CN113054452B - Coaxial round rod conductor wedge self-locking device and construction method thereof - Google Patents
Coaxial round rod conductor wedge self-locking device and construction method thereof Download PDFInfo
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- CN113054452B CN113054452B CN202011602300.9A CN202011602300A CN113054452B CN 113054452 B CN113054452 B CN 113054452B CN 202011602300 A CN202011602300 A CN 202011602300A CN 113054452 B CN113054452 B CN 113054452B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
- H01R4/5083—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a wedge
- H01R4/5091—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a wedge combined with a screw
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
- H01R11/09—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations being identical
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/027—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for connecting conductors by clips
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Abstract
The invention discloses a coaxial round bar conductor wedge self-locking device and a construction method thereof, and the coaxial round bar conductor wedge self-locking device comprises an anchor ear, a pressing plate, an embedded ring and a wedge which are all conductive, wherein a square through hole is formed in the length direction of the anchor ear, a semi-circular through groove I is arranged in the middle of the bottom side of the square through hole in the length direction, the pressing plate is arranged in the square through hole, a semi-circular through groove II is arranged in the middle of the bottom side, steps are arranged on two sides of the pressing plate, four die drawing surfaces are arranged on the upper surface of each step, four die drawing grooves are arranged on the upper side surfaces of two ends in the square through hole, the four die drawing surfaces and the four die drawing grooves form four rectangular wedge grooves respectively, the four wedges are four and are respectively inserted into the four rectangular wedge grooves, a notch is axially formed in the embedded ring, and the two wedges are respectively and are arranged in two ends of a round hole formed between the anchor ear and the pressing plate in an elastic manner. The invention can realize the coaxial connection structure of the round rod conductor, the contact resistance and the stress at the connection part are reduced, the conductor contact surface of the wiring device is not subjected to gap loosening and oxidation after cold and hot circulation, and the reliability of the connection device is improved.
Description
Technical Field
The invention belongs to the technical field of coaxial round bar conductor connecting hardware fittings, and particularly relates to a coaxial round bar conductor wedge self-locking device and a construction method thereof.
Background
The traditional pole holding wire clamp is also called a hoop wire clamp, a pile head holding pole and a screw terminal wire clamp (see DL/T765.3), is used for connecting a transformer, a pole-mounted switch and the like with a lead and other equipment, has higher requirement on current carrying capacity due to the main function of transmitting current, and is made of copper and copper alloy. The cable clamp is fastened by a bolt to bear pre-tightening stress, has certain requirements on the mechanical property of alloy, but the cable clamp of the type is an accessory part of matched equipment, and generally meets the requirements after passing a temperature rise test in acceptance, as shown in figure 28.
Because of the structure, the shape of the pole holding wire clamp is equivalent to a section of longitudinally split pipe, and the pole holding wire clamp is fastened by steel bolts and then has defects in several aspects:
1) The hoop stress distribution of the pole holding wire clamp hoop is discontinuous, the holding pressure of the pole holding wire clamp hoop and the round rod conductor is uncontrollable, the yield meshing area of the pole holding wire clamp hoop and the round rod conductor is easily insufficient, the contact resistance is too large, the heating is caused, and the high-voltage electrical equipment fault is caused;
2) Because the anchor ear bolt shoulder of the pole holding wire clamp extends out of the anchor ear, when the bolt is fastened, the transition part of the anchor ear bolt shoulder and the anchor ear bears great shearing stress, and the crystal grains of materials such as brass and the like are large, the anchor ear shoulder of the pole holding wire clamp is easy to crack, so that the pole holding wire clamp is broken, and the high-voltage electrical equipment is in failure;
3) In order to ensure that the traditional holding pole wire clamp hoop has enough holding force on a round pole conductor, the pre-tightening force of the hoop fastening bolt is large, a steel bolt above 4.8 grade must be used, because the steel bolt is different from the holding pole wire clamp material, the yield strength and the thermal expansion coefficient are far different, after the holding pole wire clamp runs for a certain time, the fastening position of the holding pole wire clamp bolt is loosened due to the change of the environmental temperature, the contact resistance between the holding pole wire clamp hoop and the round pole conductor is increased, the heating is caused, and the fault of high-voltage electrical equipment is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a coaxial round rod conductor wedge self-locking device and a construction method thereof, which are used for solving the problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a coaxial pole conductor wedge self-locking ware, including the staple bolt that is the same conducting material, clamp plate and wedge, still include electrically conductive caulking ring, the staple bolt is bar structure, length direction has seted up the square through-hole, square through-hole length direction bottom side middle part is provided with the logical groove of semicircle one, the clamp plate is arranged in the square through-hole, length direction bottom side middle part is provided with the logical groove of semicircle two, the clamp plate both sides are provided with the step, the step upper surface is provided with four drawing die surfaces of symmetry, the side is provided with four drawing die grooves that correspond with four drawing die surfaces on the both ends in the square through-hole, four drawing die surfaces and four drawing die grooves form four rectangle wedge grooves respectively, the wedge adopts four, insert four rectangle wedge groove fixed staple bolts and clamp plate respectively, the caulking ring axial is provided with the breach, the caulking ring adopts two and places in the round hole both ends that constitute between staple bolt and the clamp plate in elasticity respectively and encircles two pole conductors respectively.
