CN204286971U - The charger of a kind of concrete sample corrosion test under effect of stress - Google Patents

Abstract

The utility model discloses a loading device for the corrosion test of concrete samples under the action of stress, which comprises a frame, a loading mechanism, a force transmission mechanism, a sample fixture and a container for containing corrosion liquid. The force transmission mechanism connects with the sample through a connecting rod Fixture connection. The sample fixture includes a pressure device and an adjustment device, the adjustment device includes a control circuit, a servo motor and a lift; the lift is driven by a servo motor, and the servo motor is connected to the control circuit; one end of the pressure device is connected to the connecting rod, and the other end is connected to the lift. The control circuit of the utility model monitors the loading mechanism, automatically adjusts the height of the elevator according to the state of the loading mechanism, can automatically compensate the stress relaxation of the concrete sample, and keep the stress of the concrete sample constant.

Description

A loading device for corrosion test of concrete samples under stress

[technical field]

The utility model relates to a loading device for a concrete corrosion test, in particular to a loading device for a concrete sample corrosion test under stress.

[Background technique]

Bearing load is the main mission and inherent characteristic of concrete as a structural functional material. The existence of load will cause the creep and relaxation of concrete, and lead to the failure of concrete before reaching its due ultimate bearing capacity, affecting the long-term performance and safety of concrete structures. sex. Furthermore, due to early people's unclear understanding and insufficient attention to the durability of concrete structures, the harsh environment in which the concrete structures are located will have an impact on the mechanical properties of the concrete structures, forming environmental corrosion to the concrete structures, and the magnitude of the load And the form will further affect the degradation rate of the concrete structure by environmental corrosion. In order to accurately analyze the mechanical properties of concrete structures after simultaneous stress and environmental corrosion, it is very important to understand the coupling effect of stress and environmental corrosion on the mechanical properties of concrete, and corresponding corrosion devices are required. At present, people have designed various stress corrosion devices. The stress corrosion devices seen on the market use spring structures, mechanical transmission systems, hydraulic control systems or counterweights to apply tension or pressure to the test pieces, and the continuous loading process is measured by instruments. Relevant parameters of the concrete members. However, most of these devices do not involve coupling with environmental corrosion, and have the following disadvantages:

After a long period of stretching or compression of the spring or mechanical transmission system, stress relaxation will occur, and the load will gradually decrease, which will affect the loading accuracy and bring great difficulties to the analysis of test results.

Member deformation caused by concrete creep further increases the stress relaxation of springs or loading devices of mechanical transmission systems.

The stress corrosion device of the hydraulic system needs to design a corresponding control system, which is complicated and costly.

The invention patent with the patent number of 200810066321.6 discloses a loading device for the corrosion test of concrete samples under stress, including a frame, a graduated upper beam, a lower beam, loading weights, a dowel bar, an upper force roller and The lower afterburner, one end of the upper beam is hinged with one side of the frame, the other end is hung with a loading weight, and there is an upper slider in the middle that slides longitudinally along the upper beam; the concrete sample is placed on the upper afterburner and Between the lower force rollers, the lower part of the dowel bar transmits force to the concrete sample through the upper force rollers, and the lower force rollers are supported by the base of the frame. The other side of the frame is hinged, the upper slide block is pressed on the top of the lower beam, and the lower beam is pressed on the top of the dowel bar. This invention can overcome the stress relaxation problem of spring applied force, but this loading device has the following disadvantages in use: 1) adopt two afterburner rollers to apply stress, need to adopt two scales, the magnitude of applied force is not intuitive, the stress The calculation is cumbersome. At the same time, the lower beam needs to be equipped with a scale, and the rigidity is low, so it is impossible to apply a large stress to the test piece; 2) The force application device adopts a common hinged joint, and the force application accuracy is low; 3) It is impossible to realize the concrete test. Automatic compensation for stress relaxation.

[Content of the invention]

The technical problem to be solved by the utility model is to provide a loading device for the corrosion test of the concrete sample under the action of stress, which automatically compensates the stress relaxation of the concrete sample and keeps the stress of the concrete sample constant.

In order to solve the above technical problems, the technical solution adopted by the utility model is a loading device for corrosion test of concrete samples under stress, including a frame, a loading mechanism, a force transmission mechanism, a sample fixture and a container for containing corrosive liquid , the force transmission mechanism is connected with the sample fixture through the connecting rod, the sample fixture includes a pressure device and an adjustment device, the adjustment device includes a control circuit, a servo motor and an elevator; the elevator is driven by a servo motor, and the servo motor is connected to the control circuit; One end of the device is connected to the connecting rod, and the other end is connected to the elevator.

