CN201455508U - Device for measuring arc pressure distribution and current density distribution - Google Patents

Abstract

The utility model provides a device for measuring arc pressure distribution and current density distribution, belonging to the technical field of arc test. The device comprises a motor, a localization frame, guide rails fixed on the localization frame, a slider installed on the guide rails, a welding torch position adjusting mechanism installed at the lower end of the slider, a platform surface arranged below the localization frame, a container arranged on the platform surface and anode plates and weighing sensors, wherein the anode plates and the weighing sensors are placed in the container. During measuring, the motor drives a screw to rotate and further drives the welding torch to move on the guide rails along the direction vertical to the insulating material. The arc force having effects on the two anode plates and the arc current value are collected, then the mathematical models of the arc force value and the arc pressure distribution on circular field as well as the arc current value and the arc current density distribution on circular field are established, then solving is carried out and finally the curve of arc pressure distribution on circular field and the curve of current density distribution on circular field are made. The utility model can simultaneously measure the microscopic arc pressure distribution and arc current density distribution and is simple to measure and concise in test steps.

Description

A kind of device of measuring arc pressure distribution and electric current distribution

Technical field

The utility model belongs to the electric arc technical field of measurement and test, is specifically related to a kind of device of measuring arc pressure distribution and electric current distribution.

Background technology

Electric arc is a gas conductor between two electrodes.Ablation pit according on methods such as high-speed camera and the SEM ESEM observation electrode surface shows that electric arc is rounded.Consider slowly motion from left to right evenly of electric arc, electric arc is subjected to external influence very little, for the electric arc of uniform-compression, can think that its cross section is a sub-circular.

Arc pressure is determining the surface configuration in molten bath, the distribution of arc current density has directly determined the distribution of arc heat current density, the mode that arc heat is transferred to weldment has been described in the distribution of arc heat current density, therefore the distribution influence of the distribution of arc pressure and arc current density geometry, the appearance of weld in molten bath, the cooling characteristics of welding point, and the quality of welding point in final decision.Describe arc pressure distribution and arc current density exactly and distribute, not only have important significance for theories, and have important and practical meanings for the control welding quality for the essence of understanding arc physics in depth.

Arc pressure distributes and arc current density distributes is the focus that people pay close attention to, and also is the difficult point of electric arc research.Be provided with according to the experiment test result such as electric current distribution boundary condition, therefore test arc current density by experiment and distribute and to provide necessary reliable basis for the electric arc simulation study electric arc.Research in the past mainly is the arc pressure of research macroscopic view, the measurement of current density, and it is few for the research of microcosmic arc pressure, electric current distribution, and do not have the device that not only energy measurement microcosmic arc pressure distributes but also the energy measurement arc current density distributes, therefore seek a kind of rational measuring method and a kind of convenient and practical measurement mechanism of invention has important practical significance.

The utility model content

The purpose of this utility model is to provide a kind of can measure device and the measuring method that the microcosmic arc pressure distributes and arc current density distributes simultaneously, and this measuring method and data are handled simple, have higher accuracy and confidence.

In order to realize above purpose, the utility model has been taked following technical scheme:

A kind of device of measuring arc pressure distribution and electric current distribution comprises motor, posting, be fixed on the guide rail on the posting, be installed on the posting and the leading screw that links to each other with motor, be installed in the sliding part on the guide rail, be installed in the welding torch position guiding mechanism of sliding part lower end, be arranged on the flat surface of posting below, be fixed on and play the support column that supports the posting effect between flat surface and the posting, be placed on the container on the flat surface, be placed on positive plate and LOAD CELLS in the container, and left current sensor, left side oscillograph, right current sensor, right oscillograph, left side AD modular converter, right AD modular converter, left side computer and right computer.Wherein: sliding part is connected on the leading screw, and sliding part can slide along guide rail under the drive of leading screw.Described positive plate comprises left positive plate and the right positive plate that is positioned at same plane, between left positive plate and right positive plate, be provided with insulating materials, between left positive plate and container, be provided with left LOAD CELLS, between right positive plate and container, be provided with right LOAD CELLS.Left side LOAD CELLS links to each other with left computer by left AD modular converter, and right LOAD CELLS links to each other with left computer by right AD modular converter.Be provided with cooling fluid in container, left positive plate and right positive plate all are immersed in the cooling fluid, and left positive plate links to each other with left current sensor, and left current sensor links to each other with left oscillograph; Right positive plate connects with right current sensor and links to each other, and right current sensor links to each other with right oscillograph; Welding gun is installed in the lower end of welding torch position guiding mechanism.

