CN115479841A

CN115479841A - System and method for testing strength of power stay insulator

Info

Publication number: CN115479841A
Application number: CN202211256865.5A
Authority: CN
Inventors: 王纯; 朱建宁; 陈合来; 夏维宏
Original assignee: Xuancheng Power Supply Co of State Grid Anhui Electric Power Co Ltd
Current assignee: Xuancheng Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2022-12-16

Abstract

The invention discloses a system and a method for testing the strength of an electric stay insulator, and relates to the technical field of tension testing of the stay insulator. The invention discloses an electric stay insulator strength testing system, which comprises a mounting seat, wherein clamping mechanisms are symmetrically arranged on the left and right sides of the upper end surface of the mounting seat, a self-changing tensioning mechanism used for testing tensile strength of a stay insulator is arranged in the middle of the upper end surface of the mounting seat through a plate frame, the self-changing tensioning mechanism comprises a pressing plate, the upper part of the plate frame is connected with a sliding block in a sliding mode through a sliding rod in a bilateral symmetry mode, and a limiting component used for pulling the pressing plate to move upwards and limit the pressing plate is arranged on the upper part of the plate frame through a reciprocating electric telescopic rod.

Description

System and method for testing strength of power stay insulator

Technical Field

The invention relates to the technical field of tension test of a stay insulator, in particular to a system and a method for testing the strength of an electric stay insulator.

Background

The pull-line insulator is composed of hardware fittings, a pull rod and an umbrella group, wherein the pull rod is fixedly connected with the hardware fittings in a matching way through an internal wedged conical surface, the umbrella group is formed by arranging umbrella bodies with different diameters outside the glass fiber reinforced plastic pull rod between core rods, the umbrella bodies are made of silicon rubber and are combined with the pull rod into a whole, so that an important role can be played in an overhead transmission line, the insulator is installed on a pull line of a distribution line, the problem that the pull line is accidentally electrified can be effectively avoided, the insulation between the pull line and the ground is realized, the pull-line insulator is used as one of important equipment of the transmission line, the test on various performances of the transmission line is very important, and the tensile strength is an important parameter influencing the performances of the insulator.

Chinese utility model patent with application number CN201620664494.8 discloses a glass insulator iron core tensile test machine, the device tests the insulator tensile strength through the rotatory mode that rolls up the stay cord pulling insulator of motor, but the in-process of acting as go-between insulator is all inconsistent by the dynamics of pulling at every turn because the wire pole is blown by the wind in the open air when using, and the device's pulling dynamics is crescent, therefore the tensile strength of insulator can not accurately be tested out enough, the limitation is great, the test accuracy is lower, furthermore, before carrying out tensile test to the pulling insulator, most join in marriage the mode of unification pair arc clamp through the bolt and come to the both ends centre gripping of pull rod fixed, but the not hard up condition that drops appears in the test procedure easily in this kind of fixed mode, thereby influence the normal clear of test.

Disclosure of Invention

The technical problem to be solved is as follows: the strength testing system and the testing method for the electric power stay insulator provided by the invention can solve the problems pointed out in the background technology.

The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme that the system for testing the strength of the electric stay insulator comprises a mounting seat, clamping mechanisms are symmetrically mounted on the left and right sides of the upper end surface of the mounting seat, a self-changing tensioning mechanism for testing the tensile strength of the stay insulator is mounted in the middle of the upper end surface of the mounting seat through a plate frame, the self-changing tensioning mechanism comprises a pressing plate, the upper portion of the plate frame is slidably connected with a sliding block and two sliding blocks through sliding rods in a bilateral symmetry mode, the front portions of the sliding blocks are fixedly connected with a pressing plate, an extrusion rod is symmetrically hinged to the lower end surface of the pressing plate, an upper opening tensioning box is mounted on the upper portion of the clamping mechanism, the lower end of the extrusion rod is hinged to a punching and pulling block which is slidably connected inside the tensioning box, a transverse plate rear end surface is fixedly connected with a transverse plate, a pulling spring is fixedly connected to the lower end surface of the transverse plate, a rotating shaft is rotatably connected to the upper end surface of the mounting seat through a vertical plate, a poking rod is fixedly connected to the outer portion of the rotating shaft, one end of the poking rod is hinged to the lower end of the convex block and the pulling spring through a limiting component for driving the poking rod to intermittently rotate, the poking rod, and an intermittent driving telescopic rod for driving the pushing rod to move up the limiting component for reciprocating the limiting component for driving the pushing the pressing plate to move up and limiting component for the limiting of the plate to move up.

