CN211317974U - Displacement gauge protection bracket and simply supported beam bending test device - Google Patents

Abstract

The utility model relates to a displacement meter protective cradle and simply supported roof beam flexural test device, wherein displacement meter protective cradle includes the support frame and locates the steel sheet on the support frame, the support frame includes along two channel-section steel girder steels of horizontal distribution and two at least bracing pieces of fixing on every channel-section steel girder steel, two the channel-section steel girder steels all extend along the longitudinal direction, the steel sheet sets firmly in the top of bracing piece, the middle part of steel sheet has the through-hole that supplies the displacement meter to pass; still include simply supported roof beam flexural test device. The utility model has the advantages that: when the displacement meter is used, the displacement meter is installed below the displacement meter protection support, the displacement meter protection support is fixed below the fatigue testing machine, the measuring rod of the displacement meter penetrates through a through hole in the steel plate to abut against the simple beam for measurement, when the simple beam breaks, the measuring rod of the displacement meter retracts downwards, the simple beam is smashed on the steel plate of the protection support, and therefore the displacement meter is prevented from being damaged, and the displacement meter is simple and practical.

Description

Displacement gauge protection bracket and simply supported beam bending test device

technical field

The utility model relates to a test device in the construction field, in particular to a displacement meter protection bracket and a simply supported beam bending test device.

Background technique

The simply supported beam bending test is one of the important methods to test the performance of structural members, in which deflection deformation is an indispensable index for evaluating the mechanical properties of the member. Usually, displacement measuring equipment such as displacement gauge or dial indicator is placed at the lower part of the member for deflection deformation. Real-time collection of data. The fatigue testing machine is the main equipment in the performance test of simply supported beams. The fatigue testing machine generally includes two vertical columns fixed on the test bench and arranged horizontally, a horizontal frame arranged on the vertical column, and a hydraulic push rod is set in the middle of the horizontal frame. Two support bases arranged in the longitudinal direction, during the test, the simply supported beam is overlapped on the two support bases, and then the hydraulic push rod is operated to press down the upper surface of the simply supported beam, and various sensors are pasted on the simply supported beam, and the displacement Designed under the simply supported beam, the displacement meter mainly includes a casing and an axially movable measuring rod set in the casing. The upper end of the measuring rod bears against the lower surface of the simply supported beam. Deformation magnitude. In the existing laboratory test process, there is often uncertainty in the damage of simply supported beams. When a heavy component suddenly breaks and falls due to insufficient bearing capacity, it will cause damage to the expensive displacement measuring equipment below it. The price is often hundreds to thousands, which greatly increases the cost of the laboratory. How to prevent the displacement meter from being smashed when the simply supported beam is broken is a technical problem that needs to be solved urgently.

Utility model content

The utility model provides a displacement meter protection bracket to solve the existing technical problem of preventing the displacement meter from being smashed when the simply supported beam is broken.

The utility model adopts the following technical solutions:

A displacement meter protection bracket includes a support frame and a steel plate arranged on the support frame, the support frame includes two channel steel beams distributed along the lateral direction and at least two support rods fixed on each channel steel beam, Both the channel steel beams extend in the longitudinal direction, the steel plate is fixed above the support rod, and the middle part of the steel plate has a through hole for the displacement gauge to pass through.

Preferably, there are four support rods, which are respectively located at four corners of the steel plate, and two support rods are provided on each channel steel beam, the upper end of each support rod is welded and fixed on the steel plate, and each support rod is The lower end of the rod is welded and fixed on the upper wing plate of the corresponding channel steel beam.

Preferably, there are four support rods, which are respectively located at four corners of the steel plate, and two support rods are provided on each channel steel beam, and both ends of each support rod are provided with external threads, and each support rod is provided with external threads. The upper end of the support rod is inserted on the steel plate and fixed by the nuts on the upper and lower sides of the steel plate, and the lower end of each support rod is inserted on the upper wing plate of the corresponding channel steel beam and is screwed by the nuts on the upper and lower sides of the upper wing plate. Fixed, the length of the thread at the lower end of the support rod is longer than the vertical length of the through hole of the upper wing plate.

