CN110849709B - Supporting seat for simply supported beam bending test and simply supported beam bending test device - Google Patents
Supporting seat for simply supported beam bending test and simply supported beam bending test device Download PDFInfo
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- CN110849709B CN110849709B CN201911267653.5A CN201911267653A CN110849709B CN 110849709 B CN110849709 B CN 110849709B CN 201911267653 A CN201911267653 A CN 201911267653A CN 110849709 B CN110849709 B CN 110849709B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
Abstract
The invention relates to a supporting seat for a simply supported beam bending test and a simply supported beam bending test device, wherein the supporting seat for the simply supported beam bending test comprises a first supporting beam, a first bearing seat, a first bearing, a first rolling body and a first supporting plate, the second supporting seat comprises a second supporting beam, a track groove seat, a second bearing, a second rolling body and a second supporting plate, the track groove seat is provided with a track groove, the two second bearings are arranged in a rolling fit with the corresponding track groove, and gaps are formed between the first rolling body and the upper surface of the first supporting beam and between the second rolling body and the upper surface of the second supporting beam; still relate to simply supported beam flexural test device. The invention has the beneficial effects that: fix the rolling element together with the backup pad that corresponds, can not appear irregular slip and heeling at the upset in-process between rolling element and the backup pad like this, in order to satisfy experimental requirement simultaneously, design benefit, simple structure, it is very practical.
Description
Technical Field
The invention relates to a test device in the field of buildings, in particular to a support seat for a simply supported beam bending test and the simply supported beam bending test device.
Background
The simply supported beam bending test is one of important tests for testing the performance of a structural member, wherein deflection deformation is an indispensable index for evaluating the mechanical performance of the structural member, and usually displacement measurement equipment such as a displacement meter or a dial indicator is placed at the lower part of the structural member to acquire deflection deformation data in real time. The fatigue testing machine is the main equipment in the performance test of the simply supported beam, the fatigue testing machine generally comprises two upright posts which are fixed on a test bed and arranged in the transverse direction, a cross frame which is arranged on the upright posts, a hydraulic push rod is arranged in the middle of the cross frame, two supporting seats which are arranged on the test bed along the longitudinal direction, and a first supporting seat and a second supporting seat respectively, wherein the first supporting seat comprises a first I-shaped beam which is fixed on the test bed and arranged along the transverse direction, a first arc plate which is buckled on the upper surface of the first I-shaped beam along the transverse direction and has a semicircular section, and a first supporting plate which is arranged on the first arc plate, the second supporting seat is arranged in parallel with the first supporting seat and comprises a second I-shaped beam which is fixed on the test bed and arranged along the transverse direction, a steel cylinder which has a circular section on the upper surface of the second I-shaped beam along the transverse direction, and a second supporting plate which is arranged on the steel cylinder, the lap joint of simple beam is in the first backup pad and the second backup pad of two supporting seats, then the upper surface of operation hydraulic push rod roof pressure simple beam downwards, paste various sensors on the simple beam, the top at simple beam both ends and the below at simple beam middle part all are equipped with the displacement meter, but the displacement meter mainly includes the shell and locates the axially movable's in the shell measuring stick, the lower surface of simple beam is withstood to the upper end that is located the measuring stick of displacement meter of simple beam below, measure the deformation range of simple beam in the experimentation.
In the existing laboratory test process, the deviation of the measurement result of the simply supported beam in the same batch is large, the consistency of the practical application performance is not consistent, technicians are not thought to understand the results, and after a large amount of research and reason analysis, the technicians find out the reason in the test process, the first supporting plate and the second supporting plate are straight due to the fact that the first supporting plate and the second supporting plate are in contact with the lower arc surface, the first supporting plate and the second supporting plate are only placed on the arc surface, the test process is very unstable, the first supporting plate and the second supporting plate are downwards overturned around the corresponding arc surfaces respectively under the bending deformation effect of the simply supported beam, irregular sliding and tilting between the first supporting plate and the second supporting plate are easy to occur in the overturning process, even one end or two ends of the first supporting plate slide to correspond to the arc surfaces, and the problem of large deviation of the test result of the same simply supported beam is caused.
