CN102367123B - Anti-explosion elevator control cabinet - Google Patents
Anti-explosion elevator control cabinet Download PDFInfo
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- CN102367123B CN102367123B CN201110348594.1A CN201110348594A CN102367123B CN 102367123 B CN102367123 B CN 102367123B CN 201110348594 A CN201110348594 A CN 201110348594A CN 102367123 B CN102367123 B CN 102367123B
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- Elevator Control (AREA)
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Abstract
The invention relates to the technical field of anti-explosion control cabinet structure design and geometric modeling, in particular to an anti-explosion elevator control cabinet. The anti-explosion elevator control cabinet comprises a main cavity and a wiring cavity and is characterized in that the main cavity is in a spatial open cub structure formed by five steel plates; a closed cube space is formed at one surface with an opening through the connection between a flange and a box cover; the main cavity and the wiring cavity are separated by a sealed baffle; the main cavity box body and the box cover are connected by connecting bolts; the wall thickness of the main cavity box body is more than 16mm; and the space between the connecting bolts is 40-180mm. The anti-explosion elevator control cabinet has excellent anti-explosion function, the cost performance is obviously improved as compared with that of the prior art, and a brand-new thought is provided for design of the anti-explosion control cabinet.
Description
[technical field]
The present invention relates to explosion proof control case structure-design technique field, geometrical Modeling Technology field, specifically a kind of anti-explosion elevator control cabinet.
[background technology]
In the process run, there is the ignition source may lighting explosive gas mixture in electric and mainly contain: electrically spark, electrostatic spark, arc spark, bunch discharge etc. in explosion-proof lift system.As the electric wiring such as various relay, contactless switch, safety switch (limit switch, limit switch, emergency stop switch, mode switch etc.), hall buttons, electrical junction box, distribution box without protectors, ground connection, connecting to neutral device may cause these sparks, form ignition source.
Control housing is the control axis of elevator, inside has the multiple electric wirings such as control relay, contactless switch, voltage transformer, counting machine, PLC, anti-explosion safety grid, connection terminal.Collect in cabinet among the control housing being entered elevator from the various signal instructions of elevator hoistways, machine room, car by each cable.Control housing defines the various operation programs of elevator, determine the mode of operation of elevator, service direction, Signal aspects, the function control housing explosion-proof performances such as circuit protection must meet GB3836.1, the standards such as GB3836.2 and GB3836.4, shell protection should be not less than IP44 grade, insulation resistance, dielectric strength should meet the regulation of GB1497 " low-voltage electrical apparatus basic standard ", seal ring introducing device should meet the 21st article of sealing property and requirement of mechanical strength in GB3836.2 standard, seal ring and pad should to adopt between shore hardness 45 ~ 55 degree and through the qualified rubber of ageing test, between connection box (chamber) interior live parts and and metal case between electric clearance should be greater than 8mm, creep distance is not less than 10mm, connection box (chamber) internal wiring should be installed firmly, terminal can bear the attaching parts torsion test requirement of in GB3836.1 the 23rd article, connection box (chamber) inwall and main cavity inner wall should be coated with are-tight paint, interior external ground and ground connection label must be had, interior earth stud is not less than M6, external ground bolt is not less than M8, earth stud should do antirust treatment, on housing, should there be Ex label at obvious position, the caution notice board such as nameplate and " power-off is uncapped behind source ".
Flame proof and intrinsic safety are the explosion proof control case forms that two classes are the most general.Flame-proof type product is a kind of anti-explosion product of intensity type, often be applicable to the explosion-proof of strong power system, its shell can bear the flammable mixtures penetrating into enclosure by any face of joint of shell or structure interval and not damage at internal explosion, and can not cause lighting of the outside explosive atmosphere formed by a kind of, multiple gases or steam.Essential safe type product is a kind of anti-explosion product of energy security type, is often applicable to the explosion-proof of weak electricity system, and any spark that its circuit produces under the normal fault condition worked and specify or calorific effect all can not light the explosive gas atmosphere of regulation.Flame proof technology and intrinsic safety combine with technique are the communities that two kinds of explosion-proof forms are had complementary advantages on identical product, adopt flame proof and the explosion-proof lift of intrinsic safety compound type, have stronger operability at the scene, use flexible, easy to maintenance and with low cost.
Flame-proof type explosion-proof control housing housing can adopt casting or with Plate Welding, generally be divided into main chamber and connection box (chamber).Main chamber to be divided into again (or left and right) two main chamber up and down by some explosion proof control case when designing, respectively there is a connection box in each main chamber, the weak electrical appliance such as associated circuit and PLC of intrinsically safe circuit can be put in a main chamber, and the forceful electric power electrical equipment such as voltage transformer, relay, contactless switch can be put in another main chamber.So the main ignition source of elevator electrical circuit is general all inside main chamber.Cable, when entering anti-explosion terminal box (chamber), should adopt flame proof sealed type, and namely the cross section of cable is circular, and protecting jacket surface and flame retardant rubber seal ring do not have, convex-concave, the defect such as aging, guarantee explosion prevention function.Explosion-proof casing surface should not static electricity gathered; flawless; mechanical is out of shape; its flame proof connects table top gap should meet technical requirements (being generally 0.1 ~ 0.2mm); flame proof connects table top can not corrosion; rust preventing must be had, plating, coating thin-layer rust-preventative oil protection (as displaced type 204-1 type non-drying anti-corrosion oil) forbidding paint or butter and so on.Because flame proof connects the corrosion of table top or coating paint all flame proof is connect table top gap smaller or resistance is dead, be difficult to ensure explosion insulation performance.
