet on the ratchet plate 36 is in a clamped state, and can only be rotated towards the moving direction of the wedge core 30. Then, it still returns to the initial state.
[0046] Among them, the teeth 24 are matched with the teeth on the ratchet plate 36. During the process of hammering the wedge core 30 to move the wedge core 30, the teeth 24 will clamp the teeth on the ratchet plate 36 to prevent the wedge core 30 from retreating when being hammered. In addition, by clamping the ratchet plate 36 through the teeth 24, the wedge core 30 can also be prevented from retreating after installation, avoiding the problem of sliding. By rotating the rotating handle 22, the U-shaped plate 23 is moved, so that the teeth 24 and the ratchet plate 36 are separated, which is convenient for disassembling the wedge core 30.
[0047] It should be noted that the wedge-shaped wire clamp body 10, the connecting spring 341 and the ratchet plate 36 in the present application are all prior art, and their installation methods and control methods are also conventional designs, which will not be described in detail.
[0048] The working principle of the present application: the mutual cooperation between the locking structure 20 and the ratchet plate 36 can prevent the wedge core 30 from slipping and form a primary locking. The mutual cooperation between the clamping assembly 34, the clamping block 37 and the guide groove 13 can prevent the wedge core 30 from being under- or over-installed while forming a secondary locking. The secondary locking mechanism can avoid the grip decay caused by the wire creep and the slipping problem caused by the improper installation of the wedge core 30, thereby reducing the impact on the wire fixation.
[0049] In use, the wire is clamped by the wire clamping groove 32 between the two wedge cores 30, and then the clamping blocks 37 on the two wedge cores 30 are pressed to make the inclined surfaces of the clamping blocks 37 consistent with the inclined surfaces of the wedge cores 30. Then, the T-shaped slot 31 is aligned with the vertical part of the T-shaped block 12 for installation. Next, the two wedge cores 30 are hammered to move along the inner cavity of the wedge-shaped wire clamp body 10.
[0050] During hammering, the variable pitch helical strip 33 in the inner cavity of the wire clamping groove 32 can slightly twist the wire, and the slight twist is converted into an increase in clamping force.
[0051] Then, the wedge core 30 gradually moves until the side of the horizontal part of the T-shaped block 12 is tightly attached to the side of the inner cavity of the horizontal part of the T-shaped slot 31. Under the action of the connecting spring 341, the cross plate 342 moves with the guide block 343 and the clamping block 37. At this time, the guide block 343 is located in the inner cavity of the guide groove 13, which can prevent the wedge core 30 from being under- or over-installed, and can also prevent the wedge core 30 from retreating or slipping. The clamping block 37 is tightly attached to one side of the wedge-shaped wire clamp body 10, so that the clamping block 37 clamps the wedge core 30, and the wedge core 30 cannot retreat or slip, which is a primary locking.
[0052] The cooperation between the T-shaped block 12 and the T-shaped slot 31 and the cooperation between the guide block 343 and the guide groove 13 can ensure that the wedge core 30 is installed in place and prevent the wedge core 30 from being under- or over-installed, thereby avoiding the problem of wedge core 30 slipping due to improper installation.
[0053] During the movement of the wedge core 30, the ratchet plate 36 pushes the plurality of teeth 24 to move, so that the wedge core 30 can move along the inner cavity of the wedge-shaped wire clamp body 10. However, the teeth 24 can clamp the ratchet plate 36, so that the ratchet plate 36 cannot retreat, which can reduce the risk of the wedge core 30 falling during installation. After installation is completed, the teeth 24 can clamp the ratchet plate 36, so that the wedge core 30 cannot retreat, thereby achieving the purpose of secondary locking.
[0054] Then, when disassembling, it is only necessary to rotate the handle 22 to move the U-shaped plate 23, thereby separating the U-shaped plate 23 with the mounting teeth 24 and the ratchet plate 36, and then squeeze the two blocks 37 toward the side close to each other to disable the secondary locking mechanism, thereby removing the two wedge cores 30 from the inner cavity of the wedge-shaped wire clamp body 10. The two wedge cores 30 can be removed without the aid of additional tools, which reduces the difficulty of operating the device and improves the applicability of the device.
[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who can make equivalent replacements or changes to a wedge-type tension clamp and its inventive concept according to the technology of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A wedge-shaped tension clamp, comprising a wedge-shaped clamp body (10) and pull plates (11) rotatably mounted on both sides of the wedge-shaped clamp body (10), characterized in that: The wedge-shaped wire clamp body (10) is fixed with a locking structure (20) on both sides, and two symmetrical wedge cores (30) are slidably installed in the inner cavity of the wedge-shaped wire clamp body (10), and a mounting groove (35) is provided on one side of the two wedge cores (30), and a positioning assembly (34) is slidably installed in the inner cavity of the two mounting grooves (35), and a clamping block (37) is fixed on one side of the two positioning assemblies (34), and a ratchet plate (36) adapted to the locking structure (20) on the same side is inlaid on the side of the two wedge cores (30) away from each other; The ratchet plate (36) can be locked by the locking structure (20), thereby forming a primary lock on the wedge core (30), and the clamping block (37) is pushed to move by the clamping assembly (34), so that the clamping block (37) slides toward one side of the wedge-shaped wire clamp body (10) along the wedge core (30), thereby forming a secondary lock.
2. A wedge-shaped tension clamp according to claim 1, characterized in that: Two symmetrical T-shaped blocks (12) are fixed to the top wall of the inner cavity of the wedge-shaped wire clamp body (10), and one side of each of the two wedge cores (30) is provided with a T-shaped slot (31) adapted to the T-shaped blocks (12).
3. A wedge-shaped tension clamp according to claim 1, characterized in that: The ends of the two wedge cores (30) that are close to each other are provided with a double-curvature wire clamping groove (32), and the inner cavity of the wire clamping groove (32) is provided with a group of diameter-changing spiral strips (33).
4. A wedge-shaped tension clamp according to claim 1, characterized in that: The locking assembly (34) includes a plurality of connecting springs (341) fixed to the inner cavity side wall of the mounting groove (35), a cross plate (342) sliding in the inner cavity of the locking assembly (34) is fixed on one side of the connecting springs (341), a schematic block (343) is fixed on one side of the cross plate (342), and the other side of the cross plate (342) is fixedly connected to the locking block (37), and the locking block (37) is in close contact with the wedge core (30).
5. A wedge-type tension clamp according to claim 4, characterized in that: Both side walls of the inner cavity of the wedge-shaped wire clamp body (10) are provided with schematic grooves (13), and the schematic block (343) is adapted to the schematic grooves (13).
6. A wedge-type tension clamp according to claim 1, characterized in that: The locking structure (20) comprises a mounting shell (21) fixedly connected to the wedge-shaped wire clamp body (10), a rotating handle (22) being provided on one side of the mounting shell (21), a U-shaped plate (23) sliding in the inner cavity of the mounting shell (21) being rotatably connected on one side of the rotating handle (22), and a plurality of teeth (24) adapted to the ratchet plate (36) being rotatably connected to the inner cavity of the U-shaped plate (23) via a torsion spring.