In addition, the damage of the simply supported beam is uncertain often, when a component with large weight is broken suddenly due to insufficient bearing capacity and falls, the displacement measuring equipment with high cost on the lower part of the component can be damaged, the price of the displacement meter is hundreds of thousands, the cost expenditure of a laboratory is greatly increased, and how to prevent the displacement meter from being broken when the simply supported beam is broken is a technical problem to be solved urgently.
Disclosure of Invention
The invention provides a supporting seat for a simply supported beam bending test, which aims to solve the problem that the test result of the simply supported beam of the prior art has larger deviation as the same worker, and also provides a simply supported beam bending test device.
The invention adopts the following technical scheme: the supporting seat for the simply supported beam bending test comprises a first supporting seat and a second supporting seat which are longitudinally distributed on a test bed, wherein the first supporting seat comprises a first supporting beam which is fixed on the test bed and arranged along the transverse direction, two first bearing seats which are fixedly arranged on the upper surfaces of two ends of the first supporting beam respectively, a first bearing which is fixedly arranged in the first bearing seat, two first rolling bodies which are arranged in the first bearing in a penetrating way along the transverse direction and a first supporting plate which is fixedly arranged on the first rolling bodies, the second supporting seat and the first supporting seat are arranged in parallel, the supporting seat comprises a second supporting beam which is fixedly arranged on the test bed along the transverse direction, two track groove seats which are fixedly arranged on the upper surfaces of two ends of the second supporting beam respectively, a second bearing, a second rolling body which is arranged in the penetrating way along the transverse direction in the two second bearing and a second supporting plate which is fixedly arranged on the second rolling body, the track groove seats are provided with track grooves which extend along the longitudinal direction, two the second bearing with correspond the track groove roll cooperation setting, all have the clearance between first rolling element and the first supporting beam upper surface and between second rolling element and the second supporting beam upper surface.
Preferably, the first support beam and the second support beam are both a transversely disposed longer i-beam or two transversely disposed shorter i-beams.
Preferably, the first rolling element comprises a cylinder or an arc-shaped plate with a circular, major-arc or semicircular cross section, two ends of the cylinder or the arc-shaped plate are fixed in the inner ring of the first bearing through the rotating shaft which is fixedly arranged, the second rolling element comprises a cylinder or an arc-shaped plate with a circular, major-arc or semicircular cross section, and two ends of the cylinder or the arc-shaped plate are fixed in the inner ring of the second bearing through the rotating shaft which is fixedly arranged.
The simply supported beam bending test device comprises a test bed, a fatigue testing machine arranged on the test bed and the support seat for the simply supported beam bending test according to any one of claims 1 to 3 arranged below the fatigue testing machine, wherein a plurality of grooves with convex cross sections extending along the longitudinal direction are transversely distributed on the test bed, fixing bolts are arranged in the grooves, the width of the groove openings of the grooves is smaller than that of the end parts of the lower ends of the bolts, and the first supporting beam and the second supporting beam are fixed on the test bed through the fixing bolts.
Preferably, still include the displacement meter protective cradle, the displacement meter protective cradle is located the fatigue testing machine below and is located between first supporting seat and the second supporting seat, including the support frame and locate the steel sheet on the support frame, the support frame includes along two channel-section steel girder steels of transverse distribution and sets firmly two at least bracing pieces on every channel-section steel girder steel, two the channel-section steel girder steel all extends along longitudinal direction, and the steel sheet sets firmly in the top of bracing piece, and the middle part of steel sheet has the through-hole that supplies the displacement meter to pass.
Preferably, the bracing piece has four, sets up two on being located four angles of steel sheet and every channel-section steel girder steel respectively the upper end welded fastening of every bracing piece is on the steel sheet, and the lower extreme welded fastening of every bracing piece is on the last pterygoid lamina that corresponds the channel-section steel girder steel.