This case explosion-proof technology is the safest most failure-free explosion-proof technology occurred in the last few years, and its explosion-proof principle is the energy of limiting circuit, and the electric current and voltage product that circuit electrical is produced can not be lighted the comb. miscellaneous gas of surrounding and ignite.Take intrinsic safety type measures for the prevention of explosion, can make explosion-proof control loop safely, succinctly, reliably.
Because the control housing casing (as placed the main chamber casing of weak control circuit) taking intrinsic safety type measures for the prevention of explosion does not need special explosion-proof fail-safe structure, therefore there is no structural essential distinction with Common Controller casing.The research of this report mainly (does not such as adopt the main chamber of intrinsic safety type measures for the prevention of explosion for the control housing body structure of flame-proof type, or the main chamber of the control housing that placed forceful electric power electrical equipment), because the body structure of flame-proof type control housing just must to get up good explosion-proof effect through special Explosion-proof Design.
Although basic function and the structural shape of the flame-proof type control housing of explosion-proof lift are fairly simple, due to the difference of each manufacturers design feature, there is very large difference in the concrete structure that there is flame-proof type control housing in the market.This report with certain money typical explosion-proof lift flame-proof type control housing for research object, set up the finite element model of control housing main chamber casing, the strength and stiffness feature of research flameproof cabinet under maximum explosion pressure, inquire into the impact for box body explosion-proof performance such as size, structure and material of casing, to finding out, wherein there is regular thing, for design, the selection of flame-proof type explosion-proof control box, and the formulation of associated specifications provides technical support.
[summary of the invention]
The object of the invention is to solve the deficiencies in the prior art, in selection, control housing function and structure do concrete test and restriction, thus the optimal technical solution of design explosion proof control case structure and selection, provide a kind of and meet explosion-proof, essential safety, anti-explosion elevator control cabinet rational in infrastructure simultaneously.
Can be drawn a conclusion through overtesting: (1) can be found out, the stress maxim in three directions all occurs in the threaded connection place of case lid and box flange.(2) gap of main chamber Width face of joint appear at adjacent two be threaded between, and maxim appears at the place of the mid point close to width, and maxim is about 0.014mm.(3) maximum stress value of main chamber casing under explosion pressure reduces with the increase of main chamber tank thickness value, tank thickness required for different materials is different, need to obtain according to yield limit and casing stress curve, concrete data are shown in specific embodiment.
According to test the data obtained, and solve a kind of control housing for explosion-proof lift of the deficiencies in the prior art design, comprise main chamber and wire connection cavity, it is characterized in that the space openings cube structure that described main chamber is made up of five block plates, and in the one side of opening by the connection of flange and case lid, form a closed cubic space, opened by the baffle for separating closed between main chamber and wire connection cavity, main chamber casing and case lid adopt tie bolt to be connected, the wall thickness of described main chamber casing is greater than 16mm, and described tie bolt spacing is between 40mm ~ 180mm.
Described main chamber casing steel plate materials adopts ZL104 aluminum alloy materials to make, and the wall thickness of main chamber casing is greater than 21mm.
Described main chamber casing steel plate materials adopts the high ZL201 aluminum alloy materials of yield limit to make, and the wall thickness of main chamber casing is greater than 14mm.
Described main chamber casing adopts carbon structural steel Q235 to make, and the wall thickness of main chamber casing is greater than 16mm.
Described main chamber casing adopts low quenching degree case-hardening steel 20Cr to make, and the wall thickness of main chamber casing is greater than 10mm.
The maximum stress value of described casing under explosion pressure reduces with the increase of main chamber tank thickness value; The maximum face of joint gap width of casing under explosion pressure increases with the reduction of main chamber case lid one-tenth-value thickness 1/10.
The present invention compared with the existing technology, according to strict computing machine Geometric Modeling, and by simulated explosion situation, finally design technical scheme and the structure of complete set, control housing is enable to have outstanding explosion prevention function, different materials is tested, to reach optimum thickness, its cost performance is promoted greatly.Can say, these data need complicated calculating and simulation, and the foundation of model and simplification need to get rid of many factors, pay performing creative labour, and the design for explosion proof control case provides a kind of brand-new thinking.