Preferably, each wedge is fastened on the inner end side of the die drawing groove on the anchor ear by penetrating the assembling screw along the length direction of the wedge.
Preferably, the middle part of the upper side of the hoop is transversely provided with a U-shaped notch.
Preferably, the middle part of the pressure plate and the hoop are positioned by positioning set screws.
A construction method of a coaxial round bar conductor wedge self-locking device comprises the following steps: the clamp plate penetrates into the hoop, a positioning set screw is installed to form a round bar conductor connector, four drawing surfaces of the hoop and four drawing surfaces of the clamp plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor penetrates into an embedded ring, the embedded ring penetrates into one end of the round bar conductor connector, and the round bar conductor is rotated to enable the round bar conductor and the embedded ring to be clamped in the round bar conductor connector; the other round bar conductor penetrates into the other embedded ring, the embedded ring penetrates into the other end of the round bar conductor connector, the round bar conductor is rotated to enable the round bar conductor and the embedded ring to be clamped in the round bar conductor connector, the two wedges are inserted into the two rectangular wedge grooves at one end of the round bar conductor connector, and the two assembling screws respectively penetrate into the wedges and screw holes at the bottoms of the drawing die grooves on the anchor ears to be tightened, so that the embedded ring is pressed by the pressing plate; two wedges are inserted into two rectangular wedge grooves at the other end of the round bar conductor connector, two assembling screws are respectively penetrated into the wedges and screw holes at the bottoms of the drawing die grooves on the anchor ears to be tightened, so that the embedded rings are pressed by the pressing plate, and the two embedded rings, the two round bar conductors, the anchor ears and the pressing plate form a low-resistance current path capable of bearing tension.
The radial stress that staple bolt and clamp plate circular arc section need when crimping wedge locking:
in the formula (2), the reaction mixture is,
P cmax radial stress of the hoop and the circular arc section of the pressing plate in unit MPa;
R i0.2 the yield strength of the insert ring in MPa.
The minimum wall thickness that staple bolt and clamp plate circular arc section need:
in the formula (2), the reaction mixture is,
P cmax radial stress of the hoop and the circular arc section of the pressing plate in unit MPa;
D i -the inner diameter of the circular arc segment in mm;
δ cmin calculating the wall thickness in unit mm by using the hoop and the circular arc section of the pressing plate;
R c0.2 -hoop and platen material yield strength in MPa;
lowest axial pretension force F of each wedge min ：
If the wedge is expanded at a constant speed in the expansion process, the wedge is subjected to five forces, namely a thrust F, a pressure N on the side surface of the inner end of the drawing die groove, a friction force F on the side surface of the inner end of the drawing die groove and a pressure N on the drawing die surface of the pressing plate b Pressure plate drawing surface friction force f b According to the balance of forces, there are:
F＝fcosβ+Nsinβ+f b cosβ+N b sinβ (3)
f＝μN (4)
f b ＝μN b (5)
Ncosβ+f b sinβ＝N b cosβ+fsinβ (6)
wherein mu- - - -the coefficient of friction of two die faces;
beta- - -wedge draft angle, unit degree;
deducing by formulas (3) to (6) to obtain that the relationship between the axial thrust of the wedge and the pressure of the hoop drawing die surface is as follows:
F＝2N(μcosβ+sinβ) (7)
side area of the insert ring
S＝2rπl (8)
In the formula (8), the reaction mixture is,
r-is the inner radius of the thimble, unit mm;
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
after expansion the radial stress of the insert ring is
In the formula (9), the reaction mixture is,
P c -the radial stress of the insert ring after expansion, in MPa;
α - -diameter of the round bar conductor in mm;
R i0.2 - -the yield strength of the thimble, in MPa;
to meet the conductive current-carrying capacity of the semi-arc groove inner interface, the engagement yield area of the semi-arc groove inner interface material must be larger than the sectional area of the round rod wiring terminal. In order to ensure good conductivity, the safety coefficient is 1.5. And (7) putting the formula (9) into the formula (7), wherein the lowest axial pretightening force of each wedge is as follows:
F min ≥2krπlR i0.2 (μcosβ+sinβ) (10)
in the formula (10), the reaction mixture is,
k- -safety factor, 1.5;
α - -diameter of the round bar conductor in mm;
R i0.2 - -the yield strength of the thimble, in MPa;
mu- - - -coefficient of friction of the pattern drawing surface.