Preferably, the bracing piece has four, is located four angles of steel sheet and sets up two on every channel-section steel girder steel respectively the bracing piece, the both ends of every bracing piece all set up the external screw thread, and the upper end of every bracing piece is inserted and is established on the steel sheet and establish soon through the nut of both sides about the steel sheet fixedly, and the lower extreme of every bracing piece is inserted and is established on the last pterygoid lamina that corresponds the channel-section steel girder steel and establish soon through the nut of both sides about the last pterygoid lamina fixedly, and the thread length of bracing piece lower extreme is longer than the vertical length of last pterygoid lamina through-hole.
Preferably, the device also comprises a displacement meter fixing mechanism, wherein the displacement meter fixing mechanism comprises two electromagnets, a power supply and a plurality of conducting wires, two electricity connection plates and the mount of connecting two electro-magnets, the electro-magnet has the plastic casing, two electricity of the coil of electro-magnet are connected the contact and are set up on the shell top surface, the electricity connection plate is including fixing the insulation board on iron plate lower surface and locating two on the insulation board be used for with correspond the electric connection contact piece of being connected, the electric magnet is drawn forth through the wire to electricity connection contact piece, a power supply, wire and electricity connection plate form a series circuit, the mount is including fixing the connecting rod on two electro-magnet shells, the free end an organic whole of every connecting rod sets up C shape clamp, the free end of C shape clamp all has the edge of turning up, two C shape clamps form one be used for holding the staple bolt of displacement meter shell and pass through the staple bolt of turning up along the connection fixed be in the same place.
Preferably, two hanging baskets for receiving the electromagnet are further arranged below the iron plate, an annular connecting surface is arranged at the top of each hanging basket and fixed on the bottom surface of the iron plate through the connecting surface, and the insulating plate is arranged in the corresponding annular connecting surface.
The invention has the beneficial effects that: fix the rolling element together with the backup pad that corresponds, can not appear irregular slip and heeling in the upset in-process between rolling element and the backup pad like this, simultaneously in order to satisfy experimental requirement, but the experimental requirement of translation when one side only overturns the opposite side upset promptly, first rolling element realizes the upset through wearing to establish in the first bearing that is fixed in first bearing frame, and then drive the upset of first backup pad, the second rolling element is through wearing to establish and realize the upset setting in the second bearing, and then drive the upset of second backup pad, the track groove seat all has the track groove that extends along longitudinal direction simultaneously, two second bearings and the track groove roll cooperation that corresponds, when receiving longitudinal component, second backup pad and second rolling element are along longitudinal direction translation together, design benefit, moreover, the steam generator is simple in structure, and is very practical.
Furthermore, the first supporting beam and the second supporting beam in two forms can be selected according to requirements, and flexibility is improved.
Furthermore, first rolling element includes that the cross-section is circular, major arc or semicircular cylinder or arc, and both ends are pegged graft through the pivot that sets firmly and are fixed in the inner circle of first bearing, the second rolling element includes that the cross-section is circular, major arc or semicircular cylinder or arc, and both ends are pegged graft through the pivot that sets firmly and are fixed in the inner circle of second bearing, can set up in a flexible way.
Simple beam test device that bends, include the test bench, locate fatigue testing machine on the test bench and locate the fatigue testing machine below simple beam for bending test supporting seat, be in the same place the rolling element is fixed with the backup pad that corresponds, can not appear irregular slip and heeling at the upset in-process between rolling element and the backup pad like this, in order to satisfy experimental requirement simultaneously.
Furthermore, set up displacement meter protective cradle among the simple beam bending test device, the displacement meter is installed in the below of displacement meter protective cradle, move the meter protective cradle and fix the below at fatigue testing machine, the measuring stick of displacement meter passes the steel sheet through the perforation on the steel sheet, supports the simple beam and measures, when simple beam break, the measuring stick of displacement meter is back down and is retracted, the simple beam pounding is on protective cradle's steel sheet to avoid causing the damage to the displacement meter, simple and practical.