[accompanying drawing explanation]
Fig. 1 is general explosion-proof lift control housing body structure;
Fig. 2 is the A-A section-drawing of Fig. 1;
Fig. 3 is key point and the face of explosion-proof lift control housing main chamber casing model;
Fig. 4 is the geometric model of explosion-proof lift control housing main chamber casing;
Fig. 5 is the finite element model of explosion-proof lift control housing;
Fig. 6 is the realization that the main chamber of control housing is threaded in ANSYS software;
Fig. 7 is main chamber explosion pressure mode chart;
Fig. 8 is that X is to displacement deformation cloud atlas (unit: m);
Fig. 9 is that X is to rotational deformation cloud atlas (unit: rad);
Figure 10 is Y-direction displacement deformation cloud atlas (unit: m);
Figure 11 is Y-direction rotational deformation cloud atlas (unit: rad);
Figure 12 is Z-direction displacement deformation cloud atlas (unit: m);
Figure 13 is Z-direction rotational deformation cloud atlas (unit: rad);
Figure 14 is the resultant displacement Aberration nephogram (unit: m) of each node;
Figure 15 is the synthesis rotational deformation cloud atlas (unit: rad) of each node;
The deformation pattern of Figure 16 control housing main chamber casing;
Figure 17 is that X is to element stress cloud atlas; (unit: Pa);
Figure 18 is Y-direction element stress cloud atlas (unit: Pa);
Figure 19 is Z-direction element stress cloud atlas (unit: Pa);
Figure 20 is unit resultant stress cloud atlas (unit: Pa);
Figure 21 is another unit resultant stress cloud atlas (unit: Pa);
Figure 22 is the gap along control housing Width face of joint;
Figure 23 is along the gap of control housing short transverse face of joint;
The relation of Figure 24 main chamber tank thickness and maximum stress;
Figure 25 case lid thickness is for the impact in face of joint gap;
Figure 26 main chamber tank material (steel) is for the impact of control housing explosion-proof performance;
Figure 27 main chamber tank material (cast aluminium) is for the impact of control housing explosion-proof performance;
The relation in Figure 28 tie bolt spacing and face of joint gap;
[detailed description of the invention]
The present invention will be further described by reference to the accompanying drawings:
Explosion-proof lift with the schematic diagram of control housing casing and formal parameter as shown in Figure 1.Wherein, whole casing is divided into main chamber and wire connection cavity two large divisions.Owing to being opened by the baffle for separating closed between main chamber and connection box (chamber), this two parts space is also relatively independent in use at ordinary times, get absolute volume comparatively large, there is the main chamber of potential ignition source as research object, set up the finite element model of main cavity segment casing, study the explosion-proof performance of main cavity segment peer link and structural strength.
The design parameter of the main cavity segment of control housing is as follows: main chamber inner cavity size (mm): 365 × 600 × 822; Casing steel plate thickness (mm): 16; Box flange thickness (mm): 20; Box flange width (mm): 50; Case lid steel plate thickness (mm): 20; Casing, case lid and flange material: Q235; The yield limit (MPa) of casing, case lid and flange: 235; Attachment bolt specification: M12 × 40; Attachment bolt width between centers (mm): 60.
Set up geometric model: the main chamber of explosion-proof lift control housing casing in general, is the space openings cube structure be made up of five block plates, and in the one side of opening by the connection of flange and cylinder cap, finally form a closed cubic space.Using each angle point of main chamber casing as key point during Geometric Modeling, and the concrete size in the main chamber of control housing according to Fig. 1 determines that the coordinate of these key points is as shown in table 1.Adopt if undefined cartesian coordinate system: X is to the horizontal direction for screen place plane herein, Y-direction is the vertical direction of screen place plane, and Z-direction is the direction of normal to screen place plane.By once coordinate points as the key point of modeling:
| KeyPoint | X | Y | Z |
| 1 | 0.000 | 0.000 | 0.000 |
| 2 | 0.000 | 0.000 | 0.361 |
| 3 | 0.000 | 0.838 | 0.000 |
| 4 | 0.000 | 0.838 | 0.361 |
| 5 | 0.616 | 0.838 | 0.000 |
| 6 | 0.616 | 0.838 | 0.361 |
| KeyPoint | X | Y | Z |
| 7 | 0.616 | 0.000 | 0.000 |
| 8 | 0.616 | 0.000 | 0.361 |
| 9 | -0.042 | 0.000 | 0.561 |
| 10 | -0.042 | 0.880 | 0.561 |
| 11 | 0.658 | 0.880 | 0.561 |
| 12 | 0.658 | 0.000 | 0.561 |
| 13 | -0.042 | 0.000 | 0.361 |
| 14 | 0.000 | 0.050 | 0.361 |
| 15 | 0.000 | 0.880 | 0.361 |
| 16 | -0.042 | 0.880 | 0.361 |
| 17 | 0.658 | 0.880 | 0.361 |
| 18 | 0.616 | 0.880 | 0.361 |
| 19 | 0.616 | 0.050 | 0.361 |
| 20 | 0.658 | 0.000 | 0.361 |
The particular location of these 20 key points as shown in Figure 3.Wherein key point 9,10,11 and 12 is the points defined for generating main chamber case lid, and all the other key points are the point that generation main chamber casing and flange define.Also define six faces of main chamber casing in Fig. 2, represent with A1 ~ A6.Wherein A1 represents the face at case lid place, and A2 ~ A6 represents all the other except the opening surface connected with case lid of main chamber casing five faces.