Further, clamping mechanism includes that arc splint, toper receive piece and toper extrusion piece, the mount pad up end has the dead lever through sliding groove sliding connection, the anterior fixedly connected with bidirectional spring pole of dead lever, the terminal surface passes through connecting plate longitudinal symmetry fixedly connected with arc splint before the bidirectional spring pole, the outside fixedly connected with toper of arc splint receives the piece, the mount pad up end has the opening C shaped plate forward through spout cooperation slide sliding connection, a lateral surface that two horizontal sections of C shaped plate are close to each other has the toper extrusion piece that is used for and toper compression piece matched with through fixed column fixed connection, and toper extrusion piece inside gauge wall and toper compression piece outside gauge wall are contradicted, terminal surface fixed connection under C shaped plate up end and the stretch-draw box.

Further, the unit of step up is installed to mount pad terminal surface bilateral symmetry, the unit of step up includes push rod, arc clamping piece and promotes the post, mount pad up end fixedly connected with branch, terminal surface longitudinal symmetry fixedly connected with horizontal pole before the branch, the horizontal pole front portion articulates through the jack-post has extrusion frame, and the one end that relative extrusion frame is close to each other from top to bottom all articulates through the lug has the arc clamping piece, a side end face fixedly connected with and the corresponding push rod of extrusion frame that the C shaped plate is close to arc clamping plate, and terminal surface fixedly connected with slides and sets up the promotion post inside the extrusion frame before the push rod.

Further, the intermittent driving subassembly includes ratchet, drive plate and one-way pinion rack, the outside fixedly connected with ratchet of pivot, the terminal surface passes through connecting rod fixedly connected with drive plate under the diaphragm, the drive plate right-hand member face articulates through lug cooperation torsional spring equidistance has a plurality of to be used for with ratchet complex one-way pinion rack, the spacing groove has been seted up to one-way pinion rack lower part, the elasticity limiting plate of drive plate right-hand member face fixedly connected with joint in the spacing inslot portion.

Further, spacing subassembly includes tongue plate, slope frame and extrusion post, reciprocal electric telescopic handle lower extreme fixedly connected with tongue plate, terminal surface fixedly connected with slope frame before the tongue plate, the grillage lower part is used for through montant fixedly connected with slope frame matched with extrusion post.

Further, the pivot exterior wall rear portion fixedly connected with positioning disk, a plurality of constant head tank has evenly been fixed in positioning disk circumference outer wall circumference, the mount pad up end has the joint at the inside locating plate of constant head tank through the flexible depression bar symmetry sliding connection of panel seat cooperation spring.

Furthermore, the arc-shaped inner wall of the conical extrusion block is embedded and connected with a plurality of balls in an equidistance manner in a rotating manner.

A method for testing the strength of an electric stay insulator is completed by matching an electric stay insulator strength testing system, and comprises the following steps: s1: firstly, the stay insulator is placed into a clamping mechanism, and the end part of the stay insulator is clamped and fixed by the clamping mechanism.

S2: and then the self-changing tensioning mechanism drives the clamping mechanism to rapidly move towards the direction away from each other, and the clamping mechanism drives the stay wire insulator to be rapidly tightened, so that the tensile strength of the stay wire insulator can be tested.

