CN114156774B - Power transmission line overhead ground wire fitting replacement device - Google Patents
Power transmission line overhead ground wire fitting replacement device Download PDFInfo
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- CN114156774B CN114156774B CN202111409508.3A CN202111409508A CN114156774B CN 114156774 B CN114156774 B CN 114156774B CN 202111409508 A CN202111409508 A CN 202111409508A CN 114156774 B CN114156774 B CN 114156774B
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- overhead ground
- shear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
Abstract
The utility model provides a transmission line overhead ground wire gold utensil change ware, relate to electric power transmission line instrument technical field, the body bottom is provided with the fixed axle, the fixed axle inserts in the draw-in groove that the card was sat the top and is fixed through bolt A, the tip that the card was sat still is provided with bolt B, bolt B bottom plate and card are sat and are connected as an organic wholely, the card is sat the bottom and is provided with tower material draw-in groove, tower material draw-in groove card is on the tower material and is fixed through the adjusting bolt who sets up on the bottom plate, one side of body still is provided with the ear, be provided with the bayonet socket on the ear, be provided with the anti-twist lead screw in the bayonet socket, the upper end of anti-twist lead screw is connected with the rocking arm, the bottom of anti-twist lead screw is connected with the lifting hook through the anti-twist ware, lifting hook bottom couple department is provided with the anticreep cardboard. The invention has the beneficial effects that: the overhead ground wire suspension clamp to be overhauled is replaced by the tool, is not influenced by factors such as overhauling environment, tower type and cross arm length, can greatly improve the stability of overhead ground wire fixation in the operation process, and improves the safety of lines and operators.
Description
Technical Field
The invention relates to the technical field of electric power transmission line tools, in particular to a power transmission line overhead ground wire fitting changer.
Background
In recent years, with the continuous development of industrial production, urban construction and continuous expansion of power grid scale are carried out, and in the running process of 35kV and 110kV overhead lines in the jurisdiction area of enterprises, the overhead ground wire fitting is influenced by regional climate, line running years and human activities, and falls off due to stress abrasion, corrosion, nut loss and other reasons, if the defects are not eliminated in time, the overhead ground wire fitting can possibly fall to a lead, so that the line is tripped, and the safe and stable running of the line is seriously influenced.
Up to now, no professional tools or tools are available for carrying out the defect maintenance work, and in the past maintenance work, hidden danger overhead ground wire connecting fittings are replaced mainly through a triple travelling pulley, a single pulley or a wire tightener. However, the overhead ground wire and the cross arm hanging point of the power transmission line erected and operated by a company are usually connected and fixed by a U-shaped ring, an extension ring and a suspension clamp, the distance between the overhead ground wire and the cross arm hanging point is generally 10-20 cm, the length of a three-running pulley is 30cm, the length of a single pulley is 15cm, the length of a wire tightener is 20cm, and when the hanging point of the three-running pulley (single pulley or wire tightener) is selected to be near the hanging point of the overhead ground wire, the effective travel of the three-running pulley is seriously insufficient, and the replacement cannot be completed; when the hanging point of the three-pulley (single pulley or wire tightener) is selected to be far away from the hanging point of the overhead ground wire, the three-pulley meets the effective stroke, but in the replacement process, the three-pulley is possibly broken due to the friction of stress and shaking with the sharp part and the protruding part of the tower material, so that the overhead ground wire falls down and droops to the wire, the circuit trips, and great potential safety hazards exist.
Because of the great potential safety hazard in the replacement process of the overhead ground wire fitting, a power failure maintenance mode is often adopted to ensure the safety of operators and power grids. However, the power failure overhaul has the following defects:
the electric energy loss is increased, and the power supply of the regional power grid can be influenced when the power failure of the load overhead transmission line is overhauled. In the power transmission line and the distribution network, the power failure of a single or a plurality of power transmission lines can change the regional power transmission structure, and meanwhile, the optimal distribution form in the distribution network can also be changed, for example, the looped network type power supply is changed into the remote trunk type power supply, so that the line loss is greatly increased, and the load is reduced.
Sometimes the defects can not be eliminated in time, the hidden trouble line power failure maintenance in the line safety operation is usually periodic, and the power failure interval is longer, so that some defects which can not be eliminated in a charged state can not be eliminated in time, the line is possibly tripped, and the line has low stable operation reliability.