Furthermore, the two ends of the supporting rod are provided with external threads, the thread length of the lower end of the supporting rod is longer than the vertical length of the through hole of the upper wing plate, so that the height of the steel plate can be adjusted by adjusting the length of the telescopic rod below the upper wing plate, and the displacement meter protecting support can be suitable for simple beams with more heights.
Furthermore, for some use scenes, such as the situation that the height of the displacement meter protective bracket cannot be adjusted, or the adjusting capacity is limited, under the condition that the simple beam is too high, the displacement meter shell has to be extended upwards out of the iron plate together to meet the requirement that the measuring rod contacts the lower surface of the simple beam, in order to avoid the damage of the displacement meter when the simple beam is broken, the scheme skillfully designs a series circuit, the attraction force between the electromagnet and the iron plate is slightly larger than the sum of the gravity of the displacement meter fixing mechanism and the gravity of the displacement meter by adjusting the current, the thread of the displacement meter shell is still in the measuring process, the measuring precision is ensured, when the simple beam is broken and then is hammered to the top of the displacement meter shell, once the sum of the set maximum magnetic force is exceeded, namely the total attraction force is exceeded, the electric connection contact is separated from the electric connection contact piece, and once the magnetic force is separated, the magnetic force disappears instantly, the displacement meter fixing mechanism only bears the action of gravity, is similar to the free fall state, and the cracked simple beam can not continue to apply pressure to the displacement meter, and the displacement meter fixing mechanism drops on the test bench, and only the sponge needs to be laid, so that the displacement meter can be guaranteed to be intact and ingenious.
Furthermore, two hanging baskets for accommodating the electromagnet are arranged below the iron plate, the electromagnet hanging baskets directly fall into the hanging baskets after falling off, the displacement meter is further prevented from being damaged, and a buffer does not need to be laid on the test bed.
The simple beam bending test device well protects the displacement meter due to the arrangement of the displacement meter protection bracket with the structure, and property and time loss caused by damage of the displacement meter are saved.
Drawings
FIG. 1 is a schematic view of a transverse structure of a support seat for a simply supported beam bending test according to the present invention;
FIG. 2 is a schematic diagram of a left-side longitudinal structure of the support seat for a simply supported beam bending test according to the present invention;
FIG. 3 is a right side longitudinal structural diagram of the support seat for a simply supported beam bending test according to the present invention; (ii) a
FIG. 4 is an enlarged view of a portion of FIG. 1 at A;
FIG. 5 is an enlarged view of a portion of FIG. 1 at B;
FIG. 6 is a schematic diagram of a left longitudinal structure of the simply supported beam bending test device of the present invention;
FIG. 7 is a schematic structural view of a protective bracket of the displacement meter in FIG. 6;
FIG. 8 is an enlarged view of a portion of FIG. 7 at C;
FIG. 9 is a schematic top view of the electromagnet and the fixing frame;
FIG. 10 is a schematic view of a series circuit in a displacement meter protective bracket;
FIG. 11 is a schematic structural diagram of a basket in the protective bracket of the displacement meter of the present invention;
FIG. 12 is a schematic view of another embodiment of the protective bracket of the displacement meter of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of a support base for a simply supported beam bending test, as shown in fig. 1-6, comprises a first support base and a second support base longitudinally distributed on a test bed 1, wherein the first support base comprises a first support beam 3 fixed on the test bed and arranged along a transverse direction, two first bearing seats 8 fixedly arranged on the upper surfaces of two ends of the first support beam respectively, a first bearing 18 fixedly arranged in the first bearing seat, first rolling bodies 11 transversely arranged in two first bearing seats and a first support plate 10 fixedly arranged on the first rolling bodies, the second support base is arranged parallel to the first support base and comprises a second support beam 5 fixed on the test bed and arranged along the transverse direction, two track groove seats 13 fixedly arranged on the upper surfaces of two ends of the second support beam