The pull-type tensile testing device has the beneficial effects that (1) the drive plate is driven to ascend when the tension pulling spring moves upwards to store force by utilizing the pressing plate to test at every time, then the drive plate drives the poking rod to rotate by a certain angle through the unidirectional toothed plate matched with the ratchet wheel, and then the pull spring can be stretched to different gear positions by all the time before the pressing plate ascends at every time, so that the single tension force can be dynamically and automatically adjusted when the tensile strength of the stay-line insulator is tested, the actual use scene is more fitted, the testing result is more accurate, and the testing accuracy is improved.

(2) Through the cooperation of toper extrusion piece and toper compression piece, drive toper extrusion piece extrusion toper compression piece when the in-process stretch-draw box sideslip to the stay wire insulator test, thereby make the arc splint tighten up, the reinforcing is to the centre gripping dynamics of drawing the stick, the stretch-draw box can be in the sideslip again through promoting the capital move extrusion frame rotatory make two adjacent arc clamping pieces be close to the motion each other from top to bottom, thereby further press from both sides the drawing stick tightly, the condition that not hard up leads to droing appears in the centre gripping equipment in the test process has been avoided, stability when having guaranteed the test.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged view of the structure of part a in fig. 1 according to the present invention.

Fig. 3 is a rear view of the overall structure of the present invention.

Fig. 4 is an enlarged view of the structure of part B in fig. 3 according to the present invention.

Fig. 5 is a schematic diagram of the overall structure of the present invention when applied to a work object.

FIG. 6 is a front view structural schematic diagram of the clamping mechanism of the present invention.

Fig. 7 is a rear view structure diagram of the clamping mechanism of the present invention.

FIG. 8 is a schematic view of the intermittent drive assembly of the present invention in its mated configuration.

Fig. 9 is an enlarged view of the structure of part C in fig. 8 according to the present invention.

In the figure: 1. a mounting seat; 2. a clamping mechanism; 21. an arc-shaped splint; 22. a conical compression block; 23. a conical extrusion block; 24. a bi-directional spring rod; 25. a C-shaped plate; 3. a plate frame; 4. a self-changing tensioning mechanism; 41. pressing a plate; 42. an extrusion stem; 43. stretching the box; 44. punching and pulling blocks; 45. pulling the spring; 46. a rotating shaft; 47. a poke rod; 48. an intermittent drive assembly; 481. a ratchet wheel; 482. a drive plate; 483. a one-way toothed plate; 484. a limiting groove; 485. an elastic limit plate; 49. a limiting component; 491. a tongue-clamping plate; 492. an inclined frame; 493. extruding the column; 410. a reciprocating electric telescopic rod; 5. a slide bar; 6. a tightening unit; 61. a push rod; 62. an arc-shaped clamping piece; 63. pushing the column; 64. extruding the frame; 7. positioning a plate; 8. positioning a groove; 9. a spring telescopic compression bar; 10. and (7) positioning the plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 3, the present invention provides a technical solution: the utility model provides an electric power insulator strength test system of acting as go-between, includes mount pad 1, and clamping mechanism 2 is installed to 1 up end bilateral symmetry of mount pad, and mount pad 1 up end middle part is installed through grillage 3 and is used for acting as go-between insulator test tensile strength's formula tensioning mechanism 4 from changing.