Influencing user power consumption
For a line without standby power supply, the voltage of the area is lost during the power failure maintenance period of the line; for a large load area or a large load time period, the power failure maintenance of the line can cause insufficient regional power supply, and meanwhile, the reliability of the power supply of the line can be reduced, so that the power consumption of a user is seriously influenced.
In order to solve the problems, a special tool is required to be developed to complete the replacement work of the overhead ground wire fittings of the power transmission line, the effective stroke of the tool can be greatly increased, in the use process, the overhead ground wire can be stably and firmly fixed, hidden danger of disconnection does not exist, the live replacement condition can be met, meanwhile, the tool can be installed and used in different tower shapes and different operation environments, in the operation process, the safety of operators and power grid equipment can be effectively guaranteed, the use of the tool can reduce the working difficulty, the operation time is saved, the number of operators is reduced, the physical consumption of the operators is reduced, and certain economic and social benefits can be created.
Disclosure of Invention
The invention provides a power transmission line overhead ground wire fitting changer, which is characterized in that: the body (1) bottom is provided with fixed axle (2), fixed axle (2) insert in draw-in groove (4) that clamping seat (6) top set up and through bolt A (3) fixed, the tip of clamping seat (6) still is provided with bolt B (5), bolt B (5) are connected bottom plate (8) and clamping seat (6) as an organic wholely, clamping seat (6) bottom is provided with tower material draw-in groove (7), tower material draw-in groove (7) card is on tower material (9) and is fixed through adjusting bolt (10) that set up on bottom plate (8), one side of body (1) still is provided with bayonet socket (15), be provided with in bayonet socket (15) anti-torsion lead screw (14), the upper end of anti-torsion lead screw (14) is connected with rocking arm (16), the bottom of anti-torsion lead screw (14) is connected with lifting hook (12) through anti-torsion device (13).
The fixed shaft (2) is horizontally provided with bolt holes in two directions, and the bolt holes in the two directions are intersected at 90 degrees.
The cross section of the lug part (17) is I-shaped.
The fixed shaft (2) is cylindrical or square in shape.
The fitting changer is made of 7A04 aluminum alloy.
The clamping seat (6) is arranged above the tower material (9) to be installed, the tower material (9) is firmly wrapped, the clamping seat is one of main components for installing and fixing the whole suspension clamp replacement device, bending shear force is mainly generated in the use process, the bearing performance of the clamping seat (6) is not less than 30KN and is higher than 500kN/cm < 2 >, the factors in all aspects are comprehensively considered, and the clamping seat (6) is formed by forging 7A04 aluminum alloy.
The bottom plate (8) is arranged below the tower material (9) to be installed, is an installation foundation of the whole suspension clamp replacement device, is mainly subjected to bending shear force in the use process, has the bearing performance not smaller than 30KN and mechanical strength larger than 500kN/cm < 2 >, and comprehensively considers factors in various aspects, and the bottom plate (8) is forged by 7A04 aluminum alloy.
The anti-torsion screw (14) is used for lifting and fixing the overhead ground wire, is mainly subjected to the gravity of the overhead ground wire and the oblique pulling force on two sides in the use process, and is used for ensuring the stability of bearing force in the use process, the lifting hook (12) is not separated, the bearing force performance is not less than 30KN, the mechanical strength is more than 500kN/cm < 2 >, and the screw is forged by 7A04 aluminum alloy by comprehensively considering various factors.
The lifting hook (12) is directly connected with the anti-torsion screw rod (14) and is used for hanging the overhead ground wire and realizing the functions of lifting, dropping and fixing the overhead ground wire, and the lifting hook is mainly subjected to the gravity of the overhead ground wire and the oblique pulling force on two sides in the use process, so that the tool is firmly installed and normally used, the bearing performance is not less than 30KN, and the mechanical strength is more than 500kN/cm < 2 >. Taking all factors into consideration comprehensively, the lifting hook is forged by 7A04 aluminum alloy.
The bolt is used for connecting the clamping seat, the bottom plate and other main components, and the adjusting screw is connected with the lifting hook and is a direct bearing part. In order to ensure that the whole tool is firmly installed and normally used, the bearing performance of the tool is not less than 30KN. Considering all factors comprehensively, the screw M16 is manufactured by 40Cr, the adjusting screw is cast by 7A04 aluminum alloy of the screw M16, and the nut is selected according to national standards.