Upper limit axial pretightening force F of each wedge max ：
The hoop compression beam shear stress cannot be greater than 0.5 times of the hoop material yield strength, then:
in the formula (14), l represents the length of the embedded ring in mm;
R c0.2 -hoop and platen material yield strength in MPa;
t- - -actual minimum thickness of the anchor ear, unit mm;
n- - -hoop drawing die face pressure, unit Newton;
beta- - -wedge draft angle, unit degree;
bringing formula (11) into formula (7)
In the formula (12), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
R c0.2 -hoop and platen material yield strength in units MPa;
t- - -actual minimum thickness of the anchor ear, unit mm;
beta-wedge draft angle, unit degree.
Draft angle when wedge is auto-locked:
assuming that the wedge is self-locked and stopped in the anchor ear after stopping expansion, the wedge is acted by four forces, namely the pressure N of the inner end side surface of the die drawing groove, the friction force f of the inner end side surface of the die drawing groove and the pressure N of the die drawing surface of the pressure plate i Pressure plate drawing surface friction force f i The radial strain of each part (except the thrust direction) caused by the expansion pressure is not changed, namely the pressure N i Has not been changed, i.e.
f＝μN (13)
f i ＝μN i (14)
N i sinβ+Nsinβ＝f i cosβ+fcosβ (15)
Mu in formula (14) -the friction coefficient between two die drawing surfaces (the friction coefficient between the anchor ear and the wedge die drawing surface or between the press plate and the wedge die drawing interface is the same as the friction coefficient between the anchor ear and the wedge die drawing surface or between the press plate and the wedge die drawing interface);
N i -the pressure of the die drawing surface of the press plate in newtons;
f i -the friction of the die-drawing surface of the press plate in newtons;
because the pressures of the two drawing die surfaces of the wedge are equal, the wedge is self-locked in a connected anchor ear after expansion is stopped, and the critical condition is that
tgβ≤μ。 (16)
The invention has the beneficial effects that: compared with the prior art, the invention provides a brand-new high-voltage electrical equipment round bar conductor connecting device aiming at a coaxial connecting structure of a strain clamp round bar connecting terminal of an overhead transmission line or a transformer substation overhead bus T-shaped wire clamp round bar connecting terminal and a lower side drainage wire round bar connecting terminal, so that the connecting device and a round bar conductor can generate interference fit with enough area, and the contact resistance is reduced; the connecting device has the advantages that heterogeneous materials are not used as a bearing part of the connecting device, excessive stress of the connecting device is avoided, the main body of the connecting device is ensured to be in an elastic range, and through self-compensation, the conductor contact surface of the connecting device after cold and hot circulation cannot be subjected to gap loosening oxidation, so that the reliability of the connecting device is improved.