According to the key point coordinate in upper table and Fig. 3 and position, the geometric model of explosion-proof lift control housing main chamber casing can be set up as shown in Figure 4.It should be noted that: (1), for the ease of distinguishing, main chamber casing and case lid are by modeling respectively in figure 3, and connecting flange and casing are integrally considered; (2) this report gives tacit consent to all thread connection and adopts standardized component, and is reliably tightened by according to relevant regulations, therefore under the prerequisite ensureing enough accuracy, in order to avoid whole model is too complicated, does not comprise the model of thread connection in Fig. 4.About the coupling effect of the stress brought because of thread connection and distortion, realize in the process of the finite element modeling in lower joint; (3) suppose that the face of joint of case lid and box flange is completely smooth, face of joint is reliably tight, ignores any face of joint gap caused because of the out-of-flat on surface.
The foundation of finite element model: although want large compared with the wall thickness of conventional lift control housing due to the wall thickness of anti-explosion elevator control cabinet main chamber casing, but still much smaller than the overall dimensions of control housing.Therefore, when setting up the finite element model of control housing in ANSYS, select shell unit to carry out modeling.So both avoided the significantly increase of the computing time of causing due to too much element number in solid modelling, in turn ensure that result of calculation had enough precision.
Because control housing main chamber casing is primarily of existing certain elastomeric steel plate composition, there is the feature such as large sstrain, large deformation.Therefore, when building the finite element model of control housing main chamber casing, select Shell93 housing unit.This housing unit is 8 node shell, is particularly useful for simulating bending housing.Each node six-freedom degree: x, y, z tri-directions and around x, y, z-axis three turns to.The all directions distortion planar of this housing unit is all secondary, and has plasticity, stress reinforced, large deformation, the features such as torsion capacity.
Meanwhile, consider the material of control housing main chamber casing, in finite element analysis, use following physical constant: elastic modulus E=206GPa, Poisson's ratio μ=0.3.
Set up the finite element model of elevator control cabinet model and result after grid division as shown in Figure 5.Wherein, 72737 nodes and 24037 unit are comprised altogether.
Due in the middle of the control housing casing of reality, linked together by screw bolt and nut between casing and case lid.In order to realize this relation be threaded in finite element model, proceed as follows in ANSYS:
(1) according to the concrete size in the drawing of control housing main chamber and position, the threaded connection place defined node in Fig. 5 casing finite element model.The node of case lid and flange threaded connection place is defined respectively.
(2) select the node on the actual case lid forming threaded connection relation and the node on flange, set up the coupled relation between these two nodes, by the six-freedom degree (x of these two nodes, y, z tri-directions and around x, y, z-axis three turns to) be associated together.
The main chamber of final control housing is threaded in and realizes effect as shown in Figure 6 in ANSYS, namely replaces being threaded in the middle of reality with the coupled relation between node.There are several groups between casing with case lid in the middle of actual drawing to be threaded, in model, just need several groups of switching nodes.In this way, can avoid setting up the too complicated model that is threaded, reduce modeling and the computational effort of model widely, and too much influence is not had for research purpose herein and research effect.
In addition, it should be noted that, because establish the coupled relation (being threaded) of the special joint between box flange with case lid in finite element model, therefore the absolute location in the calculation between casing and case lid recedes into the background, i.e. result of calculation the position relationship do not relied between casing and case lid.Therefore, in order to the convenience of modeling, also in order to make modeling and result of calculation more clearly show, casing and case lid are opened certain distance when modeling, as shown in Figure 5 and Figure 6.
Constraint and load: because the main chamber of control housing is a component part of control housing casing, and whole control housing casing be generally be placed in ground.Therefore, when carrying out finite element analysis to it, adopt following constraint to apply mode: the displacement of four angle points (key point) below bundle control housing, and will not retrain for the rotary freedom in other three directions.Concrete restraint condition is as shown in the table.
| KeyPoint | X to | Y-direction | Z-direction | X is to rotation | Y-direction rotates | Z-direction rotates |
| 1 | ● | ● | ● | ○ | ○ | ○ |
| 2 | ● | ● | ● | ○ | ○ | ○ |
| 7 | ● | ● | ● | ○ | ○ | ○ |
| 8 | ● | ● | ● | ○ | ○ | ○ |
(note: ● be Constrained, zero is not constraint)
Because blast is carried out in inside, control housing main chamber, and the impact of explosion pressure on control housing casing and each surface of case lid is identical substantially.Therefore, when carrying out finite element analysis, the load put on control housing casing and case lid should be pressure, direction be from control housing to control housing, and identical with the pressure size that case lid is subject on the surface at six casings.
When carrying out the explosion-proof test in the main chamber of control housing again according to GB3836.2-2000 " explosive gas atmosphere lift facility part 2: flame-proof type " d " ", recording dynamic test explosion pressure maxim is 0.72MPa.(as shown in Figure 7) therefore, in this report, using this value as concrete applied load value, the research of control housing main chamber explosion-proof performance is carried out.
Solve explosion time bulk deformation problem: because the casing in the main chamber of controller is made up of elastomeric steel plate, when being subject to blast impulse, elastomeric distortion can be produced.The finite element model of the controller main chamber casing that utilization is set up in joint, can calculate under maximum explosion pressure (0.72MPa) effect, the Aberration nephogram of each node under six-freedom degree is as shown in Fig. 8 ~ Figure 13, as shown in figure 14, the deformation pattern of main chamber casing as shown in figure 11 for the synthesis Aberration nephogram of node.