On left positive plate and right positive plate, have the groove of identical size, in groove, fill in the light block of density less than described cooling fluid density.

Described left current sensor and right current sensor are the current sensors of same model; Described left oscillograph and right oscillograph are the oscillographs of same model; The AD modular converter that described left AD modular converter and right AD modular converter are same model; Described left LOAD CELLS and right LOAD CELLS are the LOAD CELLSs of same model.

The thickness of described insulating materials is 50 microns～150 microns.

The measuring method of the utility model device:

1) the slow uniform rotation of driven by motor leading screw, welding gun is slowly moved along the direction of vertically insulated material on guide rail evenly from left to right, electric arc between welding gun and the positive plate also slowly moves along the direction of vertically insulated material evenly from left to right with welding gun, be subjected to that ectocine is little, its cross section of the uniform electric arc of pressurized is rounded, be designated as electric arc circle territory in the electric arc transverse cross-sectional area of positive plate upper surface.

2) collection that acts on arc force on the left positive plate is realized by left LOAD CELLS, left AD modular converter, left computer, and reads the arc force value from left computer, is designated as F ₁(x);

The collection that acts on arc force on the right positive plate realizes by right LOAD CELLS, right AD modular converter, right computer, and reads the arc force value from right computer, is designated as F (x);

Act on arc current on the left positive plate by left current sensor, collect, and read the arc current value, be designated as I from left oscillograph by left oscillograph ₁(x);

Act on arc current on the right positive plate by right current sensor, collect, and read the arc current value, be designated as I (x) from right oscillograph by right oscillograph.

3) when electric arc vertically passes through insulating materials, act on the arc force value F on the left and right positive plate _{1 (x)}, F _(x)With the arc current value I that flows through left and right positive plate _{1 (x)}, I _(x)All change with respect to the insulating materials position and change, and draw electric arc from beginning to right positive plate left surface to just entering the required time Δ t of right positive plate fully from variation tendency along with welding gun; The rotating speed of leading screw equals rotating speed of motor, draws electric Arc Motion speed V by the rotating speed of leading screw and helical pitch to be

$V=\frac{h_B\×n}{60}---\left(1\right)$

In the following formula:

h _BHelical pitch for leading screw;

N is a rotating speed of motor;

Therefore, electric arc radius R _mFor:

$R_m=\frac{V\×\mathrm{\Δt}}{2}---\left(2\right)$

In the following formula: V is an electric Arc Motion speed;

Δ t is that electric arc is from beginning to right positive plate left surface to just entering right positive plate required time fully;

Electric arc circle territory pressure distribution P when 4) setting up electric arc vertically by insulating materials according to the arc force value _(ρ)Mathematical Modeling, set up vertically electric arc circle territory electric current distribution J when the insulating materials of electric arc according to current value _(ρ)Mathematical Modeling.The suffered arc force value F of right positive plate _(x)Be the projected area of electric arc circle territory on right positive plate to arc pressure P _(ρ)Integration, flow through the current value I of right positive plate _(x)Be the projected area of electric arc circle territory on right positive plate to current density, J _(ρ)Integration, as shown in Figure 4, its expression formula is respectively:

$F_{\left(x\right)}=2{\∫}_0^{\arccos \frac{x}{R_m}}{\∫}_x^{R_m}{p}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}\·d_{\mathrm{\θ}}=2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{P}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(3\right)$