Preferably, it also includes a displacement meter fixing mechanism. The displacement meter fixing mechanism includes two electromagnets, a power supply, a plurality of wires, two electrical connection plates, and a fixing frame connecting the two electromagnets. The electromagnet has a plastic shell, and the electromagnetic The two electrical connection contacts of the iron coil are arranged on the top surface of the casing, and the electrical connection plate includes an insulating plate fixed on the lower surface of the iron plate and two electrical connection contacts arranged on the insulating plate for connecting with the corresponding electrical connection contacts. The electrical connection contact piece is drawn out through the wire. The electromagnet, the power supply, the wire and the electrical connection plate form a series circuit. The fixing frame includes the connecting rods fixed on the two electromagnet shells. The free end of each connecting rod is The C-shaped clamps are integrally arranged, and the free ends of the C-shaped clamps have valgus edges. The two C-shaped clamps form a hoop for tightening the displacement meter shell and are connected and fixed on the outer edge through the hoop bolts. Together.

Preferably, two hanging baskets for receiving electromagnets are further arranged below the iron plate, the top of the hanging baskets has an annular connecting surface, which is fixed on the bottom surface of the iron plate through the connecting surface, and the insulating plate is arranged on the corresponding annular connecting surface. face.

The simply supported beam bending test device includes a test bench, a fatigue testing machine set on the test bench, and a displacement gauge protection bracket set below the fatigue testing machine. "-shaped groove, fixed bolts are arranged in the groove, the width of the groove slot is smaller than the width of the lower end of the bolt, the upper end of the fixed bolt passes through the lower wing plate of the channel steel beam and realizes the channel steel beam through the nut. Fixing on the test bench.

The beneficial effects of the utility model are: when in use, the displacement meter is installed under the protection bracket of the displacement meter, the protection bracket of the displacement meter is fixed under the fatigue testing machine, and the measuring rod of the displacement meter passes through the steel plate through the perforation on the steel plate, and resists the The simply supported beam is used for measurement. When the simply supported beam breaks, the measuring rod of the displacement meter retracts downward, and the simply supported beam hits the steel plate protecting the bracket, so as to avoid damage to the displacement meter, which is simple and practical.

Further, both ends of the support rod are provided with external threads, and the thread length of the lower end of the support 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 under the upper wing plate. , so that the displacement gauge protection bracket can be suitable for simply supported beams with more heights.

Further, for some usage scenarios, such as the displacement gauge protection bracket cannot be adjusted in height, or the adjustment ability is limited, in the case of the simply supported beam being too high, the displacement gauge shell has to be extended upwards with the iron plate to meet the measuring rod. Contacting the lower surface of the simply supported beam, in order to avoid the displacement meter from being damaged when the simply supported beam breaks, this scheme cleverly designs a series circuit. By adjusting the current, the attraction between the electromagnet and the iron plate is slightly greater than the displacement The sum of the gravity of the fixing mechanism and the displacement meter is measured. During the measurement process, the displacement meter shell does not move at all, which ensures the measurement accuracy. When the simply supported beam breaks and hits the top of the displacement meter shell, once the set maximum magnetic force is exceeded. , that is, if the total attraction force is exceeded, the electrical connection contact will be separated from the electrical connection contact piece. Once separated, the magnetic force will disappear instantly, and the fixed mechanism of the displacement meter only bears the action of gravity, which is similar to the free fall state, and the broken simply supported beam Unable to continue to apply pressure to the displacement meter, the displacement meter fixing mechanism fell on the test bench, and it is very ingenious to ensure that the displacement meter is intact by laying a sponge.

Furthermore, there are two hanging baskets under the iron plate for receiving electromagnets. After the electromagnet hanging baskets fall off, they fall directly into the hanging baskets to further prevent the damage of the displacement meter, and there is no need to lay buffers on the test bench.

The simply supported beam bending test device is provided with the displacement meter protection bracket of the above structure, which protects the displacement meter well and saves the property and time loss caused by the damage of the displacement meter.