respectively, a second bearing 15, a second rolling body 16 transversely arranged in two second bearing seats and a second support plate 17 fixedly arranged on the second rolling bodies, the rail groove seats are provided with rail grooves 19 extending along the longitudinal direction, the two second bearings 15 are arranged in rolling fit with the corresponding rail grooves 19, and gaps are reserved between the first rolling bodies and the upper surface of the first supporting beam and between the second rolling bodies and the upper surface of the second supporting beam. The first supporting beam and the second supporting beam are both a transversely arranged longer I-shaped steel beam or two transversely arranged shorter I-shaped steel beams, in the embodiment, for the purpose of displaying the attached drawings more intuitively, the two shorter I-shaped steel beams are adopted, in use, the two I-shaped steel beams are fixed on a test bed through bolts 2, in other embodiments, the test bed is a steel test bed and can also be directly welded on the test bed, the test bed can also be embedded in the test bed if the test bed is of a concrete structure, the first rolling body 11 comprises a cylinder or an arc-shaped plate with a circular, major arc or semicircular cross section, two ends of the first rolling body are fixedly inserted into an inner ring of the first bearing 18 through a fixedly arranged rotating shaft 9, the second rolling body comprises a cylinder or an arc-shaped plate with a circular, major arc or semicircular cross section, two ends of the second rolling body are fixedly inserted into an inner ring of the second bearing 15 through a fixedly arranged rotating shaft, in the embodiment, the cylinder-shaped steel beam with a major arc cross section is adopted, the structure intensity is bigger like this, the test object scope is wider, the axial plane and the supporting beam welding of rolling element are in the same place, area of contact is bigger, the welding is firm, can prevent to have the clearance and lead to buckling deformation downwards when the rolling element atress because of the rolling element with correspond between the supporting beam, if the rolling element or the test object bearing of the bigger material of intensity is less the circumstances in other embodiments, can adopt drum or arc, first bearing seat 8 welds in the centre of first supporting beam tip, track groove seat 13 welds in the tip of second supporting beam, it needs to explain also can adopt bolted connection in other embodiments, first bearing and second bearing need to adopt the bearing that has bearing capacity, the preferred bearing that has column or toper rolling element.
The supporting seat of this embodiment is used for supporting the simply supported beam 4, in this embodiment, the rolling bodies are fixed with the corresponding supporting plates together, so that in the turning process of the supporting plates, irregular sliding and side tilting do not occur between the supporting plates and the rolling bodies, and meanwhile, in order to meet the test requirements that one side supporting plate is only turned over, and the other side supporting plate is also turned over while being translated, the first rolling bodies are turned over by penetrating through the first bearings fixed in the first bearing seats, so as to drive the first supporting plates to turn over, the second rolling bodies are turned over by penetrating through the second bearings, so as to drive the second supporting plate to turn over, and meanwhile, the rail groove seats are respectively provided with rail grooves extending along the longitudinal direction, the two second bearings are in rolling fit with the corresponding rail grooves, and in the test process, when the second supporting plate is subjected to a longitudinal component force, the second supporting plate and the second rolling bodies are translated along the longitudinal direction together, the design is ingenious, the structure is simple, and the device is very practical.
An embodiment of a simply supported beam bending test device is shown in fig. 1-12, and comprises a test bed 1, a fatigue testing machine 23 arranged on the test bed, and a supporting seat 22 arranged below the fatigue testing machine and used for a simply supported beam bending test in the embodiment, wherein the test bed is provided with a plurality of grooves 6 and 24 which are in a convex shape along the cross section extending along the longitudinal direction, fixing bolts 2 and 20 are arranged in the grooves, the width of the groove opening of each groove is smaller than that of the end part of the lower end of each bolt, a first supporting beam and a second supporting beam are fixed on the test bed through the fixing bolts 2, and the fatigue testing machine is the prior art and is not described in detail herein.