Fig. 8, Fig. 9 are each column joints deformation result relevant to X-axis, wherein Fig. 8 be along X to displacement, Fig. 9) be rotation around X-axis.As can be seen from Figure 8, X appears near tank floor (A2) place in main chamber casing two sides (A4 and A6) to the maxim of displacement, appears at first half center and the lower part center of main chamber tank floor (A2) and cylinder cap (A1) around X to the maximum angle rotated.
Figure 10, Figure 11 are each column joints deformation result relevant to Y-axis, and wherein Figure 10 is the displacement along Y-direction, and Figure 11 is the rotation around Y-axis.As can be seen from Figure 8, the maxim of Y-direction displacement appears at the center in casing upper and lower surfaces, main chamber (A3 and A5), and the maximum angle rotated around Y-direction appears at center, left side and the right-hand part center of main chamber tank floor (A2) and cylinder cap (A1).
Figure 12, Figure 13 are each column joints deformation result relevant to Z axis, and wherein Figure 12 is the displacement along Z-direction, and Figure 13 is the rotation around Z axis.As can be seen from Figure 12,13, the maxim of Z-direction displacement appears at the center of main chamber tank floor (A2) and cylinder cap (A1), and the maximum angle rotated around Z-direction appears at center, left side and the right-hand part center in casing upper and lower surfaces, main chamber (A3 and A5).
Comparison diagram 8 ~ Figure 13 is known, and the distortion maxim of Z-direction is much larger than X to the maxim of being out of shape with Y-direction, and this is mainly due to reason that the area in former and later two faces of casing, main chamber (A1 and A2) is large compared with other four faces.Equally, show that the node rotation in these two faces is also larger.
Figure 14, Figure 15 are the synthesis cloud atlas with each column joints deformation, and wherein Figure 14 is resultant displacement cloud atlas, and Figure 15 is synthesis rotation cloud atlas.As can be seen from Figure 14,15, the maxim (3.617mm) of nodal displacement appears at the center in main chamber tank floor (A2), and the maximum angle (0.0174rad) that node rotates appears at center, left side and the right-hand part center in main chamber tank floor (A2).In addition, the column joints deformation of the upper relevant position of cylinder cap (A1) and node rotate also larger.
Figure 16 is the deformation pattern of controller main chamber casing, wherein main chamber tank floor (A2) and cylinder cap (A1) convex, all the other four face indents slightly.
Stress analysis: the finite element model utilizing the controller main chamber casing set up, calculate under maximum explosion pressure (0.72MPa) effect, the Stress Map of each unit is as shown in Figure 17 ~ Figure 21.
Figure 17,18,19 is the Stress Map of control housing main chamber casing finite element unit in all directions, wherein Figure 17 be X to element stress, Figure 18 is the element stress of Y-direction, and Figure 19 is the element stress of Z-direction.Can find out, the stress maxim in three directions all occurs in the threaded connection place of case lid and box flange.In addition, X to the seamed edge place that joins with tank floor (A2) of larger stress value two sides (A4 and A6) mainly occurring in the center of main chamber tank floor (A2) and cylinder cap (A1) and casing; The larger stress value of Y-direction mainly occurs in the seamed edge place that the center of main chamber tank floor (A2) and cylinder cap (A1) and two sides (A3 and A5) of casing join with tank floor (A2); Four seamed edge places that four sides (A3, A4, A5 and A6) that the maximum stress value of Z-direction mainly occurs in casing join with tank floor (A2).
Figure 20,21 is the unit resultant stress cloud atlas obtained according to fourth strength theory.Can find out, the maxim of stress and higher value all occur in the threaded connection place of case lid and box flange, and maximum stress value is 1.61GPa.It should be noted that why there will be so large local stress, mainly during modeling, thread contact is reduced to the result of node coupling, there will not be in the middle of reality.And as can be seen from Figure 13, the sphere of action very little (being about as much as the sphere of action be threaded) of the large stress in local, and stress reduces fast in outside diffusion process.Therefore, giving tacit consent in the intensity failure-free situation be threaded, this simplification can not cause too much influence to the result of calculation of other parts.
Except threaded connection place, other larger stress mainly occurs in four seamed edge places that the center of main chamber tank floor (A2) and cylinder cap (A1) and four sides (A3, A4, A5 and A6) of casing join with tank floor (A2).And stress maxim is wherein 234MPa, appear at the center (as Suo Shi Figure 17 ~ 19) in main chamber tank floor (A2).Query material handbook is known, and the control housing main chamber yield limit of tank material Q235 when thickness is less than or equal to 16mm is 235MPa.And carry out according to the design parameters of control housing main chamber casing the maximum stress that FEM (finite element) calculation obtains and only have 234MPa (except bolt junction), therefore design parameters is safe, can not cause the destruction of main chamber casing.
Face of joint gap selection: utilize the finite element model of controller main chamber casing set up, calculate under maximum explosion pressure (0.72MPa) effect, the gap of the face of joint between control housing main chamber case lid and box flange as shown in Figure 22 and Figure 23.Wherein, Figure 22 is the gap in the upper bond face along control housing main chamber Width, and Figure 23 is the gap of the right part face of joint along control housing main chamber short transverse.Because during modeling, whole main chamber casing is symmetrical structure, so main chamber lower engagement face should be identical with above-mentioned two figure respectively with the gap of left part face of joint.