Description of drawings

Fig. 1 is the longitudinal structure schematic diagram of a kind of displacement meter protection bracket of the present invention;

Fig. 2 is the top-view structure schematic diagram of electromagnet and fixing frame;

Fig. 3 is the partial enlarged view of A place in Fig. 1;

4 is a schematic diagram of a series circuit in a displacement meter protection bracket of the present invention;

5 is a schematic structural diagram of a hanging basket in a displacement meter protection bracket of the present invention;

FIG. 6 is another structural schematic diagram of the displacement meter protection bracket of the present invention

7 is a schematic diagram of the longitudinal structure of the simply supported beam bending test device of the present invention.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

An embodiment of a displacement gauge protection bracket, as shown in Figures 1-5, includes a support frame and a steel plate 8 arranged on the support frame, and the support frame includes a first channel steel beam 1 and a second channel steel distributed along the transverse direction. The steel beam 34 and the first support rod 6 and the second support rod 17 fixed on each channel steel beam, the two channel steel beams extend in the longitudinal direction, the steel plate is fixed above the support rod, and the middle part of the steel plate has a Through holes (not shown in the figure) for the displacement gauge to pass through, in this embodiment, the two first support rods 6 and the two second support rods 17 are respectively located at the four corners of the steel plate, and each channel steel beam There are two support rods, distributed along the longitudinal direction, the upper end of each support rod is provided with a first external thread 5, the lower end of each support rod is provided with a second external thread 10, the upper end of the support rod is inserted on the steel plate and passes through the The nuts 7 and 9 on the upper and lower sides of the steel plate are screwed and fixed, the lower end of the first support rod is inserted on the upper wing plate 3 of the first channel steel beam, and the lower end of the second support rod is inserted in the second channel steel beam. On the upper wing plate 18 of the upper wing plate, and screwed and fixed by the nuts 2 and 4 on the upper and lower sides of the upper wing plate, in order to facilitate the adjustment of the height of the steel plate, the thread length of the lower end of the support rod is longer than the vertical length of the through hole of the upper wing plate. By screwing the nuts on the upper and lower sides of the upper wing plate, the support rod can be adjusted to rise or fall, so as to achieve the purpose of adjusting the height of the steel plate.

In other embodiments, such as shown in FIG. 6, there are four support rods 37 and 38, which are respectively located at the four corners of the steel plate and two support rods are arranged on each channel steel beam, and the upper end of each support rod is welded and fixed to 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 usage scenarios, for example, the height of the protective bracket of the displacement gauge cannot be adjusted due to its own structure, or the adjustment ability is limited due to the limited vertical width of the channel steel beam itself. In some cases where the simply supported beam is too high, it has to The displacement meter housing 13 is extended upwards from the iron plate to meet the requirement that the measuring rod 14 contacts the lower surface of the simply supported beam 47. In this case, in order to avoid the displacement meter from being damaged when the simply supported beam is broken, this embodiment The solution also includes a displacement meter fixing mechanism arranged under the iron plate, and the displacement meter fixing mechanism includes two electromagnets 11, 16, a power supply 22, a plurality of wires 20, two electrical connection plates 12, 15 and connecting two electromagnets The electromagnet has a plastic casing. In this embodiment, the plastic casing is cylindrical, and the two sets of electrical connection contacts 27 and 28 of the coils of the two electromagnets pass through the top surfaces of the respective plastic casings and protrude out of the respective plastic casings. On the top surface, the electrical connecting plate includes an insulating plate fixed on the lower surface of the iron plate and two electrical connecting contact pieces arranged on the insulating plate for connecting with the corresponding electrical connecting contacts. The electrical connecting contact pieces are fitted and fixed. The copper sheets 39 and 40 on the lower surface of the insulating plate, the insulating plate is a rubber plate, and is pasted on the lower surface of the iron plate. In other embodiments, screw holes can also be provided on the iron plate, and the rubber plate is fixed on the iron plate by screws. superior. The electrical connection contacts are drawn out through the wires 20. In this embodiment, the wires are embedded in the rubber plate. The two electrical connection plates are arranged in series through the wires 20. The electromagnets 11 and 16, the power supply 22, the wires 20 and the electrical connection plates 12 and 16 are formed A series loop, the power supply can be a battery, or the mains power after rectification and filtering. The fixing frame includes connecting rods 24 and 26 fixed on the two electromagnet shells, and the free end of each connecting rod is integrally provided with a C-shaped The free ends of the clamps 29 and 30 and the C-shaped clamps have valgus edges 32 and 33. The two C-shaped clamps form a clamp for holding the displacement meter housing 13 and pass through the clamp bolts 31. To be fixed together along the connection, the connecting rod and the C-shaped clamp can be made of aluminum or plastic, and can be inserted or glued together with the electromagnet shell by hot melt or integrated. The bottom of the iron plate is also provided with two hanging baskets 23 and 25 for receiving electromagnets. The top of the hanging basket has an annular connecting surface 232. The connecting surface of the hanging basket is fixed on the bottom surface of the iron plate, the insulating plate is arranged in the corresponding annular connecting surface, and the connecting surface can be glued on the iron plate or fixed on the iron plate by screws.