In the above-mentioned loading device, the force transmission mechanism includes a booster lever and a connecting rod. The load mechanism is a weighing lever mechanism with a metering lever as the main body. The booster lever is arranged below the metering lever. The fulcrum tool bearing group is hinged with the frame; the upper end of the connecting rod is connected with the key tool bearing of the metering lever, and the lower end is hinged with the end of the force arm tool bearing group through the force arm of the force lever; the sample fixture passes through the key force of the force lever The knife bearing group is hinged with the afterburner lever.

In the above-mentioned loading device, the weighing lever mechanism includes a scale frame, an increasing mound, a mound hanger, a swimming mound, and the metering lever. The scale frame is fixed on the top of the frame, and the metering lever is connected to The weighing frame is hinged, and the mound hangs on the end of the long force arm of the metering lever through the mound hanging knife bearing group; the loading amount can be changed by increasing or decreasing the increasing mound and adjusting the position of the swimming mound.

In the loading device described above, the upper part of the frame includes an upper beam, the fulcrum knife bearing of the booster lever is fixed below the upper beam, and the fulcrum knife of the booster lever is fixed on the booster lever; the connecting rod is an adjustable length connecting rod .

In the loading device described above, the base of the frame includes a lower beam, and the elevator is fixed on the lower beam; the top of the elevator includes a lifting plate and a plurality of uprights, and the lower end of the upright is fixed on the lifting plate; the sample fixture includes a connector, a pull rod, Pull plate, support plate, pressure plate and a plurality of tension screws, the periphery of the pressure plate includes a plurality of column holes, the column passes through the column hole, and the thread on the upper end of the column is screwed with a nut to fix the pressure plate on the column; the pressure plate includes a plurality of screw holes , the lower end of the tension screw is fixed on the supporting plate, the upper part passes through the screw hole of the pressure plate, and the upper end is fixed with the pull plate; the middle part of the pull plate is fixed with the pull rod, the upper end of the pull rod is connected with the connector, and the upper part of the connector is connected with the The rod is connected; the concrete sample is placed between the supporting plate and the pressing plate.

In the loading device mentioned above, the container is placed between the lifting plate and the pressure plate, and the concrete sample and the supporting plate are arranged in the container.

The above-mentioned loading device, the connecting head includes a connecting fork, a spherical sleeve and a pin shaft, the end of the connecting fork includes a threaded hole, and the external thread on the upper end of the pull rod is screwed into the threaded hole of the connecting fork; the fork of the connecting fork includes a pin One end of the connecting rod includes an external thread, and the other end includes a spherical hole, and the spherical sleeve is installed in the spherical hole, and the outer surface of the spherical sleeve is adapted to the spherical hole; the pin shaft passes through the pin hole of the connecting fork and the spherical sleeve The inner hole of the connecting rod is combined with the connecting fork; the external thread of the connecting rod is screwed into the threaded hole of the key knife bearing of the afterburning lever.

In the loading device described above, the fulcrum knife bearing of the booster lever and the key knife bearing of the booster lever each include a U-shaped knife bearing seat, two connecting plates and two knife bearing blocks, and the U-shaped knife bearing seat includes a connecting portion And two side plates, the connecting part includes threaded holes, the side plate is hook-shaped, the knife bearing block is fixed on the inside of the hook head of the side plate, and the opening of the side plate is connected into one by the connecting plate; the fulcrum knife of the afterburner lever and the afterburner The key knife of lever is respectively fixed in the fulcrum knife hole and the key knife hole of the afterburning lever.

The above-mentioned loading device, the adjustment device includes a worm gear reducer; the elevator is driven by a servo motor through the worm gear reducer; the control circuit includes a controller and two position sensors, and the two position sensors are arranged on the front sight position on the scale frame, They are respectively located above and below the metering lever; the signal output ends of the two position sensors are respectively connected to the controller, and the output end of the controller is connected to the servo motor.

In the above-mentioned loading device, the included angle between the metering lever and the afterburning lever is 10-20° when viewed from the projection plane; the weighing lever mechanism includes a counterweight, and the counterweight is installed at the end of the short arm of the metering lever

The control circuit of the loading device of the utility model monitors the loading mechanism, automatically adjusts the height of the elevator according to the state of the loading mechanism, can automatically compensate the stress relaxation of the concrete sample, and keep the stress of the concrete sample constant.

