CN112692745A - Lightning protection equipment bridging clamp and size design method thereof - Google Patents

Lightning protection equipment bridging clamp and size design method thereof Download PDF

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Publication number
CN112692745A
CN112692745A CN202010849931.4A CN202010849931A CN112692745A CN 112692745 A CN112692745 A CN 112692745A CN 202010849931 A CN202010849931 A CN 202010849931A CN 112692745 A CN112692745 A CN 112692745A
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Prior art keywords
clamp
bolt
clamp body
lightning protection
stress
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徐春明
马敏葡
钟海
廖强
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Shenzhen Kerui Technology Co ltd
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Shenzhen Kerui Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/10—Arrangements for positively actuating jaws using screws
    • B25B5/101—C-clamps

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Abstract

The invention relates to the technical field of bridging clamps, in particular to a lightning protection equipment bridging clamp and a size design method thereof, wherein the lightning protection equipment bridging clamp comprises a clamp body and a clamp bolt, the clamp body is provided with a mounting hole corresponding to the clamp bolt, the clamp body is of a U-shaped structure, and the inner edge of the U-shaped structure forms a clamping groove; the structure is simple, convenient and practical; a size design method for a lightning protection equipment bridging clamp is characterized in that the size of the clamp is designed according to the pressure requirement in a pipe, the stress and strain conditions of the clamp are analyzed by utilizing abaqus software, and the reliability of the clamp is accurately judged by comparing the yield strength of the clamp with the yield strength of a material of the clamp, so that the safety of personnel and equipment in use is effectively guaranteed.