Referring to fig. 1, 3 and 6, in this embodiment, the clamping mechanism 2 includes an arc-shaped clamp plate 21, the upper end surface of the mounting base 1 is slidably connected with a fixing rod through a sliding slot, the front portion of the fixing rod is fixedly connected with a bidirectional spring rod 24, the front end surface of the bidirectional spring rod 24 is fixedly connected with the arc-shaped clamp plate 21 through a connecting plate in an up-down symmetrical manner, the self-changing tensioning mechanism 4 includes a press plate 41, the upper portion of the plate frame 3 is slidably connected with slide blocks through slide rods 5 in an bilateral symmetrical manner, the front portions of the two slide blocks are fixedly connected with the press plate 41 together, the lower end surface of the press plate 41 is symmetrically hinged with an extrusion rod 42, the upper portion of the clamping mechanism 2 is provided with a tensioning box 43 with an upper opening, the lower end of the extrusion rod 42 is hinged with an impact pull block 44 slidably connected inside the tensioning box 43, the rear end surface of the press plate 41 is fixedly connected with a transverse plate, the lower end surface of the transverse plate is fixedly connected with a pulling spring 45, the upper end surface of the mounting base 1 is rotatably connected with a rotating shaft 46 through a vertical plate, a poke rod 47 is fixedly connected outside the rotating shaft, and one end of the poke rod 47 far away from the rotating shaft 46 is hinged with a convex block and the lower end of the pulling spring 45, and the intermittent driving assembly 48 for driving the poke rod 47 to rotate intermittently.

Referring to fig. 2, 4, 8 and 9, the intermittent driving assembly 48 includes a ratchet 481, a driving plate 482 and an one-way toothed plate 483, a ratchet 481 is fixedly connected to the outside of the rotating shaft 46, a driving plate 482 is fixedly connected to the lower end face of the transverse plate through a connecting rod, a plurality of one-way toothed plates 483 for engaging with the ratchet 481 are equidistantly hinged to the right end face of the driving plate 482 through a protrusion and a torsion spring, a limiting groove 484 is formed in the lower portion of the one-way toothed plate 483, an elastic limiting plate 485 clamped in the limiting groove 484 is fixedly connected to the right end face of the driving plate 482, a positioning disc 7 is fixedly connected to the rear portion of the outer surface of the rotating shaft 46, a plurality of positioning grooves 8 are uniformly and circumferentially and fixedly formed in the outer circumferential wall of the positioning disc 7, a positioning plate 10 clamped in the positioning groove 8 is symmetrically and slidably connected to the upper end face of the mounting base 1 through a plate seat and a spring telescopic rod 9, a limiting assembly 49 for pulling the pressing plate 41 to move upwards and limit the positioning plate is installed on the upper portion of the plate frame 3 through the reciprocating electric telescopic rod 410, the limiting assembly 49 includes a tongue plate 491, an inclined frame 491, the inclined frame 492, an inclined frame 492 is fixedly connected to the lower end face of the reciprocating electric telescopic rod 410, a pressing rod 492 is fixedly connected to the lower portion of the reciprocating electric telescopic rod 410, a pressing rod 492 is connected to the inclined frame 493 is connected to the lower portion of the reciprocating electric rod 493.

Before the tensile strength test of the stay insulator, the stay insulator is firstly placed in a clamping mechanism 2 for clamping and limiting, the end part of the stay insulator is placed in an upper arc-shaped clamping plate 21 and a lower arc-shaped clamping plate 21 which are adjacent to each other, the bidirectional spring rod 24 pulls the arc-shaped clamping plate 21 to clamp the stay insulator, then the self-changing tensioning mechanism 4 is started to operate, when the spring 45 is pulled to be in a natural state, the pressing plate 41 is positioned on the lower section of the sliding rod 5, the reciprocating electric telescopic rod 410 drives the tongue clamping plate 491 to reciprocate up and down, when the reciprocating electric telescopic rod 410 extends to the longest state, the tongue clamping plate 491 is positioned at the lowest position, at the moment, the bayonet of the tongue clamping plate 491 is clamped under the pressing plate 41, then the reciprocating electric telescopic rod 410 contracts to drive the tongue clamping plate 491 to ascend, the tongue clamping plate 491 is then driven to drive the pressing plate 41 to ascend, the pressing plate 41 drives the pulling spring 45 to be stretched, the pressing plate 41 then drives the punch-pull block 44 to move towards the middle of the mounting base 1 through the extrusion rod 42, the pressing plate 41 rises and simultaneously drives the driving plate 482 to rise through the transverse plate, when the driving plate 482 rises and passes through the ratchet 481, the one-way toothed plate 483 on the side of the driving plate 482 can be clamped with the ratchet 481, and the ratchet 481 drives the rotating shaft 46 to rotate, after the rotating shaft 46 rotates for a certain angle, the one-way toothed plate 483 is separated from the ratchet 481, the rotating shaft 46 rotates and simultaneously drives the poking rod 47 to rotate, the poking rod 47 drives the lower end of the extension spring to rotate, so that the extension spring is in different extension states each time when the pressing plate 41 rises, after the rotating shaft 46 rotates for a certain angle, the spring extension pressing rod 9 pushes the positioning plate 10 to be clamped into the positioning groove 8, and the rotating shaft 46 after rotation is subjected to limit and locking;