[Description of drawings]

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is a structural diagram of the loading device of the embodiment of the utility model.

Fig. 2 is a top view of the loading device of the embodiment of the utility model.

Fig. 3 is a partially enlarged view of part I in Fig. 1 .

Fig. 4 is a front view of the booster lever of the embodiment of the utility model.

Fig. 5 is a top view of the booster lever of the embodiment of the utility model.

Fig. 6 is a front view of the tool holder of the utility model embodiment of the force-added lever.

Fig. 7 is a cross-sectional view taken along line A in Fig. 6 .

Fig. 8 is a front view of the knife block of the utility model embodiment of the force-added lever.

Fig. 9 is a top view of the knife block of the utility model embodiment of the force-added lever.

Fig. 10 is the front view of the fulcrum knife and the key knife of the utility model embodiment of the booster lever.

Fig. 11 is the left side view of the fulcrum knife and the key knife of the utility model embodiment.

Fig. 12 is a functional block diagram of the control circuit of the embodiment of the utility model.

[Detailed ways]

The structure of the embodiment of the loading device for the corrosion test of concrete samples under stress of the present invention is shown in Figures 1 to 11, including a frame 1, a loading mechanism, a force transmission mechanism, a sample fixture and a container for containing corrosive liquid. The force transmission mechanism is connected to the sample fixture through the connecting rod. The sample fixture includes a pressure device and an adjustment device. The adjustment device includes a control circuit, a servo motor and an elevator; the elevator is driven by a servo motor, and the servo motor is connected to the control circuit; the pressure device One end is connected to the connecting rod, and the other end is connected to the elevator; the control circuit monitors the loading mechanism, and automatically adjusts the height of the elevator according to the state of the loading mechanism.

The force transmission mechanism includes a force-adding lever 10 and a connecting rod 14 .

The loading mechanism is a weighing lever mechanism whose main body is the metering lever 2 .

The metering lever 2 and the boosting lever 10 are mutually staggered, and the included angle α between the metering lever 2 and the boosting lever 10 is 13° on the projected plane viewed from above.

The weighing lever mechanism also includes a scale frame 3, an increasing mound 4, a mound hanging 5, a counterweight 6 and a swimming mound 7. The scale frame 3 is fixed on the top of the frame 1, the metering lever 2 is hinged with the scale frame 3 through the metering lever fulcrum knife bearing group (the metering lever fulcrum knife bearing group is not shown), the weight hanging 5 is suspended on the The end of the long moment arm of metering lever 2.

The adding lever 10 is arranged under the metering lever 2, and the adding lever 10 is hinged with the frame 1 through the adding lever fulcrum knife bearing group. The sample fixture is hinged with the force lever 10 through the key tool bearing group of the force lever.

The structure of the boosting lever 10 is shown in FIG. 4 and FIG. 5 , including a fulcrum hole 1001 , a key hole 1002 and a force arm hole 1003 of the boosting lever. The fulcrum knife 8 and the key knife 9 of the boosting lever 10 are respectively fixed in the fulcrum knife hole 1001 and the key knife hole 1002 of the boosting lever 10, and the boosting lever force arm knife hole 1003 is fixed with the power boosting lever force arm knife.

The fulcrum knife bearing of the booster lever 10 and the key knife bearing of the booster lever 10 each comprise a U-shaped knife bearing seat 11, two connecting plates 12 and two knife bearing blocks 13, and the U-shaped knife bearing seat includes a connecting portion 1101 and Two side plates 1102 have a threaded hole 1103 in the connecting portion, and the side plates 1102 are hook-shaped, and the knife holder block 14 is fixed on the inboard of the side plate 1102 hooks, and the opening of the side plates 1102 is connected into one by the connecting plate 12 by screws.

The metering lever 2 transmits force to the adding lever 10 through the connecting rod 14, and the connecting rod 14 is a connecting rod with adjustable length.

The upper end of connecting rod 14 is connected with the knife bearing 25 of the key knife bearing group of the metering lever, and the lower end is hinged with the end of the adding lever force arm knife bearing group 26 and the adding lever 10 force arm.

There is an upper beam 101 on the frame 1 top, and the knife holder 11 of the force-applying lever fulcrum knife bearing is fixed on the below of the upper beam 101 by screws 15 .