Drawings
FIG. 1 is a schematic top view of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 2 is a front view of the coaxial round bar conductor wedge self-locking tension connector;
FIG. 3 is a left side view schematic diagram of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 4 is a schematic diagram of a wedge subjected to five forces;
FIG. 5 is a schematic side view of the wedge;
FIG. 6 is a schematic view of the self-locking of the wedge under force;
FIG. 7 is a front view of the insert ring;
FIG. 8 is a side view of the insert ring;
FIG. 9 is a schematic view of a three-dimensional structure of the hoop;
FIG. 10 is a schematic view of the bottom view of the hoop;
FIG. 11 is a front view of the hoop;
FIG. 12 is a schematic view of a top view of the hoop;
FIG. 13 isbase:Sub>A schematic sectional view taken along line A-A in FIG. 10;
FIG. 14 is a schematic cross-sectional view taken at 0-0 of FIG. 13;
FIG. 15 is a left side view of the hoop;
FIG. 16 is a schematic cross-sectional view of FIG. 12 taken at 8-8;
FIG. 17 is a bottom view of the pressure plate;
FIG. 18 is a front view of the platen;
FIG. 19 is a left side view of the platen;
FIG. 20 isbase:Sub>A schematic sectional view taken along line A-A in FIG. 19;
FIG. 21 is a schematic cross-sectional view of B-B of FIG. 18;
FIG. 22 is a schematic side view of the wedge;
FIG. 23 is a schematic structural view of the front end face of the wedge;
FIG. 24 is a schematic view of the rear end face structure of the wedge;
FIG. 25 is a schematic perspective view of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 26 is a front view of the round bar conductor;
FIG. 27 is a schematic bottom view of the round bar conductor;
fig. 28 is a schematic perspective view of a conventional pole holding clamp.
Detailed Description
The invention is further described below with reference to specific figures and embodiments.
Example 1: as shown in fig. 1-27, a coaxial round bar conductor wedge self-locking device comprises an anchor ear 1, a pressing plate 2 and a wedge 4 which are made of the same conductive material, and further comprises a conductive embedded ring 3, wherein the anchor ear 1 is of a strip structure, a square through hole 8 is formed in the length direction, a first half-arc through groove 9 is formed in the middle of the bottom side of the square through hole 8 in the length direction, the pressing plate 2 is arranged in the square through hole 8, a second half-arc through groove 12 is formed in the middle of the bottom side of the length direction, steps are arranged on two sides of the pressing plate 2, four symmetrical die drawing surfaces 13 are arranged on the upper surface of each step, four die drawing grooves 14 corresponding to the four die drawing surfaces 13 are arranged on the upper side surface of each end in the square through hole 8, the four die drawing surfaces 13 and the four die drawing grooves 14 respectively form four rectangular wedge grooves, the four wedges 4 are respectively inserted into the four rectangular wedge grooves to fix the anchor ear 1 and the pressing plate 2, a notch 10 is axially arranged on the embedded ring 3, and the embedded ring covers the two round bar conductors 6 respectively.
Preferably, each wedge 4 is inserted into a threaded hole 16 of an inner end connecting plate 15 of the die drawing groove 14 on the anchor ear 1 along the length direction of the wedge 4 by using an assembling screw 5.
Preferably, the middle part of the upper side of the hoop 1 is transversely provided with a U-shaped notch 7.
Preferably, a positioning set screw 11 is used for positioning between the middle part of the pressure plate 2 and the hoop 1.
Example 2: a construction method of a coaxial round bar conductor wedge self-locking device comprises the following steps: the clamp plate penetrates into the hoop, the positioning set screw is installed to form the round bar conductor connector, the four drawing surfaces of the hoop and the four drawing surfaces of the clamp plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor penetrates into an embedded ring, the embedded ring penetrates into one end of the round bar conductor connector, and the round bar conductor is rotated to enable the round bar conductor and the embedded ring to be clamped in the round bar conductor connector; the other round bar conductor penetrates into the other embedded ring, the embedded ring penetrates into the other end of the round bar conductor connector, the round bar conductor is rotated to enable the round bar conductor and the embedded ring to be clamped in the round bar conductor connector, the two wedges are inserted into the two rectangular wedge grooves at one end of the round bar conductor connector, and the two assembling screws respectively penetrate into the wedges and screw holes at the bottoms of the drawing die grooves on the anchor ears to be tightened, so that the embedded ring is pressed by the pressing plate; two wedges are inserted into two rectangular wedge grooves at the other end of the round bar conductor connector, two assembling screws are respectively penetrated into the wedges and screw holes at the bottoms of the drawing die grooves on the anchor ear to be tightened, so that the embedded rings are tightly pressed by the pressing plate, and the two embedded rings, the two round bar conductors, the anchor ear and the pressing plate form a low-resistance current path capable of bearing tension.