Application method
The tool for replacing the overhead ground wire fitting, which is required to be prepared by using the invention, comprises: the device, the insulation transmission rope, the rope sleeve, the insulation pulley, the personal tool and the safety tool (safety belt, back protection rope, personal security wire and the like) are provided. After the preparation of the tool is completed, the insulating rope passes through the pulley and two ends of the insulating rope are bound together, the insulating rope is fixed on the tower through the rope sleeve and the pulley, one end of the insulating rope is a traction rope (a pull rope), and the other end of the insulating rope is a control rope (a tail rope).
Safety tool, insulating rope, pulley and rope sleeve inspection:
the appearance inspection is carried out on the insulating ropes, the pulleys and the rope loops, whether test cards exist or not, whether test dates are expired or not, whether the insulating ropes are broken or not and whether the pulleys are cracked or not are inspected, and tools such as the insulating ropes, the pulleys and the rope loops which are unqualified in inspection are replaced in time.
Whether the safety belt and the back protection rope are provided with test cards or not is checked, whether the safety belt buckle and the connecting part are connected well or not is checked, and unqualified replacement is performed in time.
After ensuring that the safety tools, the protection ropes, the pulleys, the rope loops and the like are checked to be qualified, the operator climbing the tower. After climbing to a proper position of the tower head, the rope sleeve and the pulley are hung according to the working requirement. The ground operator binds the overhead ground wire fitting changer and other tools and instruments, and transfers things to the operator position by operating the traction rope and the control rope. And the operator installs and fixes the overhead ground wire fitting changer and completes fitting replacement work. The specific operation flow is as follows:
a. the ground operator passes the insulating rope through the insulating pulley, binds two ends of the insulating rope, and makes one end of the insulating rope a transmission rope (pull rope) and one end of the insulating rope a control rope (tail rope);
b. the tower climbing operator carries the rope sleeve, the insulating pulley and the insulating rope to climb the tower to a pole tower operation area, and the insulating pulley is arranged at a proper position;
c. the personnel on the tower installs the personal security line grounding end and the lead end, and the installation is stable and firm;
d. the device and the tool bag (personal safety line, adjustable spanner, ratchet spanner, hardware tool and the like) are bound on the control rope by a ground operator, the traction rope is pulled by the ground operator A, and the control rope is controlled by the ground operator B; when things reach the position of a tower climbing operator, the operator on the tower takes down the transfer objects and fixes the transfer objects on the tower;
e. the on-tower operators select proper overhead ground wire hardware fitting replacement parts according to the actual conditions of tower type, tower head size and the like, and reasonably combine the parts, and install and fix the parts at proper positions;
f. the overhead ground wire to be overhauled passes through the lifting hook, and the adjusting screw is adjusted to lift the overhead ground wire to be overhauled to a proper position;
g. the operators on the tower disassemble the old hardware fitting and install the new hardware fitting in place;
h. an operator on the tower adjusts the adjusting bolt (10) to restore the overhead ground wire to the original position;
i. dismantling the device and the personal security line;
j. binding the hardware tool changer and other hardware tools on the control rope firmly, and landing things to the ground by the cooperation of ground personnel, and removing the things by the ground personnel;
k. the on-tower operator checks whether there are remnants on the tower and whether the hardware fitting is installed in place: after checking no problem, removing the rope sleeve, the pulley and the insulating rope and bringing the rope sleeve, the pulley and the insulating rope to the ground;
firstly, collecting tools and instruments, checking carryover, and evacuating personnel;
the invention is calculated by the mechanics of the component
For the whole body of the invention, the mechanical model is shown in figure 2
Workload: 30KN
Material quality: 7A04
σs＝412Mpa
σb＝490MPa
Center moment of the fixture: 250mm as can be seen from figure 2, there is a maximum bending moment at the A-A section, so this section is calculated as the main one.