$I_{\left(x\right)}=2{\∫}_0^{\arccos \frac{x}{R_m}}{\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}\·d_{\mathrm{\θ}}=2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(4\right)$

In the following formula:

X is the vertically distance of electric arc circle center, territory and right positive plate left surface when the insulating materials of electric arc, 0≤X≤R _m

R _mBe the electric arc radius;

P _(ρ)Electric arc circle territory pressure distribution when vertically passing through insulating materials for electric arc;

J _(ρ)Electric arc circle territory electric current distribution when vertically passing through insulating materials for electric arc;

ρ is the distance of scope interior arbitrfary point in electric arc circle territory far from the center of circle;

In like manner, for the suffered arc force value F of left positive plate _{1 (x)}Be the projected area of electric arc circle territory on left positive plate to arc pressure P _(ρ)Integration, flow through the current value I of left positive plate _(x)Be the projected area of electric arc circle territory on left positive plate to current density, J _(ρ)Integration, as shown in Figure 5, its expression formula is respectively:

$F_{1\left(x\right)}=F_{\max }-2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{P}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(5\right)$

$I_{1\left(x\right)}=I_{\max }-2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(6\right)$

In the following formula:

X is the vertically distance of electric arc circle center, territory and left positive plate right flank when the insulating materials of electric arc,

0≤X≤R _m

R _mBe the electric arc radius;

P _(ρ)Electric arc circle territory pressure distribution when vertically passing through insulating materials for electric arc;

J _(ρ)Electric arc circle territory electric current distribution when vertically passing through insulating materials for electric arc;

ρ is the distance of scope interior arbitrfary point in electric arc circle territory far from the center of circle;

F _MaxArc force maximum for left computer gained;

I _MaxArc current maximum for left computer gained;

5) solving equation (3) (4) or (5) (6) obtain electric arc semicircular domain pressure P _(ρ)With electric arc semicircular domain current density, J _(ρ)Thereby, make electric arc semicircular domain pressure distribution curve and electric arc semicircular domain electric current distribution curve; According to the symmetry of circle, be symmetry axis with the circular diameter, make the whole round territory of electric arc whole round territory pressure distribution curve and electric arc electric current distribution curve, as Fig. 8, shown in Figure 9.

The utility model has been realized the microcosmic arc pressure distributed and has been measured when distributing with arc current density, and device makes simply, and succinct, the no loaded down with trivial details data processing of testing procedure has degree of precision and confidence level.

Description of drawings

Fig. 1 is that the utility model passes through insulating materials time test arc pressure distributes and arc current density location mode schematic diagram

Fig. 2 is the A-A cutaway view of the utility model device

Model when Fig. 3 is the utility model electric arc circular cross-section by insulating materials

Fig. 4 is the utility model variation with X when passing through insulating materials, and arc force value and arc pressure distribute and the graph of a relation of arc current value and arc current density distribution on the right positive plate

Fig. 5 is the utility model variation with X when passing through insulating materials, arc force value and arc pressure on the left positive plate

The graph of a relation that distribution and arc current value and arc current density distribute

Fig. 6 is the utility model tendency chart that the arc force value changes with X when passing through insulating materials

Fig. 7 is the utility model tendency chart that the arc current value changes with X when passing through insulating materials

Fig. 8 is the tendency chart that arc pressure distributes and changes with X

Fig. 9 is the tendency chart that arc current density distributes and changes with X

The specific embodiment

Below in conjunction with accompanying drawing specific operation process of the present utility model is described in detail:

As shown in Figure 1 and Figure 2, the utility model device comprises: motor 1, guide rail 2, leading screw 3, welding torch position guiding mechanism 5, left side positive plate 11, right positive plate 16, cooling device (comprising container 12, cooling fluid 25), measure arc force system (comprising left LOAD CELLS 24, right LOAD CELLS 26, light block 23, left AD modular converter 10, right AD modular converter 17, left computer 9, right computer 18), measure current system (comprising left current sensor 8, right current sensor 21, left oscillograph 7, right oscillograph 22).This anode is made up of left positive plate 11 that is positioned at same plane and right positive plate 16, and middle insulating materials 14 with 50 microns～150 micron thickness separates fully.Two positive plates all are immersed in the cooling fluid 25, have the groove of identical size simultaneously, fill in density and all contact with LOAD CELLS bottom light block 23, two positive plates of cooling fluid density.Left side positive plate is connected to left current sensor 8, and left current sensor 8 links to each other with left oscillograph 7; Right positive plate is connected to right current sensor 21, and right current sensor 21 links to each other with right oscillograph 22.Posting 6 acts on the flat surface 19 by support column 20, and leading screw 3 is installed on the posting 6, and motor 1 is connected with leading screw 3, and welding gun 15 is connected on the leading screw 3 by welding torch position guiding mechanism 5, sliding part 4.

The current sensor that described left current sensor 8 and right current sensor 21 are same model; The oscillograph that described left oscillograph 7 and right oscillograph 22 are same model; The AD modular converter that described left AD modular converter 10 and right AD modular converter 17 are same model; The LOAD CELLS that described left LOAD CELLS 24 and right LOAD CELLS 26 are same model.The thickness of insulating materials is 50 microns～150 microns.Too high and impaired for preventing positive plate Yin Wendu, the LOAD CELLS pressurized damages and improves the precision of experiment by pressure too greatly, adopts special cooling device.

The measuring method of the utility model device:

1) motor 1 drives leading screw 3 uniform rotation, and welding gun 13 is moved along the direction of vertically insulated material 14 on guide rail 2 evenly from left to right, and the electric arc 15 between welding gun 13 and the positive plate also moves along the direction of vertically insulated material 14 evenly from left to right with welding gun; Be subjected to that ectocine is little, its cross section of the uniform electric arc of pressurized is rounded, be designated as electric arc circle territory along the electric arc transverse cross-sectional area of positive plate upper surface direction.

2) collection that acts on arc force on the left positive plate is realized by left LOAD CELLS 24, left AD modular converter 10, left computer 9, and reads the arc force value from left computer, is designated as F ₁(x);

The collection that acts on arc force on the right positive plate realizes by right LOAD CELLS 26, right AD modular converter 17, right computer 18, and reads the arc force value from right computer, is designated as F (x);

Act on arc current on the left positive plate by left current sensor 8, collect, and read the arc current value, be designated as I from left oscillograph 7 by left oscillograph 7 ₁(x);

Act on arc current on the right positive plate by right current sensor 21, collect, and read the arc current value, be designated as I (x) from right oscillograph 22 by right oscillograph 22;

F ₁(x), I ₁(x) with F (x), I (x) in variable all be the x of usefulness, in fact between the two differ the narrow and small distance between positive plate, small in view of this distance, be not easy in the accompanying drawing reflect, so do not distinguished in the accompanying drawings, unification represents that with x for the ease of the statement accompanying drawing, x is taken as its opposite number when electric arc circle territory is centered close to right positive plate, be negative value, x gets its original value when electric arc circle territory is centered close to left positive plate, promptly still on the occasion of, as Fig. 6, shown in Figure 7.

3) when electric arc vertically passes through insulating materials 14, act on the arc force value F on the left and right positive plate _{1 (x)}, F _(x)With the arc current value I that flows through left and right positive plate _{1 (x)}, I _(x)All change with respect to the insulating materials position and change, and draw electric arc 15 from beginning to right positive plate 16 left surfaces to just entering the required time Δ t of right positive plate fully from variation tendency along with welding gun; The rotating speed of leading screw equals rotating speed of motor, draws electric Arc Motion speed V by the rotating speed of leading screw and helical pitch to be

$V=\frac{h_B\×n}{60}---\left(1\right)$

In the following formula:

h _BHelical pitch for leading screw;

N is a rotating speed of motor;

Therefore, electric arc radius R _mFor:

$R_m=\frac{V\×\mathrm{\Δt}}{2}---\left(2\right)$

In the following formula: V is an electric Arc Motion speed;