The radial stress that staple bolt and clamp plate circular arc section need when crimping wedge locking:
in the formula (1), the reaction mixture is,
P cmax radial stress of the hoop and the circular arc section of the pressing plate;
R i0.2 -yield strength of the insert ring.
The minimum wall thickness required by the hoop and the circular arc section of the pressing plate is as follows:
in the formula (2), the reaction mixture is,
P cmax radial stress of the hoop and the circular arc section of the pressing plate;
D i -inner diameter of the circular arc segment;
δ cmin -calculating the wall thickness of the hoop and the circular arc section of the pressing plate;
R c0.2 -hoop and platen material yield strength;
lowest axial pretightening force F of each wedge min ：
As shown in FIGS. 4-5, if the wedge is uniformly expanded during expansion, the wedge is subjected to five forces, i.e., a thrust force F, a pressure N on the inner end side surface of the pattern drawing groove, a friction force F on the inner end side surface of the pattern drawing groove, and a pressure N on the pattern drawing surface of the pressure plate b The friction force f of the die drawing surface of the pressing plate b According to the balance of forces, there are:
F＝f cosβ+N sinβ+f b cosβ+N b sinβ (3)
f＝μN (4)
f b ＝μN b (5)
N cosβ+f b sinβ＝N b cosβ+f sinβ (6)
wherein μ - - - -the coefficient of friction of the two draft surfaces, as shown in Table 1;
beta-wedge draft angle;
the relationship between the axial thrust of the wedge and the pressure of the hoop drawing die surface is obtained by derivation of formulas (3) to (6):
F＝2N(μcosβ+sinβ) (7)
TABLE 1 machined die face Friction factor
| Substances rubbing against each other | Coefficient of friction |
| Brass to brass machined surface | 0.12 |
| Machined surface of bronze to bronze | 0.07 |
| Machined surface of steel-on-steel machine | 0.1 |
| Machined surface of aluminum alloy to aluminum alloy | 0.18 |
Side area of the insert ring
S＝2rπl (8)
In the formula (8), the reaction mixture is,
r-is the inner radius of the insert ring;
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
after expansion the radial stress of the insert ring is
In the formula (9), the reaction mixture is,
P c -the radial stress of the ring after expansion;
α - -round bar conductor diameter;
R i0.2 -yield strength of the insert ring;
to meet the conductive current-carrying capacity of the semi-arc groove inner interface, the engagement yield area of the semi-arc groove inner interface material must be larger than the sectional area of the round rod wiring terminal. In order to ensure good conductivity, the safety coefficient is 1.5. And (7) putting the formula (9) into the formula (7), wherein the lowest axial pretightening force of each wedge is as follows:
F min ≥2krπlR i0.2 (μcosβ+sinβ) (10)
in the formula (10), the compound represented by the formula (10),
k- -safety factor, 1.5;
α - -round bar conductor diameter;
R i0.2 -yield strength of the insert ring;
mu- - - -coefficient of friction of the pattern drawing surface.
Upper limit axial pretightening force F of each wedge max ：
In order to ensure the safety of the anchor ear and the pressing plate, the shear stress of the anchor ear pressing beam can not be more than 0.5 time of the yield strength of the anchor ear material except for the conductive current-carrying capacity of the expansion section, and then:
in formula (14), l represents the length of the thimble;
R c0.2 -hoop and platen material yield strength;
t-actual minimum hoop thickness;
n-hoop drawing die face pressure;
beta-wedge draft angle;
bringing formula (11) into formula (7)
In the formula (12), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
R c0.2 -hoop and platen material yield strength;
t- - -actual minimum hoop thickness;
beta-wedge draft angle.