Description

Lightning protection equipment bridging clamp and size design method thereof
Technical Field
The invention relates to the technical field of bridging clamps, in particular to a lightning protection equipment bridging clamp and a size design method thereof.
Background
The ground jumper is used for the purpose of conducting electric potential for the purpose of electrically assisting and connecting the disconnection between two electric pipelines and the sections of the bridge, and normally does not pass through current. The jumper wire is used at the joint of two bridge frames or the joint of two pipelines, and plays the role of leakage protection!
On high-voltage equipment (such as a natural gas pipeline), because the operation of the equipment can not be suspended, when the jumper wire is additionally installed by removing the screw cap, the two flanges need to be fixed by using a clamp, and the flange plate is tightly attached by virtue of the pretightening force of the bolts in the clamp, so that the leakage of the joint of the flange plate is prevented. In addition, in the high-voltage equipment in lightning protection work, a nut needs to be removed, a jumper wire needs to be installed, and a clamp needs to be used. Moreover, for the clamps connected with these high voltage devices, the bearing capacity of the clamps under high voltage needs to be calculated before use, so as to ensure the safety of personnel and equipment.
The existing clamp product cannot calculate the bolt pretightening force and stress analysis of the clamp and cannot ensure the safety of equipment and personnel.
Such as: the patent application number is CN201320440773.2, and discloses an electrical equipment high-voltage test fixture, which comprises a high-voltage end to be tested, a screw, a flexible conduit and a fixture, wherein the end part of the high-voltage end to be tested is fixedly provided with the screw, one end of the fixture is arranged on the screw, the other end of the fixture is connected with the flexible conduit, the fixture comprises a connecting pipe and a collet main body, the collet main body is cylindrical, the collet main body is coaxially sleeved on the screw on the high-voltage end to be tested, the middle part of the collet main body is radially and symmetrically provided with two elastic clamping pieces, a spring is respectively arranged between each elastic clamping piece and the collet main body, and the upper part of the collet main body is provided with; one end of the connecting pipe is provided with an internal thread matched with the external thread, and the other end of the connecting pipe is provided with a standard interface connected with the flexible conduit.
Disclosure of Invention
In order to solve the above problems, the present invention provides a lightning protection device bridging clamp and a size design method thereof, wherein the clamp has a simple structure and is convenient to produce and use.
The invention also aims to provide a lightning protection equipment bridging clamp and a size design method thereof, wherein different clamp sizes can be designed to be suitable for different pressure environments according to the pressure requirement in a pipeline; meanwhile, the pressure bearing capacity of the clamp can be calculated according to the size of the clamp; the safety is high.
In order to achieve the purpose, the invention adopts the technical scheme that:
a lightning protection equipment bridging clamp is characterized by comprising a clamp body and a clamp bolt, wherein the clamp body is provided with a mounting hole corresponding to the clamp bolt, the clamp body is of a U-shaped structure, a clamping groove is formed in the inner edge of the U-shaped structure, and the clamp bolt penetrates through the mounting hole and is matched with the clamping groove to clamp two flanges, so that the two flanges are tightly connected together;
the clamp bolt is provided with an external thread, the mounting hole is provided with an internal thread corresponding to the external thread, and the clamp bolt is in threaded connection with the mounting hole; the tightness degree of the clamp can be adjusted by rotating the clamp bolt.
Further, the clamp body and the clamp bolt are made of Q235 common carbon structural steel materials.
Further, the clamp body is provided with an inner round angle and an outer round angle.
A dimension design method of a lightning protection equipment bridging clamp comprises the following steps of designing the nominal diameter of a clamp bolt according to the pressure requirement in a pipe:
as is known, the pressure P in the pipe,
then F is equal to P.A1/Z
Wherein F is the axial working tension, A1The cross-sectional area of the pipeline is shown, and Z is the number of bolts;
Figure BDA0002644376320000021
wherein, Delta F is the tension increment, CbFor flange bolt stiffness, CmIs the stiffness of the connecting bolt;
Figure BDA0002644376320000022
f0 is clamp bolt pretightening force, T is bolt pretightening torque, and can be obtained by a bolt torque meter; d1Is a small diameter of the connecting bolt;
F1＝F0+ΔF-F
therefore, it is
Figure BDA0002644376320000023
Figure BDA0002644376320000024
Wherein the moment M1＝(FClamping device-F)·rMethod ofF1 is residual pretightening force, W is contact surface bending section coefficient, A2Is the contact surface area, [ sigma ] p]For allowable contact stress of contact surface, [ sigma ] p can be obtained by looking up table]To thereby solve for M1The size range of (a);
obtained by the method of M1 ═ F clamp-F r, F clamp the size range,
take FClamping deviceMaximum value of
Figure BDA0002644376320000025
Wherein s is1To a safety factor, σsThe yield strength of the material is 235 Mpa;