As can be seen from Figure 22, the position be threaded, gap is zero, and this supposes consistent with us for the complete failure-free that is threaded.The gap of main chamber Width face of joint appear at adjacent two be threaded between, and maxim appears at the place of the mid point close to width, and maxim is about 0.014mm.As can be seen from Figure 23, the position be threaded, gap is zero.The gap of main chamber short transverse face of joint appear at adjacent two be threaded between, and maxim appears at the place of the mid point close to height, and maxim is about 0.0146mm.
The selection of main chamber tank thickness: according to elevator control cabinet parameter, the maximum stress value of control housing main chamber casing is 234MPa, is less than the yield limit of main chamber tank material.Such design has certain redundancy, although ensure that enough safetys, also result in the waste of material.This section attempts research control housing main chamber tank thickness for the interact relation of maximum stress, seeks the optimum value of main chamber tank thickness.
Change the thickness parameter (other conditions are constant) of main chamber casing in the casing finite element model of control housing main chamber, and calculating is re-started to the structure after changing, obtain the maximum stress value of main chamber casing, and this maxim is carried out record.Relation curve between final drafting control housing main chamber tank thickness and maximum stress as shown in figure 24.
In Figure 24, abscissa represents the thickness on each surface of casing, main chamber, and ordinate represents the maximum stress of main chamber tank surface under design explosion pressure.The solid line of band asterisk " * " represents the change curve of maximum stress value with main chamber tank thickness, and in figure, the dotted line of yield limit gives the yield limit in main chamber tank material (Q235).Can find out, under the control housing structure determined by the design parameters in 3.1 joints: the maximum stress value of (1) main chamber casing under explosion pressure reduces with the increase of main chamber tank thickness value; (2) only have when the wall thickness of main chamber casing is greater than 16mm, guarantee control housing main chamber casing has enough safetys.
(other conditions are constant to change the thickness parameter of main chamber case lid in control housing main chamber casing finite element model, do not consider strength factor), and calculating is re-started to the structure after changing, obtain the maxim in face of joint gap between main chamber case lid and box flange, and this maxim is carried out record.Relation curve between final drafting control housing main chamber case lid thickness and maximum face of joint gap as shown in figure 25.
In Figure 25, abscissa represents the variation in thickness of main chamber case lid, and ordinate represents the gap width of face of joint between control housing main chamber case lid and box flange under design explosion pressure.The solid line of band asterisk " * " represents the change curve of maximum clearance value with main chamber case lid thickness, the maximum clearance value that in figure, the dotted line of yield limit is the explosive-proof grade that GB3836.2 provides allows when being IIC level.Can find out, when not considering strength factor, under the control housing structure determined by the design parameters in 2.1 joints: the maximum face of joint gap width of (1) main chamber casing under explosion pressure increases with the reduction of main chamber case lid one-tenth-value thickness 1/10; (2) only have when the wall thickness of main chamber case lid is greater than 10mm, guarantee control housing main chamber casing has enough safetys.
The selection of main chamber tank material: because the mechanical property of material is different, therefore when different materials selected by control housing main chamber casing time, different explosion-proof performances can be shown.In the middle of general knowledge, we can think that the wall thickness of main chamber casing can suitably reduce in time selecting the higher steel of yield limit or the higher casting aluminium material of tensile strength as main chamber tank material in the nature of things perceptually.But what degree wall thickness reduces to just is difficult to hold.By the calculating of control housing main chamber casing finite element model, the quantitative relationship between main chamber tank material and wall thickness can be determined further.
Figure 26 illustrates in the control housing main chamber body structure of design parameters structure, the relation between main chamber casing steel plate materials and main chamber casing minimum thickness.Can find out, as selected Q235 as the main chamber casing of control housing, then the wall thickness of main chamber casing must be greater than the enough safetys of 16mm guarantee; If the 20Cr that selects yield limit higher is as the main chamber casing of control housing, then the minimum thickness of main chamber casing can be reduced to 10mm.From other aspect, if the wall thickness limiting control housing main chamber casing is 15mm, then the material that the yield limit of necessary Selection radio No. 25 steel or Q275 steel is higher.
Figure 27 illustrates in the control housing main chamber body structure of design parameters structure, the relation between main chamber casing steel plate materials and main chamber casing minimum thickness.Can find out, as selected ZL104 as the main chamber casing of control housing, then the wall thickness of main chamber casing must be greater than the enough safetys of 21mm guarantee; If the ZL201 that selects yield limit higher is as the main chamber casing of control housing, then the minimum thickness of main chamber casing can be reduced to 14mm.From other aspect, if the wall thickness limiting control housing main chamber casing is 15mm, then the casting aluminium material that the tensile strength of necessary Selection radio ZL201 or ZL204A is higher.
It should be noted that in addition, economy and the welding performance of material are not considered in the analysis of this section.Although select the better material of mechanical characteristics (as 20Cr or ZL204A etc.) greatly can alleviate the wall thickness of main chamber casing, reduce the weight of whole casing, but will far away higher than conventional material (as Q235 or ZL104) by the cost of these materials, and welding performance also declines to some extent.So for the selection in the main chamber of flame-proof type control housing, not only will consider also to want explosion-proof performance, also in conjunction with many factors such as costs, comprehensive consideration and selection will be carried out.