Drawing angle when the wedge is self-locked:
as shown in fig. 6, assuming that the wedge is self-locked in the anchor ear after stopping expansion, the wedge is acted by four forces, namely, the pressure N of the inner end side surface of the die drawing groove, the friction force f of the inner end side surface of the die drawing groove, and the pressure N of the die drawing surface of the pressure plate i Pressure plate drawing surface friction force f i The radial strain of each part (except the thrust direction) caused by the expansion pressure is not changed, namely the pressure N i Without change, i.e.
f＝μN (13)
f i ＝μN i (14)
N i sinβ+Nsinβ＝f i cosβ+fcosβ (15)
Mu- - - -coefficient of friction in equation (14) (the coefficient of friction between the die drawing surface of the press plate or the anchor ear film surface and the wedge is the same because the materials used are the same);
N i -pressure of the die drawing surface of the press plate;
f i -friction of the die drawing surface of the press plate;
because the pressures of the two drawing die surfaces of the wedge are equal, the wedge is self-locked in a connected anchor ear after expansion is stopped, and the critical condition is that
tgβ≤μ。 (16)
From the formula, the self-locking of the wedge is related to the friction coefficient of the contact material and the drawing angle and is unrelated to the axial pretightening force of the wedge. Through calculation and experimental verification, the self-locking half-cone angles of the self-locking cone rings of brass, bronze, steel and aluminum alloy are shown in the table 2.
TABLE 2 several kinds of metal self-locking wedge draft angles
| Substances rubbing against each other | Friction factor of machined surface | Self-locking drawing angle |
| Brass to brass machined surface | 0.12 | ≦6.84 |
| Machined surface of bronze to bronze | 0.07 | ≦4.0 |
| Machined surface of steel-to-steel machine | 0.1 | ≦5.71 |
| Machined surface of aluminum alloy to aluminum alloy | 0.18 | ≦10.20 |
Round bar conductor structure: as shown in fig. 26-27, the tension round bar conductor is made of soft pure metal with similar material. Copper designation T1, yield strength R 0.2 Not higher than 70MPa; aluminum alloy 1A99, yield strength R 0.2 Not higher than 45MPa; typical design parameters for the tension rod conductor are shown in table 3 (length units are mm).
Table 3:
the structure of the embedded ring is as follows: as shown in fig. 7-8, the insert ring is made of soft pure metal with similar material of the tension round rod conductor. Copper designation T1, yield strength R 0.2 Not higher than 70MPa; aluminum alloy 1A99, yield strength R 0.2 Not higher than 45MPa. The calculation formula of the typical design of the insert ring is as follows, and the parameters are shown in Table 4.
Table 4:
tension-connected anchor ear features that as shown in fig. 9-16, the anchor ear material for tension connection is processed from hard alloy with similar conductor material of tension round bar. The copper alloy is T2, and the yield strength is not lower than 160MPa; the aluminum alloy is 5A05, and the yield strength is not lower than 115MPa; the anchor ear is a rectangular wedge pressing structure of a long strip-shaped cylindrical sleeve, each parameter of the anchor ear in tension connection depends on the diameter alpha of a tension round bar conductor and the anchor ear draft plane draft angle beta, and a typical design calculation formula is as follows (length units are mm, and part of parameters are shown in table 5):
h0＝2t+2s1+a+2q1
h4＝2t
h6＝2t
h2＝t+2r+2q1+t+t＝3t+2r+2q1
h3＝h2-h6
h8＝t+r+q1
h9＝h8-0.3
h5＝t
h10＝2(l+a)
h11＝t
h14＝a
h15＝2a
k1＝1.5
m1＝a+2q1-2t
m2＝t
m3＝s1
table 5:
the pressing plate with tension connection has the structural characteristics that: as shown in fig. 17-21, the tension-connected platens are machined from hard alloys of nearly round bar conductor material. The copper alloy is T2, and the yield strength is not lower than 160MPa; the aluminum alloy grade is 5A05, the yield strength is not lower than 115MPa, the pressing plate is of a semicircular wedge pressing structure, all parameters of the pressing plate depend on the diameter alpha of the round bar conductor and the pressing plate drawing surface drawing angle beta, and a typical design calculation formula is as follows (the length unit is mm):
R3＝R1+t
d0＝2d6+a+2q1
d2＝d1-0.3
d3＝s1-0.1
d4＝R1+d6
d5＝a
d6＝s1-0.1
h10＝2(l+a)
h15＝2a
the structural characteristics of the wedge are as follows: as shown in fig. 22-24, the wedge is machined from a hard alloy that is nearly the same material as the round bar conductor. The grade of the copper alloy is T2, and the yield strength is not lower than 160MPa; the aluminum alloy is 5A05, and the yield strength is not lower than 115MPa. The bottom end side of the wedge through hole diameter P2 is a puller bolt hole, each parameter of the wedge depends on the round rod conductor diameter a and the pressing plate drawing surface drawing angle β, and typical design parameters are shown in table 6 (the length units are all mm).