calculate d2Taking any of the values of d2The value of (d) is taken as the nominal clamp bolt diameter.
Further, the clamp body is subjected to stress analysis, the tensile stress sigma' borne by the n-n surface of the clamp body is calculated, then the height h of the bottom of the U-shaped structure is calculated, and the calculation formula is as follows:
Figure BDA0002644376320000031
wherein the content of the first and second substances,
Figure BDA0002644376320000032
Figure BDA0002644376320000033
i is the main moment of inertia,
Figure BDA0002644376320000034
so the maximum stress position sigma is sigma'тmax+σ’
From tensile Strength Condition σтmax≤[σ т]Wherein
Figure BDA0002644376320000035
The size range of h can be solved,
wherein b is the thickness of the clamp body, and the bending tensile stress and the compressive stress applied to the clamp are respectively sigma'T max andσ”cmax。
further, stress and strain analysis is carried out on the clamp body by combining the abaqus software with the dimensions of the clamp body and the clamp bolt, so that the stress borne by the clamp body is ensured to be smaller than the yield strength of the clamp body material, and the reliability of the clamp body is ensured.
The invention has the beneficial effects that:
the clamp comprises a clamp body and a clamp bolt, and is simple in structure and convenient to produce and use.
The invention can design different sizes according to different pressures in the pipe, analyzes the stress and strain conditions by utilizing abaqus software, and more accurately judges the reliability degree by comparing the yield strength of the material with the yield strength of the material, thereby more effectively ensuring the safety of personnel and equipment in use.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a side view of the present invention.
FIG. 4 is a schematic representation of a bolt torque chart for a flange specification of ANSI B16.5,300 grade.
FIG. 5 is a schematic representation of a bolt torque chart for a flange specification of ANSI B16.5,600 grade. Tensile stress of the clamp
FIG. 6 is a force analysis graph of the tensile stress experienced by the body of the inventive fixture.
FIG. 7 is a force analysis graph of the flexural tensile and compressive stresses experienced by the clamp body of the present invention.
Fig. 8-10 are schematic diagrams of stress and strain analysis performed by abaqus software for the present invention.
The reference numbers illustrate: 1. a clamp body; 2. the outside is round; 3. a clamp bolt; 4. the inner side is rounded; 5. and (7) installing holes.
Detailed Description
Referring to fig. 1-3, the lightning protection equipment jumper clamp of the present invention is characterized in that the lightning protection equipment jumper clamp includes a clamp body 1 and clamp bolts 3, the clamp body 1 is provided with mounting holes 5 corresponding to the clamp bolts 3, the clamp body 1 is a U-shaped structure, the inner edge of the U-shaped structure forms a clamping groove, and the clamp bolts 3 pass through the mounting holes 5 and cooperate with the clamping groove to clamp two flanges, so that the two flanges are tightly connected together;
the clamp bolt 3 is provided with an external thread, the mounting hole 5 is provided with an internal thread corresponding to the external thread, and the clamp bolt 3 is in threaded connection with the mounting hole 5; the tightness degree of the clamp can be adjusted by rotating the clamp bolt 3.
Further, the clamp body 1 and the clamp bolt 3 are both made of Q235 common carbon structural steel materials.
Further, the clamp body 1 is provided with an inner round corner 4 and an outer round corner 2; the purpose of this definition is that the rounded design avoids inadvertent scratching of the hand during use.
A dimension design method of a lightning protection equipment bridging clamp comprises the following steps of designing the nominal diameter of a clamp bolt 3 according to the pressure requirement in a pipe:
as is known, the pressure P in the pipe,
then F is equal to P.A1/Z
Wherein F is the axial working tension, A1The cross-sectional area of the pipeline is shown, and Z is the number of bolts;
Figure BDA0002644376320000041
wherein, Delta F is the tension increment, CbFor flange bolt stiffness, CmIs the stiffness of the connecting bolt;
Figure BDA0002644376320000042
f0 is the pretightening force of the clamp bolt 3, T is the bolt pretightening torque, and can be obtained by a bolt torque meter; d1Is a small diameter of the connecting bolt;
F1＝F0+ΔF-F
therefore, it is
Figure BDA0002644376320000043
Figure BDA0002644376320000044
Wherein the moment M1＝(FClamping device-F)·rMethod ofF1 is residual pretightening force, W is contact surface bending section coefficient, A2Is the contact surface area, [ sigma ] p]For allowable contact stress of contact surface, [ sigma ] p can be obtained by looking up table]To thereby solve for M1The size range of (a);
obtained by the method of M1 ═ F clamp-F r, F clamp the size range,
take FClamping deviceMaximum value of
Figure BDA0002644376320000051
Wherein s is1To a safety factor, σsThe yield strength of the material is 235 Mpa;
calculate d2Taking any of the values of d2The value of (d) is taken as the nominal diameter of the clamp bolt 3.
Referring to fig. 6 to 7, a stress analysis is performed on the fixture body 1, where an X-axis is along a length direction of the fixture body 1, a Y-axis coordinate is a stress corresponding to any point in the length direction, a tensile stress σ' borne by an n-n surface of the fixture body 1 is calculated, and then a height h of the bottom of the U-shaped structure is calculated, and a calculation formula is as follows:
Figure BDA0002644376320000052