Δ t is that electric arc is from beginning to right positive plate left surface to just entering right positive plate required time fully;

Electric arc circle territory pressure distribution P when 4) setting up electric arc vertically by insulating materials according to the arc force value _(ρ)Mathematical Modeling, set up vertically electric arc circle territory electric current distribution J when the insulating materials of electric arc according to current value _(ρ)Mathematical Modeling.The suffered arc force value F of right positive plate _(x)Be the projected area of electric arc circle territory on right positive plate to arc pressure P _(ρ)Integration, flow through the current value I of right positive plate _(x)Be the projected area of electric arc circle territory on right positive plate to current density, J _(ρ)Integration, as shown in Figure 4, its expression formula is respectively:

$F_{\left(x\right)}=2{\∫}_0^{\arccos \frac{x}{R_m}}{\∫}_x^{R_m}{p}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}\·d_{\mathrm{\θ}}=2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{P}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(3\right)$

$I_{\left(x\right)}=2{\∫}_0^{\arccos \frac{x}{R_m}}{\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}\·d_{\mathrm{\θ}}=2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(4\right)$

In the following formula:

X is the vertically distance of electric arc circle center, territory and right positive plate left surface when the insulating materials of electric arc, 0≤X≤R _m

R _mBe the electric arc radius;

P _(ρ)Electric arc circle territory pressure distribution when vertically passing through insulating materials for electric arc;

J _(ρ)Electric arc circle territory electric current distribution when vertically passing through insulating materials for electric arc;

ρ is the distance of scope interior arbitrfary point in electric arc circle territory far from the center of circle;

In like manner, for the suffered arc force value F of left positive plate _{1 (x)}Be the projected area of electric arc circle territory on left positive plate to arc pressure P _(ρ)Integration, flow through the current value I of left positive plate _(x)Be the projected area of electric arc circle territory on left positive plate to current density, J _(ρ)Integration, as shown in Figure 5, its expression formula is respectively:

$F_{1\left(x\right)}=F_{\max }-2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{P}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(5\right)$

$I_{1\left(x\right)}=I_{\max }-2\arccos \left(\frac{x}{R_m}\right){\∫}_x^{R_m}{J}_{\left(\mathrm{\ρ}\right)}\·\mathrm{\ρ}\·d_{\mathrm{\ρ}}---\left(6\right)$

In the following formula:

X is the vertically distance of electric arc circle center, territory and left positive plate right flank when the insulating materials of electric arc,

0≤X≤R _m

R _mBe the electric arc radius;

P _(ρ)Electric arc circle territory pressure distribution when vertically passing through insulating materials for electric arc;

J _(ρ)Electric arc circle territory electric current distribution when vertically passing through insulating materials for electric arc;

ρ is the distance of scope interior arbitrfary point in electric arc circle territory far from the center of circle;

F _MaxBe the arc force maximum of left computer gained, as shown in Figure 6;

I _MaxBe the arc current maximum of left computer gained, as shown in Figure 7;

5) solving equation (3) (4) or (5) (6) obtain electric arc semicircular domain pressure P _(ρ)With electric arc semicircular domain current density, J _(ρ)Thereby, make electric arc semicircular domain pressure distribution curve and electric arc semicircular domain electric current distribution curve; According to the symmetry of circle, be symmetry axis with the circular diameter, make the whole round territory of electric arc whole round territory pressure distribution curve and electric arc electric current distribution curve, as Fig. 8, shown in Figure 9.