Flame-proof type control box main chamber case lid is all rely on bolt to be connected with general between box flange, connects propose detailed requirement in GB3836.2 standard for this bolt.When ensureing to be threaded tightness own and reliability, between adjacent two bolts, the length of spacing just may affect the size (namely the size of relative deformation occurs at face of joint place for case lid and flange) in the gap of face of joint after blasting between case lid and flange.
Figure 28 has showed in the control housing main chamber body structure of design parameters structure, the relation in tie bolt spacing and face of joint gap.This research calculates under maximum explosion pressure (0.72MPa), and the size in face of joint gap when tie bolt spacing changes between 40mm ~ 180mm, can find: the gap of face of joint increases along with the increase of tie bolt spacing.Therefore, if will ensure that main chamber has enough anti-explosion safety performances, the spacing of tie bolt must strictly limit, can not be excessive.
Finally obtain one to draw a conclusion
(1) material of control housing casing, tank thickness, case lid thickness and tie bolt spacing etc. all likely have an impact for the Strength and Dformation of control housing under explosion pressure, are specially: the maximum stress value of casing under explosion pressure reduces with the increase of main chamber tank thickness value; The maximum face of joint gap width of casing under explosion pressure increases with the reduction of main chamber case lid one-tenth-value thickness 1/10; When selecting yield strength or the higher material of tensile strength, under same structure and explosion pressure, the thickness of casing can be reduced; The gap of case lid and box flange face of joint increases along with the increase of tie bolt spacing.
(2) for ensureing that flame-proof type control housing has enough anti-explosion safety performances, suitable material need be selected according to mechanical characteristics, economy, weldability etc., and according to concrete structure situation, limit minimum tank thickness, case lid thickness and tie bolt spacing.
According to above step, finally produce anti-explosion elevator control cabinet.
Claims (1)
1. utilize finite element modeling to establish a method for anti-explosion elevator control cabinet parameter, described anti-explosion elevator control cabinet comprises main chamber and wire connection cavity, it is characterized in that said method comprising the steps of:
A. geometric model is set up, the space openings cube structure that described main chamber is made up of five block plates, and in the one side of opening by the connection of flange and case lid, form a closed cubic space, opened by the baffle for separating closed between main chamber and wire connection cavity, main chamber casing and case lid adopt tie bolt to be connected, owing to being opened by the baffle for separating closed between main chamber and wire connection cavity, this two parts space is also relatively independent in use at ordinary times, get absolute volume larger, there is the main chamber of potential ignition source as research object, using each angle point of main chamber casing as key point during Geometric Modeling, comprise and generate main chamber case lid and the point that defines, generate main chamber casing and flange and the point defined, six faces of main chamber casing, the coordinate of these key points is determined according to the concrete size in the main chamber of control housing, adopt cartesian coordinate system: X to the horizontal direction for screen place plane, Y-direction is the vertical direction of screen place plane, Z-direction is the direction of normal to screen place plane, according to above-mentioned key point coordinate and position, set up the geometric model of explosion-proof lift control housing main chamber casing, set up the finite element model of main cavity segment casing,
B. finite element model is set up, when setting up the finite element model of control housing in ANSYS, select housing unit to carry out modeling, described housing unit is 8 node shell, each node six-freedom degree, i.e. x, y, z tri-directions and around x, y, z-axis three turns to, and all directions distortion planar of this housing unit is all secondary; Finite element analysis Elastic Modulus E=206GPa, Poisson's ratio μ=0.3, sets up the finite element model of elevator control cabinet model and after grid division, comprises 72737 nodes and 24037 unit altogether;
Owing to being be connected by screw bolt and nut between casing with case lid, in order to realize threaded connection relation in finite element model, proceed as follows in ANSYS:
(1) according to the concrete size in the drawing of control housing main chamber and position, the threaded connection place defined node in casing finite element model, the node of case lid and flange threaded connection place is defined respectively;
(2) select the node on the actual case lid forming threaded connection relation and the node on flange, set up the coupled relation between these two nodes, by the x of these two nodes, y, z tri-directions and around x, y, z-axis three turns to six-freedom degree, is associated together;
(3) the final main chamber of control housing is threaded in and realizes effect in ANSYS, namely replaces being threaded in the middle of reality with the coupled relation between node;
C. constraint and load, due to the component part that the main chamber of control housing is control housing casing, and whole control housing casing be generally be placed in ground, therefore, when carrying out finite element analysis to it, adopt following constraint to apply mode: the displacement of four angle points and key point below bundle control housing, and will not retrain for the rotary freedom in other three directions; Concrete restraint condition is as shown in the table:
(note: ● be Constrained, zero is not constraint)