Table 6:
the above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and therefore the scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A construction method of a coaxial round rod conductor wedge self-locking device is characterized in that: coaxial pole conductor wedge self-locking ware is including staple bolt (1) that is the same conducting material, clamp plate (2) and wedge (4), still include electrically conductive embedded ring (3), staple bolt (1) is bar structure, length direction has seted up square through-hole (8), square through-hole (8) length direction bottom side middle part is provided with half-arc through groove one (9), clamp plate (2) are arranged in square through-hole (8), length direction bottom side middle part is provided with half-arc through groove two (12), clamp plate (2) both sides are provided with the step, the step upper surface is provided with four drawing die surface (13) of symmetry, side is provided with four drawing die groove (14) that correspond with four drawing die surface (13) in square through-hole (8) both ends, four drawing die surface (13) and four drawing die groove (14) form four rectangle wedge grooves respectively, wedge (4) adopt four, insert respectively that four rectangle wedge groove fix staple bolt (1) and clamp plate (2) that four rectangle wedge grooves fixed, embedded ring (3) axial are provided with the conductor constitute from the anchor bolt (1) and clamp plate (2) in the construction respectively, the embedded ring (3) and the conductor constitute the method for two coaxial pole conductors in the anchor bolt (6) respectively: the clamp plate penetrates into the hoop, a positioning set screw is installed to form a round bar conductor connector, four die drawing grooves of the hoop and four die drawing surfaces of the clamp plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor penetrates into an embedded ring, the embedded ring penetrates into one end of the round bar conductor connector, and the round bar conductor is rotated to enable the round bar conductor and the embedded ring to be clamped in the round bar conductor connector; another round bar conductor penetrates into another embedded ring, the embedded ring penetrates into the other end of the round bar conductor connector, and the round bar is rotatedThe conductor, make round bar conductor, insert the ring in the round bar conductor connector, insert two wedges into two rectangular wedge grooves of one end of the round bar conductor connector, and penetrate the wedge and screw hole of the bottom of drawing die groove on the anchor ear and tighten up separately with two assembly screws, make the clamp plate compress tightly the insert ring; two wedges are inserted into two rectangular wedge grooves at the other end of the round bar conductor connector, two assembling screws are respectively penetrated into the wedges and screw holes at the bottoms of the drawing die grooves on the anchor ear for tensioning, so that the pressing plate compresses the embedded ring, and the lowest axial pretightening force F of each wedge min ：
If the wedge is expanded at a constant speed in the expansion process, the wedge is subjected to five forces, namely a thrust F, a pressure N on the side surface of the inner end of the drawing die groove, a friction force F on the side surface of the inner end of the drawing die groove and a pressure N on the drawing die surface of the pressing plate b Pressure plate drawing surface friction force f b According to the balance of forces, there are:
F＝fcosβ+Nsinβ+f b cosβ+N b sinβ (3)
f＝μN (4)
f b ＝μN b (5)
Ncosβ+f b sinβ＝N b cosβ+fsinβ (6)
wherein, mu- - - -coefficient of friction of the pattern drawing surface;
beta- - -wedge draft angle, unit degree;
deducing by formulas (3) to (6) to obtain that the relationship between the axial thrust of the wedge and the pressure of the hoop drawing die surface is as follows:
F＝2N(μcosβ+sinβ) (7)
side area of the insert ring
S＝2rπl (8)
In the formula (8), the reaction mixture is,
r-is the inner radius of the thimble, unit mm;
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
after expansion, the radial stress of the insert ring is
In the formula (9), the reaction mixture is,
P c radial stress of the ring after expansion, in MPa;
α - -diameter of the round bar conductor in mm;
R i0.2 - -thimble yield strength in MPa;
to meet the conductive current-carrying capacity of the interface in the semi-arc groove, the meshing yield area of the interface material in the semi-arc groove must be larger than the sectional area of the round rod binding post, the formula (9) is put into the formula (7), and the lowest axial pretightening force of each wedge is obtained as follows:
F min ≥2krπlR i0.2 (μcosβ+sinβ) (10)
in the formula (10), the compound represented by the formula (10),
k- -safety factor, 1.5;
α - - - -round bar conductor diameter in mm;
R i0.2 - -thimble yield strength in MPa;
mu- - - -coefficient of friction of the pattern drawing surface.