Intensity calculation at section A-A:
the cross-sectional structure at a.A-A is shown in FIG. 3
The section moment of inertia is calculated as: ia= 830929.151 (mm 4)
The flexural section modulus of this section is w=31474.59 mm3
b. The bending moment applied to this section is:
M＝(P/2)×60＝900000N.mm
the bending stress on this section is:
σ＝M/W
σ＝28.59Mpa<σs＝412Mpa/2.5＝164.8Mpa
intensity calculation at section B-B:
the cross-sectional structure at B-B is shown in FIG. 4
The section moment of inertia is calculated as: ia= 2732461.751 (mm 4) then the flexural section modulus of this section is w=70063.1 mm3b the bending moment applied to this section is:
M＝(P/2)×145＝2175000N.mm
the bending stress on this section is:
σ＝M/W
σ＝31Mpa<σs＝412Mpa/2.5＝164.8Mpa
and (3) calculating the lug section of the clamp body:
the cross section of the tab is as shown in fig. 5:
the section is easily sheared here, so the section is mainly calculated by shearing.
Shear area a=1489.277 mm2
Shear force P/2=30000/2=15000N
So the shear stress is delta shear=15000/1489.277 =10mpa
Taking a safety factor of 2.5, the allowable shear stress of 7a04 is:
δallowance=412×0.6/2.5=98.88 MPa > δshear=10 MPa
It can be seen that the strength of the section is sufficiently safe.
And (3) calculating the shearing section of the clamping seat:
the cross section is as in fig. 6:
the section is easily sheared here, so the section is mainly calculated by shearing.
Shear area a=1302.75mm2
Shear force P/2=30000/2=15000N
So the shear stress is delta shear=15000/1302.75 =11.5 MPa
Taking a safety factor of 2.5, the allowable shear stress of 7a04 is:
a workload; 30KN
Material quality: 7A04
σs＝412Mpa
σb＝490MPa
Center moment of the fixture: 440mm
δallowance=412×0.6/2.5=98.88 MPa > δshear=11.5 MPa
It can be seen that the strength of the section is sufficiently safe.
Calculation of the screws used:
since the screws here are self-made bolts of M14 and M16. The work strength is sufficient for factory standard, and the calculation is omitted.
Main section strength calculation of the accessory body:
for the whole body of the present invention, the mechanical model is as shown in fig. 7:
from the above figures it can be seen that there is a maximum bending moment at the A-A section, so the calculation of this section is dominant.
Intensity calculation at section A-A:
1) The cross-sectional structure at A-A is shown in FIG. 8
The section moment of inertia is calculated as: ia= 861001.147 (mm 4)
The flexural section modulus of this section is w=32368.46 mm3
2) The bending moment applied to this section is:
M＝(P/2)×60＝900000N.mm
the bending stress on this section is:
σ＝M/W
σ＝27.8Mpa<σs＝412Mpa/2.5＝164.8Mpa
intensity calculation at section B-B:
1) The cross-sectional structure at B-B is shown in FIG. 9
The section moment of inertia is calculated as: ia= 2729636.284 (mm 4)
The flexural section modulus of this section is w=70351.45 mm3
2) The bending moment applied to this section is:
M＝(P/2)×170＝2550000N.mm
the bending stress on this section is:
σ＝M/W
σ＝36.25Mpa<σs＝412Mpa/2.5＝164.8Mpa
the lug structure of the accessory main body is identical with that of the clamp main body, so that the strength meets the requirement.
Main section strength calculation of accessory clamping seat
The cross section is as shown in fig. 10:
the section is easily sheared here, so the section is mainly calculated by shearing.
Shear area a=1371.447 mm2
Shear force P/2=30000/2=15000N
So the shear stress is delta shear=15000/1371.448 =10.94 MPa
Taking a safety factor of 2.5, the allowable shear stress of 7a04 is:
δallowance=412×0.6/2.5=98.88 MPa > δshear=10.94 MPa
It can be seen that the strength of the section is sufficiently safe.
Calculation of the used screw rod:
the screw rod is a self-made screw rod, and is specifically calculated as follows:
the screw rod adopts T20 multiplied by 4 trapezoidal threads, the material is high-quality carbon alloy steel 40Cr, and the stress form is a tension-torsion combination.
Torque calculation on the screw rod:
T＝F×tg(λ+Ψv)d2/2
lambda-screw lead screw helix angle;
ψv-equivalent friction angle;
d2-screw thread pitch diameter;
T＝25650N.mm
and (5) calculating torsional shear stress of the screw rod:
σca＝√(F)2+3(4T/d1)2/(πd12/4)
d1-screw thread bottom diameter
＝130.87N/mm2
And (5) calculating tensile stress of the screw rod:
sigma-Lax= (F)/(pi d 12/4)
＝47.77N/mm2
Calculating the composite stress born by the screw rod:
by the third intensity theory:
sigma = vsigma is drawn 2+3σca2
＝231.51N/mm2＜[σs]/2.5＝314
The screw thread strength of the screw rod meets the requirement.