In order to prevent the displacement gauge from being broken by the broken simple-supported beam 4, the simple-supported beam bending test device further comprises a displacement gauge protection support 21, the displacement gauge protection support is located below the fatigue test machine and between the first support seat and the second support seat, the displacement gauge protection support comprises a support frame and a steel plate 32 arranged on the support frame, the support frame comprises two steel channel beams 25 and 57 which are transversely distributed and at least two support rods 30 and 41 which are fixedly arranged on each steel channel beam, the two steel channel beams extend along the longitudinal direction, the steel plate is fixedly arranged above the support rods, a through hole (not shown in the figure) for the displacement gauge to pass through is formed in the middle of the steel plate, in the embodiment, the four support rods 30 and 41 are respectively located at four corners of the steel plate, the two support rods are arranged on each steel channel beam and distributed along the longitudinal direction, and external threads 29 are arranged at the upper end and the lower end of each support rod, 34, the upper end of bracing piece is inserted and is established fixedly on the steel sheet and through the nut 31 that is located steel sheet upper and lower both sides, 33 soon, and the lower extreme of bracing piece is inserted and is established on the upper wing plate 27 of channel-section steel girder, 42 and establish fixedly through the nut 26 of upper wing plate upper and lower both sides, 28 soon, and in order to facilitate the height of adjusting the steel sheet, the thread length of bracing piece lower extreme is longer than the vertical length of upper wing plate through-hole, can adjust the bracing piece through screwing the nut of upper wing plate upper and lower both sides like this and rise or descend, and then reach the purpose of adjustment steel sheet height. Corresponding fixing bolts in the test bed penetrate through the lower wing plate of the channel steel girder and realize the fixation of the channel steel girder on the test bed through nuts.
In other embodiments, for example, as shown in fig. 12, there are four support rods 59 and 60 of the displacement meter protection bracket, the four support rods are respectively located at four corners of the steel plate, two support rods are arranged on each channel steel beam, the upper end of each support rod is welded and fixed on the bottom surface of the steel plate, and the lower end of each support rod is welded and fixed on the upper wing plate of the corresponding channel steel beam.
For some use scenes, for example, the height of the displacement meter protective bracket cannot be adjusted due to the self structure, or the vertical width of the steel beam of the channel steel is limited, so that the adjustment capability is limited, in the case that some simply-supported beams are too high, the displacement meter housing 37 has to be extended upwards out of the iron plate together to meet the requirement that the measuring rod 38 contacts the lower surface of the simply-supported beam 4, in this case, in order to avoid the displacement meter from being damaged when the simply-supported beam is broken, the scheme of the embodiment further comprises a displacement meter fixing mechanism arranged below the iron plate, the displacement meter fixing mechanism comprises two electromagnets 35, 40, a power supply 45, a plurality of conducting wires 43, two electric connecting plates 36, 39 and a fixing frame for connecting the two electromagnets, the electromagnets are provided with plastic housings, the plastic housings in the embodiment are cylindrical, two sets of electric connecting contacts 50, 51 of the coils of the two electromagnets penetrate through the top surfaces of the respective plastic housings and protrude out of the top surfaces, the electric connection plate comprises an insulation plate fixed on the lower surface of the iron plate and two electric connection contact plates arranged on the insulation plate and used for being connected with corresponding electric connection contacts, the electric connection contact plates are copper sheets 61 and 62 fixed on the lower surface of the insulation plate in a fitting mode, the insulation plate is a rubber plate and is adhered to the lower surface of the iron plate, screw holes can be formed in the iron plate in other embodiments, and the rubber plate is fixed on the iron plate through screws. The electric connection contact piece is led out through a lead 43, the lead is embedded into a rubber plate in the embodiment, the two electric connection plates are arranged in series through the lead 43, the electromagnets 35 and 40, the power supply 45, the lead 43 and the electric connection plates 36 and 39 form a series loop, the power supply can be a storage battery or can be a power supply obtained by rectifying and filtering commercial power, the fixing frame comprises connecting rods 47 and 49 fixed on two electromagnet shells, the free end of each connecting rod is integrally provided with C- shaped clamps 52 and 53, the free ends of the C-shaped clamps are respectively provided with outward turning edges 55 and 56, the two C-shaped clamps form a hoop for tightly holding the displacement meter shell 37 and are connected and fixed together through the outward turning edges through hoop bolts 54, the connecting rods and the C-shaped clamps can be aluminum products or plastic products, and can be hot-melted and inserted or bonded or integrally arranged with the electromagnet shells. Two hanging baskets 46 and 48 for bearing the electromagnet are also arranged below the iron plate, the top of the hanging basket is provided with an annular connecting surface 462, the connecting surface is connected with the net bag 461 through three or four lifting ropes or suspension arms 463, the hanging basket is fixed on the bottom surface of the iron plate through the connecting surface of the hanging basket, the insulating plate is arranged in the corresponding annular connecting surface, and the connecting surface can be bonded on the iron plate or fixed on the iron plate through screws.