the clamp plate 491 drives the pressing plate 41 to rise to a certain height, then the extrusion column 493 slides into the inclined frame 492, the extrusion column 493 drives the clamp plate 491 to move forwards through the inclined frame 492 until the extrusion column is separated from the pressing plate 41, then the spring 45 is pulled to contract and reset to drive the pressing plate 41 to rapidly descend, the pressing plate 41 then presses the punching block 44 to move towards the direction away from the middle of the pressing plate 41 through the extrusion rod 42, the punching block 44 abuts against the inner wall of the tensioning box 43 to stop moving instantly when moving to the end part of the tensioning box 43, the pressing plate 41 continues to move downwards under the action of inertia of the pulling of the spring 45 and the downward movement, the pressing plate 41 pushes the clamping mechanism 2 to move towards the direction away from each other through the extrusion rod 42 and the tensioning box 43, so that the stay wire insulator in a clamped state is tensioned instantly tightened, thereby simulating a tensioned scene in the working process of the stay insulator, the drive rod 47 is driven to rotate by a certain angle through the cooperation of the drive plate 482 and the one-way 483 ratchet wheel to rotate the poking rod 481, so that the spring 45 is in different tension states when the stay plate is pulled in each time of strength test, thereby the tensile adjustment can be automatically, and the dynamic toothed plate 481 can be improved, and the tensile adjustment accuracy of the tensile test can be performed.

Referring to fig. 6 and 7, in this embodiment, the clamping mechanism 2 further includes a tapered pressure receiving block 22 and a tapered extrusion block 23, the tapered pressure receiving block 22 is fixedly connected to the outside of the arc-shaped clamping plate 21, the upper end surface of the mounting base 1 is slidably connected to a C-shaped plate 25 with a forward opening through a sliding slot and a sliding plate, one side end surface of two lateral sections of the C-shaped plate 25, which are close to each other, is fixedly connected to the tapered extrusion block 23 through a fixing column, which is used for being matched with the tapered pressure receiving block 22, and an inner surface wall of the tapered extrusion block 23 is abutted to an outer surface wall of the tapered pressure receiving block 22, an arc-shaped inner wall of the tapered extrusion block 23 is embedded in an equidistant manner and rotatably connected to a plurality of balls, so that friction between the tapered extrusion block 23 and the tapered pressure receiving block 22 can be reduced, and the upper end surface of the C-shaped plate 25 is fixedly connected to the lower end surface of the tension box 43.

Referring to fig. 6, the clamping units 6 are symmetrically installed on the left and right of the end surface of the installation base 1, each clamping unit 6 comprises a push rod 61, an arc-shaped clamping piece 62 and a pushing column 63, a supporting rod is fixedly connected to the upper end surface of the installation base 1, a cross rod is fixedly connected to the front end surface of the supporting rod in a vertically symmetrical mode, the front portion of the cross rod is hinged to a squeezing frame 64 through a shaft column, the mutually-close ends of the vertically-opposite squeezing frames 64 are hinged to the arc-shaped clamping pieces 62 through lugs, the push rod 61 corresponding to the squeezing frame 64 is fixedly connected to the end surface of one side, close to the arc-shaped clamping plate 21, of the c-shaped plate 25, and the pushing column 63 is fixedly connected to the front end surface of the push rod 61 and slidably arranged inside the squeezing frame 64.