And (3) calculating a screw rod fork head:
the end of the screw rod fork head is sheared.
The stretched cross-sectional area is:
A＝332
the section is stressed as follows:
σ＝(F)/A
=45.18N/mm 2 < [ sigma-shear ] =980×0.6/2.5=235N/mm 2
The strength of the fork head meets the use requirement.
The strength of the screw rod meets the requirement.
Conclusion:
from the above calculations, it can be seen that the inventive subject matter works safely at a work load of 30KN and can guarantee a 2.5 times safety factor.
The invention has the beneficial effects that:
direct economic benefits
Reducing electricity selling loss
According to the current overhaul condition, seven overhead ground wire suspension clamps are required to be replaced every year, wherein the 110kV line is replaced by five suspension clamps, and the 35kV line is replaced by two suspension clamps. Data provided on schedule: at present, the load of each 110kV line is 15.7 ten thousand kW, the load of each 35kV line is 6.3 ten thousand kW, the overhead ground wire suspension clamp replacement operation is not applicable, the power failure operation is needed, the average time of each maintenance operation is 5 hours (including the in-station switching operation, the work permission, the maintenance operation and the work termination operation, and the power transmission recovery), namely the maintenance operation needs to lose 91.1 ten thousand Kw.h of power supply, and the economic benefit can be directly created every year by 0.5 yuan per degree of electricity.
Indirect economic benefits
Reducing the number of operators
The method for changing the suspension clamp of the traditional power transmission overhead ground wire is changed, and a tool with wide application range and labor cost saving is created. The use of the tool only needs one to two persons to operate on the tower, and only needs three persons to assist operation (one person to monitor, one person to operate the pull rope and one person to operate the tail rope) on the ground, so that two to three persons of ground assisting persons can be saved.
The device has the advantages that the use of the tool is reduced, the manual lifting and the fixing of the overhead ground wire to be overhauled are replaced, the physical energy consumption of the tower and ground operators is greatly reduced, the physical energy requirement on the operators is reduced, the situation that the overhead ground wire is fixed and does not firmly drop to a wire in the overhauling process is avoided, and the power supply reliability is greatly improved.
The tool is simple in structure, convenient to install and free of redundant personnel, the on-tower operators can install and fix only by fastening two bolts connected with the base and the main body, and the overhead ground wire to be overhauled can be lifted and lowered only by operating the adjusting bolts, so that a large amount of time required by manual lifting is greatly reduced, and the time for each overhauling operation can be averagely saved by 0.35h.
The invention has the advantages that the social benefit is that the work of replacing the overhead ground wire suspension clamp of the power transmission line can be carried out annually in enterprises, the reliability of line power supply is seriously affected, and the safety benefit and the social benefit of the invention are mainly represented as follows: the tool is used for replacing the overhead ground wire suspension clamp to be overhauled, is not influenced by factors such as overhauling environment, tower type and cross arm length, can greatly improve the stability of overhead ground wire fixation in the operation process, and improves the safety of lines and operators; meanwhile, the personnel cost and the operation time can be saved, and the yield and efficiency are realized. The development of the tool greatly improves the running stability of the line and shows the brand strength of the Xinin power supply company.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a cross-sectional view of a body;
FIG. 3 is a cross-sectional view of the body at the A-A plane;
FIG. 4 is a cross-sectional view of the main body from the B-B side;
FIG. 5 is a partial enlarged view of a bayonet location, which is a cross-sectional view of the tab;
FIG. 6 is a cross-sectional view of a cartridge;
FIG. 7 shows a main body mechanical model of the accessory, wherein two ears are arranged on two sides of the main body mechanical model with P as a center;
FIG. 8 is a cross-sectional view of the attachment taken along the A-A plane;
FIG. 9 is a B-B side cross-sectional view of the attachment;
FIG. 10 is a cross-sectional view of an accessory;
reference numerals: 1, a body, 2, a fixed shaft, 3, bolts A,4, clamping grooves, 5, bolts B,6, clamping seats, 7, tower clamping grooves, 8, a bottom plate, 9, tower, 10, adjusting bolts, 11, lifting hooks, 12, anti-falling clamping plates, 13, anti-torsion devices, 14, anti-torsion screw rods, 15, bayonets, 16 and rocker arms.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings;
the utility model provides a transmission line overhead ground wire gold utensil change ware which characterized in that: the body (1) bottom is provided with fixed axle (2), fixed axle (2) insert in draw-in groove (4) that clamping seat (6) top set up and through bolt A (3) fixed, the tip of clamping seat (6) still is provided with bolt B (5), bolt B (5) are connected bottom plate (8) and clamping seat (6) as an organic wholely, clamping seat (6) bottom is provided with tower material draw-in groove (7), tower material draw-in groove (7) card is on tower material (9) and is fixed through adjusting bolt (10) that set up on bottom plate (8), one side of body (1) still is provided with bayonet socket (15), be provided with in bayonet socket (15) anti-torsion lead screw (14), the upper end of anti-torsion lead screw (14) is connected with rocking arm (16), the bottom of anti-torsion lead screw (14) is connected with lifting hook (12) through anti-torsion device (13).