The scheme skillfully designs a series circuit, the current adjusting method is various by adjusting the current, the method is the prior art, the simplest method is to increase or decrease the number of batteries or to serially connect a slide rheostat, the repeated description is omitted, so that the electromagnet generates electromagnetic force to attract with an iron plate, the total attraction force is slightly larger than the sum of the gravity of a displacement meter fixing mechanism and the gravity of the displacement meter by adjusting, for example, exceeds the gravity by 0.1-5 Newton (set according to requirements), the embodiment is set to be 0.2 Newton, when the circuit is installed, only an electric connecting contact of the electromagnet is required to contact with an electric connecting contact piece, the circuit forms a series circuit, the displacement meter fixing mechanism can be stably adsorbed on the iron plate, in the measuring process, the thread of a displacement meter shell is kept, the measuring precision is ensured, when a simple support beam is broken and then hits the top of the displacement meter shell, once the total attraction force generated by the maximum magnetic force set by the two electromagnetic magnets is exceeded, the electric connection contact head is separated from the electric connection contact piece, once the electric connection contact head is separated from the electric connection contact piece, the series circuit is disconnected, the magnetic force disappears instantly, the displacement meter fixing mechanism only bears the action of gravity, the state is similar to a free falling body state, the broken simply supported beam cannot continuously apply larger pressure to the displacement meter, then the simply supported beam is blocked by the iron plate, and the whole process displacement meter is small in stress and not easy to damage. In this embodiment, the iron plate below still is equipped with two hanging flower baskets that are used for accepting the electro-magnet, and the electro-magnet hanging flower basket drops in the direct hanging flower basket that falls, further prevents displacement meter damage, need not to lay the buffer on the test bench.
In other embodiments, a hanging basket is not arranged, the displacement meter fixing mechanism drops on the test bed, and the displacement meter can be ensured to be intact and skillful only by laying sponge.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. Simply support the roof beam and receive the supporting seat for the bending test, include along longitudinal distribution's first supporting seat and second supporting seat on the test bench, its characterized in that: the first supporting seat comprises a first supporting beam, two first bearing seats, a first bearing, two first rolling bodies and a first supporting plate, wherein the first supporting beam is fixed on the test bed and arranged along the transverse direction, the first bearing seats are respectively fixedly arranged on the upper surfaces of two ends of the first supporting beam, the first bearing seats are fixedly arranged in the first bearing seats, the first rolling bodies are arranged in the two first bearings in a penetrating mode along the transverse direction, the first supporting plate is fixedly arranged on the first rolling bodies, the second supporting seat and the first supporting seat are arranged in parallel, the second supporting seat comprises a second supporting beam, two track groove seats, a second bearing, a second rolling body and a second supporting plate, the second supporting beam is fixedly arranged on the second rolling bodies, the second supporting beam is fixedly arranged on the test bed and arranged along the transverse direction, the track groove seats are respectively provided with track grooves extending along the longitudinal direction, and the two second bearings are arranged in a rolling fit with the corresponding track grooves, gaps are reserved between the first rolling body and the upper surface of the first supporting beam and between the second rolling body and the upper surface of the second supporting beam, the test bed is of a concrete structure, and the first supporting seat and the second supporting seat are buried and fixed in the test bed.
2. The supporting seat for the simply supported beam bending test according to claim 1, wherein: first supporting beam and second supporting beam are the longer I-shaped steel beam of a horizontal setting or two shorter I-shaped steel beams of horizontal arrangement.