wherein the content of the first and second substances,
Figure BDA0002644376320000053
Figure BDA0002644376320000054
i is the main moment of inertia,
Figure BDA0002644376320000055
so the maximum stress position sigma is sigma'тmax+σ’
From tensile Strength Condition σтmax≤[σ т]Wherein
Figure BDA0002644376320000056
The size range of h can be solved,
wherein b is the thickness of the clamp body 1, and the bending tensile stress and the compressive stress applied to the clamp are respectively sigma'T max andσ”cmax。
further, stress and strain analysis is carried out on the clamp body 1 by using abaqus software in combination with the sizes of the clamp body 1 and the clamp bolt 3, so that the stress applied to the clamp body 1 is ensured to be smaller than the yield strength of the material of the clamp body 1, and the reliability of the clamp body is ensured.
The specific embodiment is as follows:
example 1
The pressure in the tube is 30kg, i.e. P is 3MPa
F＝P·A1/Z＝3*pi*(60/2)2/4＝2120N (3-1)
Wherein P is the pressure in the tube, A1Is a pipe crossSectional area, Z is the number of bolts.
Figure BDA0002644376320000061
Wherein, CbFor flange bolt stiffness, CmFor the tie bolt stiffness.
Figure BDA0002644376320000062
Wherein T is the bolt tightening torque, and the value of T can be found with reference to fig. 4; d1Is a small diameter of the connecting bolt.
F1＝F0+ΔF-F＝36721+1060-2120＝35661N (3-4)
Therefore, it is
Figure BDA0002644376320000063
Figure BDA0002644376320000064
Wherein the moment M1＝(FClamping device-F)·rMethod ofW is the bending-resistant section coefficient of the contact surface,
Figure BDA0002644376320000065
is the contact surface area, [ sigma ] p]Allowable contact stress for the contact surface, the table look-up shows that the allowable contact stress is 0.8
σs，σs215 Mpa. Resolution is 4.48 Nm<M1≤15.00N·m。
By M1＝(FClamping device-F)·rMethod ofTo obtain 2228N<FClamping device≤2481N。
Take FClamping device2481N, from
Figure BDA0002644376320000066
Wherein，s1Taking 3.0 for safety factor; sigmasThe yield strength of the material is 235 MPa.
From the formula (3-7), d2>6.5mm, take d2I.e. the nominal diameter of the clamp bolt 3 is 8 mm.
Wherein the content of the first and second substances,
Figure BDA0002644376320000067
wherein the content of the first and second substances,
Figure BDA0002644376320000068
Figure BDA0002644376320000069
i is the main moment of inertia,
Figure BDA00026443763200000610
so that the maximum force therein
Figure BDA00026443763200000611
From tensile Strength Condition σтmax≤[σ т]Wherein
Figure BDA0002644376320000071
S 22, get
h is more than or equal to 15.8mm, and h is 20 mm.
The data of the present embodiment is put into abaqus software for analysis, and the analysis results are shown in fig. 8-9, which shows that the maximum stress occurs at the inner round corner 4, which is about 21mpa, which is smaller than the yield strength (235mpa) of the material used in the present invention, and the safety margin is large, which ensures the reliability.
In this embodiment, Δ F is the increment of the tensile force; f is axial working tension, F0 is pretightening force, F1 is residual pretightening force, h is the height of the bottom of the U-shaped structure, and b is the thickness of the clamp body 1.
Example 2
The pressure in the tube is 90kg, i.e. P is 9MPa
F＝P·A1＇/Z＝9*pi*(60/2)2/4＝6360N (3-13)
Wherein P is the pressure in the tube, A1’Z is the number of bolts for the cross-sectional area of the pipe.
Figure BDA0002644376320000072
Wherein, CbFor flange bolt stiffness, CmFor the tie bolt stiffness.
Figure BDA0002644376320000073
Wherein T is the bolt pretension torque, the value of T can be found with reference to fig. 5; d1Is a small diameter of the connecting bolt.
F1＝F0+ΔF-F＝57004+3180-6360＝53824N (3-16)
Therefore, it is
Figure BDA0002644376320000074
Figure BDA0002644376320000075
Wherein the moment M1＝(FClamping device-F)·rMethod ofW is the bending-resistant section coefficient of the contact surface,
Figure BDA0002644376320000076
is the contact surface area, [ sigma ] p]Allowable contact stress for the contact surface, the table look-up shows that the allowable contact stress is 0.8
σs，σs215 Mpa. Solution obtained, 13.62 N.m<M1≤106.24N·m。
By M1＝(FClamping device-F)·rMethod of6548N to get<FClamping device≤7825N。
Take FClamping device7825N of
Figure BDA0002644376320000077
Wherein s is1Taking 2.0 for safety factor; sigmasThe yield strength of the material is 235 MPa.
From the formula (3-19), d2>9.21mm, take d212mm, i.e. the nominal diameter of the clamp bolt 3 is 12 mm.
Stress analysis of a fixture
Wherein the content of the first and second substances,
Figure BDA0002644376320000081
wherein the content of the first and second substances,
Figure BDA0002644376320000082
Figure BDA0002644376320000083
i is the main moment of inertia,
Figure BDA0002644376320000084
so that the maximum force therein
Figure BDA0002644376320000085
From tensile Strength Condition σтmax≤[σ т]Wherein
Figure BDA0002644376320000086
S 22, get
h is more than or equal to 30.54mm, and h is taken as 50 mm.
The data of the embodiment is put into abaqus software for analysis, the analysis result is shown in fig. 10, and it can be seen from the figure that the maximum stress occurs at the inner round corner 4, which is about 39mpa, which is smaller than the yield strength (235mpa) of the material used in the invention, and the safety margin is large, so that the reliability and the use safety of the material are greatly ensured.
In this embodiment, Δ F is the increment of the tensile force; f is axial working tension, F0 is pretightening force, F1 is residual pretightening force, h is the height of the bottom of the U-shaped structure, and b is the thickness of the clamp body 1.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims (6)