The fixed shaft (2) is horizontally provided with bolt holes in two directions, and the bolt holes in the two directions are intersected at 90 degrees.
The cross section of the lug part (17) is I-shaped.
The fixed shaft (2) is cylindrical or square in shape.
The fitting changer is made of 7A04 aluminum alloy.
Claims (5)
1. The utility model provides a transmission line overhead ground wire gold utensil change ware which characterized in that: the bottom of the body (1) is provided with a fixed shaft (2), the fixed shaft (2) is inserted into a clamping groove (4) formed in the top of the clamping seat (6) and is fixed through a bolt A (3), the end part of the clamping seat (6) is further provided with a bolt B (5), the bottom plate (8) and the clamping seat (6) are connected into a whole by the bolt B (5), the bottom of the clamping seat (6) is provided with a tower material clamping groove (7), the tower material clamping groove (7) is clamped on a tower material (9) and is fixed through an adjusting bolt (10) arranged on the bottom plate (8), one side of the body (1) is further provided with an ear (17), the ear (17) is provided with a bayonet (15), an anti-torsion screw (14) is arranged in the bayonet (15), the upper end of the anti-torsion screw (14) is connected with a rocker arm (16), the bottom of the anti-torsion screw (14) is connected with a lifting hook (11) through an anti-torsion device (13), and an anti-drop clamping plate (12) is arranged at the bottom end of the lifting hook (11). The clamping seat (6) is arranged above the tower material (9) to be installed, firmly wraps the tower material (9), is one of main components for installation and fixation of the whole suspension clamp replacement device, mainly uses bending shear force in the use process, ensures firm installation and normal use of the whole tool, has bearing performance not less than 30KN and mechanical strength more than 500kN/cm 2 The clamping seat (6) is forged by 7A04 aluminum alloy;
the bottom plate (8) is arranged on the tower material (9) to be installedThe lower part of the whole suspension clamp replacement device is the installation foundation, and the suspension clamp replacement device is mainly subjected to bending shear force in the use process, so that the bearing performance of the suspension clamp replacement device is not less than 30KN and the mechanical strength of the suspension clamp replacement device is more than 500kN/cm in order to ensure the firm installation and normal use of tools 2 The bottom plate (8) is forged by 7A04 aluminum alloy;
the anti-torsion screw (14) is used for lifting and fixing the overhead ground wire, the bearing performance is not less than 30KN, and the mechanical strength is more than 500kN/cm 2 The anti-torsion screw rod is forged by 7A04 aluminum alloy;
the lifting hook (11) is directly connected with the anti-torsion screw rod (14) and is used for hanging the overhead ground wire, lifting, dropping and fixing the overhead ground wire, and the lifting hook is subjected to the gravity of the overhead ground wire and the oblique pulling force on two sides in the use process, so that the tool is firmly installed and normally used, the bearing performance is not less than 30KN, and the mechanical strength is more than 500kN/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The lifting hook is formed by forging 7A04 aluminum alloy;
part mechanics calculation of overhead ground wire hardware fitting replacement device of power transmission line
For the whole power transmission line overhead ground wire hardware fitting changer, a mechanical model is as follows:
workload: 30KN
Material quality: 7A04 aluminium alloy
σs=412Mpa
Ear section calculation of the fixture body:
mainly uses the shearing calculation of the section where the ear is easy to shear;
shear area a= 1489.277mm 2
Shear force P/2=30000/2=15000N