In the process of carrying out the tensile strength test, when the self-changing tensioning mechanism 4 runs to the step of rapidly tightening the stay insulator, the tensioning box 43 moves to drive the C-shaped plate 25 to move, the C-shaped plate 25 then drives the conical extrusion block 23 to move, the conical extrusion block 23 moves and extrudes through the inclined inner wall of the conical extrusion block and the inclined outer wall of the conical compression block 22 in the process of moving, so that two arc-shaped clamping plates 21 which are adjacent up and down are close to each other, the end part of the stay insulator is further clamped, the push rod 61 drives the push rod 61 to move simultaneously when moving, the push rod 61 pushes the extrusion frame 64 to rotate through the push column 63, the arc-shaped clamping plates 62 at the lower part of the extrusion frame 64 move in the rotating process, the two arc-shaped clamping plates 62 which are adjacent up and down move close to each other, so as to further clamp the end part of the stay insulator, the firmness of clamping the end part of the stay insulator is greatly enhanced, and the situation that the clamping part loosens and falls off in the test process is avoided.

In addition, the invention also provides a method for testing the strength of the electric power stay insulator, which comprises the following steps:

s1: firstly, the stay insulator is put into the clamping mechanism 2, and the two-way spring rod 24 in the clamping mechanism 2 drives the two arc-shaped clamping plates 21 which are adjacent up and down to approach each other so as to clamp and fix the end part of the stay insulator.

S2: then carry out the tensile strength test to the insulator of acting as go-between through starting the operation of the self-changing tensioning mechanism 4, the self-changing tensioning mechanism 4 drives two clamping mechanism 2 towards the direction quick travel who keeps away from each other, clamping mechanism 2 takes the insulator of acting as go-between to tighten rapidly, come the simulation to act as go-between the extension that the insulator meets in the outdoor work in-process, thereby can test the tensile strength of the insulator of acting as go-between, the in-process of test is from the self-changing tensioning mechanism 4 still can drive clamping mechanism 2 and step up unit 6 operation, make the two can be firmly clip the insulator of acting as go-between, the condition that the looseness that appears and drops in the test procedure has been avoided.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an electric power acts as go-between insulator strength test system, includes mount pad (1), its characterized in that: clamping mechanisms (2) are symmetrically arranged on the left and right sides of the upper end face of the mounting seat (1), and self-changing tensioning mechanisms (4) used for testing tensile strength of the stay insulator are arranged in the middle of the upper end face of the mounting seat (1) through a plate frame (3);

from change formula straining device (4) including clamp plate (41), slide bar (5) bilateral symmetry sliding connection has the slider, two on grillage (3) upper portion slide bar (5) bilateral symmetry sliding connection has the slider, the anterior common fixedly connected with clamp plate (41) of slider, terminal surface symmetry articulates there is stripper bar (42) under clamp plate (41), upper portion open-ended stretch-draw box (43) is installed on clamping mechanism (2) upper portion, stripper bar (42) lower extreme and sliding connection are articulated each other at inside impact-draw piece (44) of stretch-draw box (43), clamp plate (41) rear end face fixedly connected with diaphragm, terminal surface fixedly connected with pulling spring (45) under the diaphragm, mount pad (1) up end rotates through the riser and is connected with pivot (46), pivot (46) outside fixedly connected with poker rod (47), and poker rod (47) keep away from the one end of pivot (46) and pass through lug and pulling spring (45) lower extreme and articulate each other, the terminal surface is provided with intermittent drive subassembly (48) that are used for driving poker rod (47) intermittent type rotation under diaphragm (3) upper portion installs through electric telescopic link (410) and move up its spacing subassembly (49).