2. The coaxial round bar conductor wedge self-locker of claim 1 wherein: each wedge (4) is penetrated along the length direction of the wedge (4) by an assembly screw (5) and is fastened on the inner end side surface of the pattern drawing groove (14) on the hoop (1).
3. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 1, wherein: the middle part of the upper side of the hoop (1) is transversely provided with a U-shaped notch (7).
4. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 3, wherein: and a positioning set screw (11) is adopted to position between the middle part of the pressure plate (2) and the hoop (1).
5. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 1, wherein: the radial stress that staple bolt and clamp plate circular arc section need when crimping wedge locking:
in the formula (1), the acid-base catalyst,
P cmax radial stress of the hoop and the circular arc section of the pressing plate in unit MPa;
R i0.2 the yield strength of the insert ring in MPa.
6. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 5, wherein: the minimum wall thickness required by the hoop and the circular arc section of the pressing plate is as follows:
in the formula (2), the reaction mixture is,
P cmax radial stress of the hoop and the circular arc section of the pressing plate in unit MPa;
D i -the inner diameter of the circular arc segment in mm;
δ cmin calculating the wall thickness in unit mm by using the anchor ear and the circular arc section of the pressing plate;
R c0.2 the hoop and the press plate have yield strength in Mpa.
7. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 1, wherein: upper limit axial pretightening force F of each wedge max ：
The hoop compression beam shear stress cannot be greater than 0.5 times of the hoop material yield strength, then:
in the formula (14), l represents the length of the embedded ring in mm;
R c0.2 -hoop and platen material yield strength in MPa;
t is the actual minimum thickness of the hoop in unit mm;
n- - -hoop drawing die face pressure, unit Newton;
beta- - -wedge draft angle, unit degree;
bringing formula (11) into formula (7)
In the formula (12), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
R c0.2 -hoop and platen material yield strength in MPa;
t is the actual minimum thickness of the hoop in unit mm;
beta-wedge draft angle, unit degree.
8. The construction method of the coaxial round bar conductor wedge self-locker as claimed in claim 1, wherein: drawing angle when the wedge is self-locked:
assuming that the wedge is self-locked and stopped in the anchor ear after stopping expansion, the wedge is acted by four forces, namely the pressure N of the inner end side surface of the die drawing groove, the friction force f of the inner end side surface of the die drawing groove and the pressure N of the die drawing surface of the pressure plate i The friction force f of the die drawing surface of the pressing plate i The radial strain of each part caused by the expansion pressure is not changed, i.e. the pressure N i Without change, i.e.
f＝μN (13)
f i ＝μN i (14)
N i sinβ+Nsinβ＝f i cosβ+fcosβ (15)
In formula (14)
Mu- - - -drawing surface friction coefficient;
N i -the pressure of the die drawing surface of the press plate in newtons;
f i -the friction of the drawing surface of the press plate in newtons;
because the pressure of the two drawing die surfaces of the wedge is equal, the wedge is required to be self-locked in the connected anchor ear after the expansion is stopped, and the critical condition is that
tgβ≤μ。
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795365A (en) * | 1987-06-18 | 1989-01-03 | Amp Incorporated | Cable/wire splice device |
| CN101047284A (en) * | 2002-06-06 | 2007-10-03 | Fci公司 | Automatic electrical wedge connector |
| CN106099429A (en) * | 2016-05-02 | 2016-11-09 | 胡小青 | High-tension electricity gold utensil for power circuit |
| CN111009747A (en) * | 2019-07-29 | 2020-04-14 | 桂林市节清科技有限公司 | Annormal wire clip |
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2020
- 2020-12-29 CN CN202011602300.9A patent/CN113054452B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4795365A (en) * | 1987-06-18 | 1989-01-03 | Amp Incorporated | Cable/wire splice device |
| CN101047284A (en) * | 2002-06-06 | 2007-10-03 | Fci公司 | Automatic electrical wedge connector |
| CN106099429A (en) * | 2016-05-02 | 2016-11-09 | 胡小青 | High-tension electricity gold utensil for power circuit |
| CN111009747A (en) * | 2019-07-29 | 2020-04-14 | 桂林市节清科技有限公司 | Annormal wire clip |
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