1. A lightning protection equipment bridging clamp is characterized by comprising a clamp body and a clamp bolt, wherein the clamp body is provided with a mounting hole corresponding to the clamp bolt, the clamp body is of a U-shaped structure, a clamping groove is formed in the inner edge of the U-shaped structure, and the clamp bolt penetrates through the mounting hole and is matched with the clamping groove to clamp two flanges, so that the two flanges are tightly connected together;
the clamp bolt is provided with an external thread, the mounting hole is provided with an internal thread corresponding to the external thread, and the clamp bolt is in threaded connection with the mounting hole; the tightness degree of the clamp can be adjusted by rotating the clamp bolt.
2. The lightning protection device jumper clamp of claim 1, wherein the clamp body and the clamp bolts are both made of Q235 plain carbon structural steel material.
3. The lightning protection device jumper clamp of claim 1, wherein the clamp body is provided with an inside fillet and an outside fillet.
4. The method for sizing a lightning protection device jumper clamp according to claim 3, wherein the nominal diameter of the clamp bolts is designed according to the pressure requirement inside the pipe, specifically as follows:
as is known, the pressure P in the pipe,
then F is equal to P.A1/Z
Wherein F is the axial working tension, A1The cross-sectional area of the pipeline is shown, and Z is the number of bolts;
Figure FDA0002644376310000011
wherein, Delta F is the tension increment, CbFor flange bolt stiffness, CmIs the stiffness of the connecting bolt;
Figure FDA0002644376310000012
f0 is clamp bolt pretightening force, T is bolt pretightening torque, and can be obtained by a bolt torque meter; d1Is a small diameter of the connecting bolt;
F1＝F0+ΔF-F
therefore, it is
Figure FDA0002644376310000013
Figure FDA0002644376310000014
Wherein the moment M1＝(FClamping device-F)·rMethod ofF1 is residual pretightening force, W is contact surface bending section coefficient, A2Is the contact surface area, [ sigma ] p]For allowable contact stress of contact surface, [ sigma ] p can be obtained by looking up table]To thereby solve for M1The size range of (a);
by M1＝(FClamping device-F)·rMethod ofTo obtain (F)Clamping deviceThe size range of (a) to (b),
take FClamping deviceMaximum value of
Figure FDA0002644376310000021
Wherein s is1To a safety factor, σsThe yield strength of the material is 235 Mpa;
calculate d2Taking any of the values of d2The value of (d) is taken as the nominal clamp bolt diameter.
5. The dimension design method of the lightning protection device bridging clamp according to claim 4, wherein the clamp body is subjected to stress analysis, the tensile stress σ' borne by the n-n surface of the clamp body is calculated, and then the height h of the bottom of the U-shaped structure is calculated, and the calculation formula is as follows:
Figure FDA0002644376310000022
wherein the content of the first and second substances,
Figure FDA0002644376310000023
Figure FDA0002644376310000024
i is the main moment of inertia,
Figure FDA0002644376310000025
so the maximum stress position sigma is sigma'тmax+σ’
From tensile Strength Condition σтmax≤[σт]Wherein
Figure FDA0002644376310000026
The size range of h can be solved,
wherein b is the thickness of the clamp body, and the bending tensile stress and the compressive stress applied to the clamp are respectively sigma'T max andσ”cmax。
6. the dimension design method of the lightning protection device bridging clamp according to claim 5, wherein the clamp body is subjected to stress and strain analysis by using abaqus software in combination with the dimensions of the clamp body and the clamp bolt, so that the stress applied to the clamp body is ensured to be smaller than the yield strength of the clamp body material, and the reliability of the clamp body is ensured.
CN202010849931.4A 2020-08-21 2020-08-21 Lightning protection equipment bridging clamp and size design method thereof Pending CN112692745A (en)

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Publication number Priority date Publication date Assignee Title
CN114084312A (en) * 2021-12-27 2022-02-25 中船澄西扬州船舶有限公司 Fixture tool for cargo tank cushion block of asphalt ship

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CN207415177U (en) * 2017-11-22 2018-05-29 天威保变（秦皇岛）变压器有限公司 A kind of transformer box edge clamping tool
CN109753686A (en) * 2018-12-04 2019-05-14 中国航空工业集团公司西安飞机设计研究所 A kind of concentration posting structure nail group's load distribution calculation method
CN109543360A (en) * 2019-01-18 2019-03-29 中国科学院金属研究所 A kind of finite element method for evaluating iron tower of power transmission line bolt strength
CN210608325U (en) * 2019-06-27 2020-05-22 金湖金诚电子科技有限公司 Electric motor car wiring harness flange crimping device

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Publication number Priority date Publication date Assignee Title
CN114084312A (en) * 2021-12-27 2022-02-25 中船澄西扬州船舶有限公司 Fixture tool for cargo tank cushion block of asphalt ship

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