A lower beam 102 is arranged on the base of the frame 1, and the elevator 31 is fixed on the lower beam.

The elevator 31 is driven by a servo motor 32 through a worm gear reducer. The control circuit includes a controller and two position sensors 33 , and the two position sensors 33 are arranged at the front sight 310 of the scale frame 3 , respectively above and below the measuring lever 2 .

As shown in Figure 12, the signal output terminals of two position sensors 33 are respectively connected to the controller, and the output terminals of the controller are connected to the servo motor 32; Adjust the height of the elevator 31 to achieve a constant corrosion stress of the test piece.

The top of lifter 31 comprises lifting plate 34 and 4 columns 35, and the lower end of column 35 is fixed on the lifting plate 34.

The sample fixture includes a connection head, a pull rod 37 , a pull plate 38 , a supporting plate 39 , a pressure plate 40 and four tension screws 41 . Four jiaos of pressing plate 40 have 4 column holes altogether, and column 35 passes column hole, and the thread on the upper end of column 35 is screwed with nut 42 and pressing plate 40 is fixed on the column 35.

Pressing plate 40 also comprises 4 screw holes, and the lower end of tension screw 41 is fixed on the supporting plate 39, and the top passes through the screw hole of pressing plate 40, and the upper end of tension screw 41 is fixed with pull plate 38 by nut 43.

The middle part of pull plate 38 is fixed with the lower end of pull rod 37, and the upper end of pull rod 37 is connected with connecting head, and the top of connecting head is connected with connecting rod 19. The concrete sample 100 is placed between the supporting plate 39 and the pressing plate 40 .

The container 28 containing the corrosive liquid is placed between the lifting plate 34 and the pressing plate 40, and the concrete sample 100 and the supporting plate 39 are immersed in the container 28.

The connector includes a connecting fork 20 , a spherical sleeve 21 and a pin shaft 22 . There is a threaded hole at the end of the connecting fork 20 , and the external thread on the upper end of the concrete sample steel bar 200 is screwed into the threaded hole of the connecting fork 20 . The fork of connecting fork 20 has a pin hole, and one end of connecting rod 19 has external thread, and the other end has a spherical hole, and spherical sleeve 21 is installed in the spherical hole of connecting rod 19, and the outer surface of spherical sleeve 21 and The spherical hole is adapted, and the two form a universal hinge. The pin shaft 22 passes through the pin hole of the connecting fork 20 and the inner hole of the spherical sleeve 21 to combine the connecting rod 19 and the connecting fork 20 together. The external thread of connecting rod 19 is screwed in the threaded hole of force lever key cutter holder cutter holder 11.

The test piece 100 is immersed in a container 28 containing a corrosive liquid to achieve accelerated deterioration of the test piece. Before loading, adjust the initial zero point balance through the counterweight 6, and one end of the power arm of the metering lever 2 can hang the weight 4 through the weight hanging 5, and the height position of the connector of the sample fixture can be changed by adjusting the length of the adjustable connecting rod 14.

The metering lever 2 changes the size of the loading amount by increasing or decreasing the increasing weight 4 and moving and adjusting the floating weight 7, and can directly read the loading amount of the load.

The fulcrum and bearing point of metering lever 2 and afterburning lever 10 all use knife bearing structure.

The above embodiments of the utility model adopt the above-mentioned multi-stage lever structure, and the fulcrum and load-bearing point of the large and small levers all use a knife and a knife bearing structure, which has small frictional resistance and high precision of force transmission. Compared with the existing stress corrosion device, the device Small size, simple manufacture, low cost, high rigidity, high precision, and simpler operation. The stress corrosion of components is realized through the secondary amplification of the lever, and the amplitude of the carrying stress is significantly improved, which can be applied to larger specimens.

The sample fixture of the above embodiments of the utility model includes a pressurizing device and an adjusting device, and adjusts the height of the lifter through the position information of the measuring lever obtained by the position sensing position sensor installed on the measuring lever weighing frame next to the measuring lever's front sight, which can Ensure the application of constant corrosion stress, eliminate the relaxation of corrosion stress, and realize the electric servo function of stress loading.

Claims (10)

1. the charger of concrete sample corrosion test under effect of stress, comprise the container of frame, load maintainer, force transmission mechanism, specimen holder and splendid attire corrosive liquid, force transmission mechanism is connected with specimen holder by connecting link, it is characterized in that, specimen holder comprises pressue device and regulating device, and regulating device comprises control circuit, servomotor and lifter; Lifter is by driven by servomotor, and servomotor is connected with control circuit; The connecting link described in one termination of pressue device, another termination lifter.