3. The supporting seat for the simply supported beam bending test according to claim 2, wherein: the first rolling element comprises a cylinder or an arc-shaped plate with a circular, major arc or a semicircle cross section, two ends of the cylinder or the arc-shaped plate are fixed in the inner ring of the first bearing through the rotating shaft which is fixedly arranged, the second rolling element comprises a cylinder or an arc-shaped plate with a circular, major arc or a semicircle cross section, and two ends of the cylinder or the arc-shaped plate are fixed in the inner ring of the second bearing through the rotating shaft which is fixedly arranged.
4. Simple beam flexural test device, its characterized in that: the support comprises a test bed, a fatigue testing machine arranged on the test bed and the support seat for the bending test of the simply supported beam as claimed in any one of claims 1 to 3 arranged below the fatigue testing machine, wherein a plurality of grooves with the cross sections extending along the longitudinal direction are distributed on the test bed along the transverse direction, fixing bolts are arranged in the grooves, the width of the groove openings is smaller than the width of the end parts of the lower ends of the bolts, a first support beam and a second support beam are fixed on the test bed through the fixing bolts, the support seat also comprises a displacement meter protection bracket and a displacement meter fixing mechanism, the displacement meter protection bracket is arranged below the fatigue testing machine and between the first support seat and the second support seat, the support frame comprises a support frame and steel plates arranged on the support frame, the support frame comprises two steel channel beams distributed along the transverse direction and at least two support rods fixedly arranged on each steel channel beam, and the two steel channel beams both extend along the longitudinal direction, the steel plate is fixedly arranged above the supporting rod, and the middle part of the steel plate is provided with a through hole for the displacement meter to pass through; the displacement meter fixing mechanism comprises two electromagnets, a power supply and a plurality of leads, two electricity connection plates and the mount of connecting two electro-magnets, the electro-magnet has the plastic casing, two electricity of the coil of electro-magnet are connected the contact and are set up on the shell top surface, the electricity connection plate is including fixing the insulation board on iron plate lower surface and locating two on the insulation board be used for with correspond the electric connection contact piece of being connected, the electric magnet is drawn forth through the wire to electricity connection contact piece, a power supply, wire and electricity connection plate form a series circuit, the mount is including fixing the connecting rod on two electro-magnet shells, the free end an organic whole of every connecting rod sets up C shape clamp, the free end of C shape clamp all has the edge of turning up, two C shape clamps form one be used for holding the staple bolt of displacement meter shell and pass through the staple bolt of turning up along the connection fixed be in the same place.
5. The simply supported beam bending test device of claim 4, wherein: the bracing piece has four, sets up two on being located four angles of steel sheet and every channel-section steel girder steel respectively the bracing piece, the upper end welded fastening of every bracing piece is on the steel sheet, and the lower extreme welded fastening of every bracing piece is on the last pterygoid lamina that corresponds the channel-section steel girder steel.
6. The simply supported beam bending test device of claim 4, wherein: the bracing piece has four, is located four angles of steel sheet and sets up two on every channel-section steel girder steel respectively the bracing piece, the both ends of every bracing piece all set up the external screw thread, and the upper end of every bracing piece is inserted and is established on the steel sheet and establish soon through the nut of both sides about the steel sheet fixedly, and the lower extreme of every bracing piece is inserted and is established on the last pterygoid lamina of corresponding channel-section steel girder steel and establish soon through the nut of both sides about the last pterygoid lamina fixedly, and the thread length of bracing piece lower extreme is longer than the vertical length of last pterygoid lamina through-hole.
7. The simply supported beam bending test device of claim 4, wherein: two hanging baskets for bearing the electromagnet are further arranged below the iron plate, an annular connecting surface is arranged at the top of each hanging basket and is fixed on the bottom surface of the iron plate through the connecting surface, and the insulating plate is arranged in the corresponding annular connecting surface.
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| CN113155382B (en) * | 2021-03-09 | 2023-09-12 | 江苏现代工程检测有限公司 | Portable bridge deflection detection device |
| CN115096533A (en) * | 2022-05-18 | 2022-09-23 | 成都理工大学 | System and method for testing seismic performance of shear wall component |
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