This scheme cleverly designs a series circuit. By adjusting the current, there are various current adjustment methods, all of which are in the prior art. The easiest way is to increase or decrease the number of batteries or connect a sliding rheostat in series. The electromagnetic force and the iron plate attraction are generated, and the total attraction force is slightly larger than the sum of the gravity of the displacement meter fixing mechanism and the displacement meter through adjustment. , During installation, only the electrical connection contacts of the electromagnet are required to contact the electrical connection contacts, the circuit forms a series circuit, and the displacement meter fixing mechanism can be firmly adsorbed on the iron plate. During the measurement process, the displacement meter shell does not move. , to ensure the measurement accuracy, and when the simply supported beam is broken and 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 electrical connection contacts will be separated from the electrical connection contacts. Once it is detached and the series circuit is disconnected, the magnetic force disappears instantly, and the fixed mechanism of the displacement meter only bears the action of gravity, which is similar to the state of free fall. The plate is blocked, and the force of the displacement meter is relatively small in the whole process, and it is not easy to be damaged. In this embodiment, there are also two hanging baskets under the iron plate for receiving the electromagnets. After the electromagnet hanging baskets fall off, they fall directly into the hanging baskets, which further prevents the damage of the displacement meter and does not need to lay buffers on the test bench. .

In other embodiments, no hanging basket is provided, the displacement meter fixing mechanism is dropped on the test bench, and it is very ingenious to ensure that the displacement meter is intact and damaged only by laying a sponge.

An embodiment of a simply supported beam bending test device, as shown in FIG. 7 , includes a test bench 45, a fatigue testing machine 39 arranged on the testing bench, and a displacement gauge protection as described in the above-mentioned embodiments arranged below the fatigue testing machine. Bracket, the test bench distributes two longitudinally extending grooves 42, 43 with a "convex" shape in cross-section, and fixing bolts 41, 44 are arranged in the grooves, and the width of the groove slot is smaller than the width of the lower end of the bolt. width, the upper ends of the fixing bolts pass through the lower wings 21 and 35 of the channel steel beam, and the channel steel beam is fixed on the test bench by nuts. During the test, the simply supported beam is placed on the support seat 46 and simply supported The middle part of the beam is located just below the hydraulic rod in the fatigue testing machine. The fatigue testing machine and the support seat are all in the prior art, and will not be repeated here. The simply supported beam bending test device is provided with the displacement meter protection bracket of the above structure, which protects the displacement meter well and saves the property and time loss caused by the damage of the displacement meter.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (6)

1. A displacement meter protective cradle which is characterized in that: 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.

2. A displacement meter protective bracket according to claim 1, 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.

3. A displacement meter protective bracket according to claim 1, 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.

4. A displacement meter protective bracket according to claim 1, 2 or 3, wherein: also comprises a displacement meter fixing mechanism, 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.

5. A displacement meter protective bracket according to claim 4, characterized in that: 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.

6. Simple beam flexural test device, its characterized in that: the displacement meter protection support comprises a test bed, a fatigue testing machine arranged on the test bed and the displacement meter protection support as claimed in any one of claims 1 to 5 arranged below the fatigue testing machine, wherein two grooves with the cross sections extending along the longitudinal direction are transversely distributed on the test bed and in a shape like a Chinese character 'tu', 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 upper ends of the fixing bolts penetrate through lower wing plates of channel steel beams and are fixed on the test bed through nuts.

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