Run the measurement result that the cambered surface surface quality helps obtaining preferably, therefore reply race cambered surface is carried out necessary processing before experiment, removes oxide on surface etc., remakes formal experiment; The insulating materials that is used to isolate left and right positive plate is thin more more little to the measurement result influence, should small interval be arranged with right positive plate when insulating materials is close to left anode simultaneously, in order to avoid influence the suffered separately electric arc force measurement of two positive plates; The range of LOAD CELLS is little, and in order to prevent to damage LOAD CELLS by pressure because of positive plate is too heavy, therefore two positive plates all have the groove of identical size, fill in density less than the light block of cooling fluid density to offset the part weight of positive plate; Cooling-liquid level to be produced fluctuation in order preventing to test, the electric arc force measurement to be exerted an influence, on container, add cover; Arc force value, arc current value to two-plate are all repeatedly measured, and carry out check analysis, improve the accuracy of experiment; This tests selected motor, leading screw, guide rail precision prescribed height, motor can slowly at the uniform velocity be driven make welding gun slowly motion evenly on guide rail when leading screw rotates, thereby make also slowly motion evenly thereupon of electric arc, arc motion speed is at the uniform velocity slow more, and it is just more little that electric arc is subjected to external influence, the approaching more circle of electric arc cross section shapes; When electric arc is crossed insulating materials from left to right, flow through a left side, the arc force value of right positive plate, the arc current value all changes, promptly act on the arc force value on the left positive plate, current value descends, act on the arc force value on the right positive plate, the arc current value rises, when electric arc arrives right positive plate surface fully, left side positive plate arc force value, the arc current value all is zero, right positive plate arc force value, it is maximum that the arc current value all reaches, as accompanying drawing 6, shown in 7. the arc force value is comprising the arc pressure of being pointed out by above-mentioned model in the variation tendency of current value, the information that arc current density distributes.

Claims (4)

1. a device of measuring arc pressure distribution and electric current distribution is characterized in that: comprise motor (1), posting (6), be fixed on the guide rail (2) on the posting (6), be installed in the leading screw (3) that posting (6) is gone up and linked to each other with motor (1), be installed in the sliding part (4) on the guide rail (2), be installed in the welding torch position guiding mechanism (5) of sliding part (4) lower end, be arranged on the flat surface (19) of posting below, be fixed on and play the support column (20) that supports the posting effect between flat surface (19) and the posting (6), be placed on the container (12) on the flat surface, be placed on positive plate and LOAD CELLS in the container (12), and left current sensor (8), left side oscillograph (7), right current sensor (21), right oscillograph (22), left side AD modular converter (10), right AD modular converter (17), left side computer (9) and right computer (18); Wherein: sliding part (4) is connected on the leading screw (3), and sliding part (4) can slide along guide rail (2) under the drive of leading screw (3); Described positive plate comprises left positive plate (11) and right positive plate (16), between left positive plate (11) and right positive plate (16), be provided with insulating materials (14), between left positive plate (11) and container (12), be provided with left LOAD CELLS (24), between right positive plate (16) and container (12), be provided with right LOAD CELLS (26), left side LOAD CELLS (24) links to each other with left computer (9) by left AD modular converter (10), and right LOAD CELLS (26) links to each other with right computer (18) by right AD modular converter (17); Be provided with cooling fluid (25) in container (12), left positive plate (11) and right positive plate (16) all are immersed in the cooling fluid (25), and left positive plate (11) links to each other with left current sensor (8), and left current sensor (8) links to each other with left oscillograph (7); Right positive plate connects (16) and links to each other with right current sensor (21), and right current sensor (21) links to each other with right oscillograph (22); Welding gun is installed in the lower end of welding torch position guiding mechanism (5).

2. a kind of device of measuring arc pressure distribution and electric current distribution according to claim 1, it is characterized in that: on left positive plate (11) and right positive plate (16), have the groove of identical size, in groove, fill in the light block (23) of density less than described cooling fluid density.

3. a kind of device of measuring arc pressure distribution and electric current distribution according to claim 1, it is characterized in that: described left current sensor (8) is the current sensor of same model with right current sensor (21); Described left oscillograph (7) is the oscillograph of same model with right oscillograph (22); Described left AD modular converter (10) is the AD modular converter of same model with right AD modular converter (17); Described left LOAD CELLS (24) is the LOAD CELLS of same model with right LOAD CELLS (26).

4. a kind of device of measuring arc pressure distribution and electric current distribution according to claim 1, it is characterized in that: the thickness of described insulating materials is 50 microns～150 microns.

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