2. charger according to claim 1, it is characterized in that, force transmission mechanism comprises afterburning lever and connecting rod, load maintainer is the leverage of weighing based on measuring lever, afterburning lever arrangement is in the below of measuring lever, and it is hinged with frame that afterburning lever holds group by the fulcrum pivot of afterburning lever; The upper end of connecting rod is held with the emphasing knife of measuring lever and is connected, and the end that group and afterburning lever are held by afterburning lever arm of force cutter in lower end is hinged; Specimen holder by the emphasing knife of afterburning lever hold group with afterburning lever hinged.

3. charger according to claim 2, it is characterized in that, leverage of weighing comprises scale frame, increases stone roller, stone roller is hung and, sliding weight and described measuring lever, scale frame is fixed on the top of frame, measuring lever by measuring lever fulcrum pivot hold group with scale frame hinged, stone roller hang by stone roller hang cutter hold the end that group is suspended on the long arm of force of measuring lever; The size of the position change heap(ed) capacity of stone roller and adjustment sliding weight is increased by increase and decrease.

4. charger according to claim 2, is characterized in that, upper rack comprises entablature, and the fulcrum pivot of afterburning lever holds and is fixed on below entablature, and the fulcrum pivot of afterburning lever is fixed on afterburning lever; Described connecting rod is adjustable in length connecting rod.

5. charger according to claim 2, is characterized in that, the base of frame comprises sill, and lifter is fixed on sill; The top of lifter comprises lifter plate and complex root column, and the lower end of column is fixed on lifter plate; Specimen holder comprises connector, pull bar, arm-tie, supporting plate, pressing plate and complex root pulling force screw rod, and the periphery of pressing plate comprises a plurality of leghole, and column, through leghole, the screw thread of the upper end of column is rotary with nut and is fixed on column by pressing plate; Pressing plate comprises a plurality of screw hole, and the lower end of pulling force screw rod is fixed on supporting plate, and top is through the screw hole of pressing plate, and upper end and arm-tie are fixed; Middle part and the pull bar of arm-tie are fixed, and the upper end of pull bar is connected with connector, and the top of connector is connected with described connecting link; Described concrete sample is placed between supporting plate and pressing plate.

6. charger according to claim 5, is characterized in that, described container is placed between lifter plate and pressing plate, and concrete sample and supporting plate are arranged in a reservoir.

7. charger according to claim 5, is characterized in that, connector comprises yoke, spherical sleeve and bearing pin, and the end of yoke comprises threaded hole, pull bar upper end screw in the threaded hole of yoke; The fork of yoke comprises pin-and-hole, and one end of connecting link comprises external thread, and the other end comprises sphere hole, and spherical sleeve is arranged in sphere hole, the outside surface of spherical sleeve and sphere hole adaptation; Connecting link and yoke, through the pin-and-hole of yoke and the endoporus of spherical sleeve, are combined by bearing pin; In the threaded hole that the emphasing knife screwing into afterburning lever of connecting link holds.

8. charger according to claim 2, it is characterized in that, the fulcrum pivot of afterburning lever holds and holds the cutter bearing respectively comprising U-shaped, two pieces of web joints and two pieces of cutter supporting blocks with the emphasing knife of afterburning lever, U-shaped cutter bearing comprises connecting portion and two blocks of side plates, connecting portion comprises threaded hole, side plate is hook-type, and cutter supporting block is fixed on the inner side of side plate gib head, and the opening of side plate is linked into an integrated entity by web joint; In the fulcrum tool bore that the afterburning fulcrum pivot of lever and the emphasing knife of afterburning lever are separately fixed at afterburning lever and emphasis tool bore.

9. charger according to claim 3, is characterized in that, regulating device comprises worm type of reduction gearing; Lifter is driven by worm type of reduction gearing by servomotor; Control circuit comprises controller and two position transducers, and two position transducers are arranged in the foresight position on scale frame, lay respectively at above and below measuring lever; The signal output part of two position transducers connects controller respectively, the output servo motor termination of controller.

10. charger according to claim 3, is characterized in that, in downward projection face, the angle of measuring lever and afterburning lever is 10-20 °; Leverage of weighing comprises balance bob, and balance bob is arranged on the end of the short arm of force of measuring lever.