So the shear stress is delta Shear with cutting edge =15000/1489.277=10MPa
Taking the safety factor as 2.5, the allowable shear stress of the lug is as follows:
δ permit(s) =412×0.6/2.5=98.88MPa >δ Shear with cutting edge =10MPa
And (3) calculating the shearing section of the clamping seat:
mainly uses the shearing calculation of the section of the clamping seat which is easy to shear;
shear area a= 1302.75mm 2
Shear force P/2=30000/2=15000N
So the shear stress is delta Shear with cutting edge =15000/ 1302.75 =11.5MPa
Taking the safety coefficient as 2.5, the allowable shearing stress of the clamping seat of the clamp is as follows:
δ permit(s) =412×0.6/2.5=98.88MPa >δ Shear with cutting edge =11.5MPa
Calculation of the screws used:
the screws are self-made bolts of M14 and M16, are factory standard pieces, and have enough working strength;
from the calculation, the power transmission line overhead ground wire hardware fitting changer works safely when the work load is 30KN, and can ensure a safety factor of 2.5 times.
2. The power transmission line overhead ground wire fitting changer according to claim 1, wherein the fixed shaft (2) is horizontally provided with bolt holes in two directions, and the bolt holes in the two directions intersect at 90 degrees.
3. The power transmission line overhead ground wire fitting changer according to claim 1, characterized in that the cross-sectional view of the ear (17) is i-shaped.
4. The power transmission line overhead ground wire fitting changer according to claim 1, wherein the fixed shaft (2) is cylindrical or square in shape.
5. The power transmission line overhead ground wire fitting changer according to claim 1, wherein the fitting changer is made of 7a04 aluminum alloy.
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| CN202111409508.3A CN114156774B (en) | 2021-11-25 | 2021-11-25 | Power transmission line overhead ground wire fitting replacement device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111409508.3A CN114156774B (en) | 2021-11-25 | 2021-11-25 | Power transmission line overhead ground wire fitting replacement device |
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| CN114156774A CN114156774A (en) | 2022-03-08 |
| CN114156774B true CN114156774B (en) | 2023-05-26 |
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| GB9324706D0 (en) * | 1992-12-02 | 1994-01-19 | Sahlins Clydesdale Ltd | Lifting device and method |
| JP2005184927A (en) * | 2003-12-17 | 2005-07-07 | Kansai Electric Power Co Inc:The | Device for lifting overhead wire |
| CN113376032A (en) * | 2021-07-08 | 2021-09-10 | 西京学院 | Double-glue-layer shear test die and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2415838B (en) * | 2004-07-01 | 2008-05-21 | Abb Offshore Systems Ltd | Cable connection |
| CN102237655A (en) * | 2011-07-05 | 2011-11-09 | 河南省电力公司洛阳供电公司 | Method and tool for lifting overhead ground wire |
| CN104752995B (en) * | 2015-04-16 | 2017-03-01 | 国网四川蓬溪县供电有限责任公司 | Replacing insulator aid and the method using this tool changing insulator |
| CN204927971U (en) * | 2015-08-28 | 2015-12-30 | 国家电网公司 | A embrace pole for electrified insulator chain that changes of transmission line |
| CN111834953A (en) * | 2020-08-11 | 2020-10-27 | 中国南方电网有限责任公司超高压输电公司柳州局 | Ground wire mechanical power climbing device |
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2021
- 2021-11-25 CN CN202111409508.3A patent/CN114156774B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9324706D0 (en) * | 1992-12-02 | 1994-01-19 | Sahlins Clydesdale Ltd | Lifting device and method |
| JP2005184927A (en) * | 2003-12-17 | 2005-07-07 | Kansai Electric Power Co Inc:The | Device for lifting overhead wire |
| CN113376032A (en) * | 2021-07-08 | 2021-09-10 | 西京学院 | Double-glue-layer shear test die and operation method thereof |
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| CN114156774A (en) | 2022-03-08 |
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