Because blast is carried out in inside, control housing main chamber, and the impact of explosion pressure on control housing casing and each surface of case lid is identical substantially, therefore, when carrying out finite element analysis, the load put on control housing casing and case lid should be pressure, direction be from control housing to control housing, and identical with the pressure size that case lid is subject on the surface at six casings;
When carrying out the explosion-proof test in the main chamber of control housing again, recording dynamic test explosion pressure maxim is 0.72MPa, using this value as concrete applied load value, carries out the research of control housing main chamber explosion-proof performance;
D. explosion time bulk deformation problem is solved, because the casing in the main chamber of controller is made up of elastomeric steel plate, when being subject to blast impulse, elastomeric distortion can be produced, the finite element model of the controller main chamber casing that utilization is set up in joint, calculate under maximum explosion pressure 0.72MPa effect, obtain the deformation pattern of the Aberration nephogram of each node under six-freedom degree, the synthesis Aberration nephogram of node, main chamber casing;
E. stress analysis: the finite element model utilizing the controller main chamber casing set up, calculates under maximum explosion pressure 0.72MPa effect, the Stress Map of each unit;
F. face of joint gap selection: utilize the finite element model of controller main chamber casing set up, calculate under maximum explosion pressure 0.72MPa effect, the gap of the face of joint between control housing main chamber case lid and box flange, because during modeling, whole main chamber casing is symmetrical structure, so main chamber lower engagement face should be identical with the gap of right part face of joint with upper bond face respectively with the gap of left part face of joint; The position be threaded, gap is zero, the gap of main chamber Width face of joint appear at adjacent two be threaded between, and maxim appears at the place of the mid point close to width, and maxim is about 0.014mm;
G. the selection of main chamber tank thickness: according to elevator control cabinet parameter, the maximum stress value of control housing main chamber casing is 234MPa, be less than the yield limit of main chamber tank material, other conditions of thickness parameter changing main chamber casing in the casing finite element model of control housing main chamber are constant, and calculating is re-started to the structure after changing, obtain the maximum stress value of main chamber casing, and this maxim is carried out record, draw the relation curve between control housing main chamber tank thickness and maximum stress; Change the thickness parameter of main chamber case lid in the casing finite element model of control housing main chamber, other conditions are constant, do not consider strength factor, and calculating is re-started to the structure after changing, obtain the maxim in face of joint gap between main chamber case lid and box flange, and this maxim is carried out record, draw the relation curve between control housing main chamber case lid thickness and maximum face of joint gap;
H. the selection of main chamber tank material: because the mechanical property of material is different, therefore when different materials selected by control housing main chamber casing time, different explosion-proof performances can be shown;
Final acquisition parameter is as follows: the wall thickness of described main chamber casing is greater than 16mm, and described tie bolt spacing is between 40mm ~ 180mm; Described main chamber casing steel plate materials adopts ZL104 aluminum alloy materials to make, and the wall thickness of main chamber casing is greater than 21mm; Described main chamber casing steel plate materials adopts the high ZL201 aluminum alloy materials of yield limit to make, and the wall thickness of main chamber casing is greater than 14mm; Described main chamber casing adopts carbon structural steel Q235 to make, and the wall thickness of main chamber casing is greater than 16mm; Described main chamber casing adopts low quenching degree case-hardening steel 20Cr to make, and the wall thickness of main chamber casing is greater than 10mm, and the maximum stress value of described casing under explosion pressure reduces with the increase of main chamber tank thickness value; The maximum face of joint gap width of casing under explosion pressure increases with the reduction of main chamber case lid one-tenth-value thickness 1/10, and described steel plate materials, the wall thickness of main chamber casing, tie bolt spacing meet relation curve.
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| CN103140095B (en) * | 2013-01-25 | 2016-12-28 | 无锡瑞阳动力科技有限公司 | Mine anti-explosion electric control cabinet |
| DE102018118195B4 (en) * | 2018-07-27 | 2020-06-04 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing with split lid |
| CN109019714A (en) * | 2018-08-16 | 2018-12-18 | 天津亿利科能源科技发展股份有限公司 | A kind of modularization sewage treatment unit electric cabinet |
| CN110860690A (en) * | 2019-11-09 | 2020-03-06 | 上海航天设备制造总厂有限公司 | Electric explosion-proof system for metal additive manufacturing equipment and model selection method thereof |
| CN113613436B (en) * | 2021-08-09 | 2023-04-28 | 深蓝探索动力科技无锡有限公司 | Explosion-proof whole car controller |
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| CN201119136Y (en) * | 2007-11-14 | 2008-09-17 | 上海德圣米高电梯有限公司 | Explosion proof control case for elevator |
| CN201888034U (en) * | 2010-08-28 | 2011-06-29 | 东南电梯股份有限公司 | Explosion-proof control box for elevator |
| CN201928534U (en) * | 2010-11-25 | 2011-08-10 | 巨大矿业有限公司 | Flameproof shell |
| CN202414903U (en) * | 2011-11-07 | 2012-09-05 | 上海德圣米高电梯有限公司 | Explosion-proof elevator control cabinet |
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| CN201119136Y (en) * | 2007-11-14 | 2008-09-17 | 上海德圣米高电梯有限公司 | Explosion proof control case for elevator |
| CN201888034U (en) * | 2010-08-28 | 2011-06-29 | 东南电梯股份有限公司 | Explosion-proof control box for elevator |
| CN201928534U (en) * | 2010-11-25 | 2011-08-10 | 巨大矿业有限公司 | Flameproof shell |
| CN202414903U (en) * | 2011-11-07 | 2012-09-05 | 上海德圣米高电梯有限公司 | Explosion-proof elevator control cabinet |
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