2. The system of claim 1, wherein the system further comprises: clamping mechanism (2) include arc splint (21), toper and receive piece (22) and toper extrusion piece (23), mount pad (1) up end has the dead lever through sliding groove sliding connection, the anterior fixedly connected with two-way spring pole (24) of dead lever, the terminal surface passes through connecting plate longitudinal symmetry fixedly connected with arc splint (21) before two-way spring pole (24), arc splint (21) outside fixedly connected with toper receives piece (22), mount pad (1) up end has C shaped plate (25) that the opening is forward through spout cooperation slide sliding connection, a lateral surface that two horizontal sections of C shaped plate (25) are close to each other has the toper that is used for and toper to receive piece (22) matched with toper extrusion piece (23) through fixed column fixed connection, and toper extrusion piece (23) interior table wall and toper receive piece (22) exterior table wall to contradict, terminal surface fixed connection under C shaped plate (25) up end and stretch-draw box (43).

3. The system of claim 2, wherein the system further comprises: mount pad (1) terminal surface bilateral symmetry installs and steps up unit (6), step up unit (6) and include push rod (61), arc clamping piece (62) and promote post (63), mount pad (1) up end fixedly connected with branch, terminal surface longitudinal symmetry fixedly connected with horizontal pole before the branch, the horizontal pole front portion articulates through the jack-post has extrusion frame (64), and the one end that relative extrusion frame (64) is close to each other all articulates through the lug has arc clamping piece (62), a side end face fixedly connected with that C shaped plate (25) are close to arc clamping plate (21) and extrude frame (64) corresponding push rod (61), and terminal surface fixedly connected with slides before push rod (61) and sets up in inside promotion post (63) of extrusion frame (64).

4. The system of claim 1, wherein the system further comprises: intermittent type drive subassembly (48) include ratchet (481), drive plate (482) and one-way pinion rack (483), pivot (46) outside fixedly connected with ratchet (481), terminal surface passes through connecting rod fixedly connected with drive plate (482) under the diaphragm, drive plate (482) right-hand member face articulates through lug cooperation torsional spring equidistance has a plurality of to be used for with ratchet (481) complex one-way pinion rack (483), spacing groove (484) have been seted up to one-way pinion rack (483) lower part, drive plate (482) right-hand member face fixedly connected with joint is at inside elastic limiting plate (485) of spacing groove (484).

5. The system of claim 1, wherein the system further comprises: the limiting assembly (49) comprises a tongue clamping plate (491), a tilting frame (492) and an extruding column (493), the tongue clamping plate (491) is fixedly connected to the lower end of the reciprocating electric telescopic rod (410), the front end face of the tongue clamping plate (491) is fixedly connected with the tilting frame (492), and the lower portion of the plate frame (3) is fixedly connected with the extruding column (493) matched with the tilting frame (492) through a vertical rod.

6. The system of claim 1, wherein the system further comprises: pivot (46) exterior wall rear portion fixedly connected with positioning disk (7), a plurality of constant head tank (8) have evenly been seted up to positioning disk (7) circumference outer wall circumference is fixed, mount pad (1) up end has locating plate (10) of joint inside constant head tank (8) through flexible depression bar of panel seat cooperation spring (9) symmetry sliding connection.

7. The system of claim 2, wherein the system further comprises: the arc-shaped inner wall of the conical extrusion block (23) is embedded and connected with a plurality of balls in an equidistance manner in a rotating manner.

8. A method for testing the strength of a power line insulator, which is characterized in that the method is completed by the strength testing system of the power line insulator as claimed in claim 1, and comprises the following steps:

s1: firstly, putting a stay insulator into a clamping mechanism (2), and clamping the end part of the stay insulator by the clamping mechanism (2) for fixing;

s2: then, the self-changing tensioning mechanism (4) drives the clamping mechanism (2) to rapidly move towards the direction away from each other, and the clamping mechanism (2) drives the stay wire insulator to be rapidly tightened, so that the tensile strength of the stay wire insulator can be tested.