CN219830557U - Test stand for elastic modulus test of plastic concrete sample - Google Patents
Test stand for elastic modulus test of plastic concrete sample Download PDFInfo
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- CN219830557U CN219830557U CN202321337588.0U CN202321337588U CN219830557U CN 219830557 U CN219830557 U CN 219830557U CN 202321337588 U CN202321337588 U CN 202321337588U CN 219830557 U CN219830557 U CN 219830557U
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a test stand for elastic modulus test of plastic concrete samples, which comprises an upper bearing plate and a lower bearing plate, and further comprises: the rack is provided with a base, a pair of supporting frames and a pair of guide rails; the driving device is arranged on the frame, the power source of the driving device is a servo motor, the servo motor is connected with a beam which can move along a pair of guide rails, and the upper bearing plate is fixedly connected with the beam; a pair of measuring rods which are arranged at two sides of the upper bearing plate and can move up and down relative to the upper bearing plate; and the pair of grating rulers are fixedly arranged on two sides of the lower bearing plate and positioned under the pair of measuring rods and used for collecting corresponding side displacement information when the sample is extruded. The test stand disclosed by the utility model is small in size, light in weight, convenient for installing a plastic concrete sample, and the servo motor is used as a power source, does not need an oil source, is cleaner, is more convenient to use and maintain, can truly reflect the displacement change of the sample after being stressed, ensures that the elastic modulus calculated later is more accurate, only needs one person in the test process, saves labor and reduces labor cost.
Description
Technical Field
The utility model relates to the technical field of hydraulic engineering, in particular to a test stand for measuring elastic modulus of a plastic concrete sample applied to hydraulic engineering.
Background
The plastic concrete is a high-fluidity concrete with low cement consumption and more bentonite, clay and other materials, has the characteristics of low strength, low elastic modulus, high strain and the like, is a flexible material, can be well adapted to softer foundation, has good seepage-proofing performance, and is more applied to seepage proofing of hydraulic engineering. Because the performance of plastic concrete is between that of soil and ordinary concrete, it has good extrusion deformation capability, so it is often used as a flexible impervious material in hydraulic engineering.
The static compression elastic modulus is an important mechanical index of plastic concrete, reflects the relation between stress and strain of the plastic concrete, and is an important parameter for designing the mixing ratio of the plastic concrete in hydraulic engineering, so that a plastic concrete sample needs to be tested before the plastic concrete is applied.
At present, in the water conservancy industry, a common press with a power source being a hydraulic system is generally adopted for elastic modulus test, for example, the structure of the press shown in fig. 1 is adopted, an upper pressing plate n is attached to the upper surface of a test piece mounted on a lower pressing plate t under the action of external force and then stops, and then the lower pressing plate rises under the pushing action of a hydraulic cylinder so as to squeeze the test piece. And two sides of the lower pressing plate are provided with a pair of dial gauges m, and the deformation of the plastic concrete test piece in the static compression test process is measured through the pair of dial gauges. The common press machine mostly adopts a high-pressure hydraulic source as a power source, has huge volume and large measuring force value range, and the required force value is smaller when the elastic modulus test is carried out on the plastic concrete test piece, so that the accuracy is poor and the process controllability is poor when the press machine is adopted for the test. And the press adopts the dial indicator to measure the deformation of the test piece, and three persons are required to cooperatively operate in the test process: one person controls the testing machine, two persons read the dial indicator manually, so that manpower is wasted greatly, labor cost is high, manual reading accuracy is low, and testing error is large.
In addition, the structure disclosed by the full-range static compression elastic modulus test stand of plastic concrete with the name of CN202471504U can be adopted in the test in the industry, and the full-range static compression elastic modulus test stand comprises an upper pressing plate matched with an upper pressing head of a tester, two upper connecting rods which are symmetrically and vertically fixedly connected with the two ends of the back surface of the upper pressing plate, two lower connecting rods which are symmetrically and vertically fixedly connected with the two ends of the top surface of a lower pressing plate matched with a lower pressing head of the tester, and a support is arranged at the top end of the lower connecting rods; the connecting device at the inner end of the two-way connecting piece is matched and connected with the upper connecting rod of the upper pressing plate, the measuring device is arranged at the connecting device at the outer end of the two-way connecting piece in a matched mode, a plastic concrete test piece is arranged between the upper pressing plate and the lower pressing plate, and the measuring head of the measuring device arranged on the upper connecting rod through the two-way connecting piece is matched with the support at the top end of the lower connecting rod. The measuring device is a dial gauge or a displacement sensor. When the test frame is used for carrying out static compression elastic modulus of the plastic concrete test piece, as the upper connecting rod is fixed at one end of the bidirectional connecting piece and the dial indicator or the displacement sensor is fixed at the other end of the bidirectional connecting piece, the upper connecting rod does not directly act on the dial indicator or the displacement sensor by a force, so that the stress of the test piece cannot be truly reflected, and the deformation of the test piece cannot be truly reflected.
Disclosure of Invention
The utility model aims to solve the problems, and provides the test stand for the elastic modulus test of the plastic concrete sample, which has the advantages of small volume, convenience in installation of the plastic concrete sample, good controllability in the test process, cleanliness, convenience in use and maintenance, capability of truly reflecting the displacement change of the sample after being stressed, more accurate elastic modulus calculated later, labor saving and labor cost reduction, and is convenient for installing the plastic concrete sample by using a servo motor as a power source without using an oil source.
In order to achieve the above object, the present utility model provides a test stand for elastic modulus test of plastic concrete samples, comprising an upper bearing plate and a lower bearing plate below the upper bearing plate for placing plastic concrete samples to be tested, further comprising: the rack is provided with a base, a pair of supporting frames vertically arranged on two sides of the base and a pair of guide rails fixedly arranged on the opposite sides of the pair of supporting frames; the driving device is arranged on the frame and used for driving the upper bearing plate to move up and down relative to the lower bearing plate, the power source of the driving device is a servo motor, the servo motor is connected with a beam which can move along a pair of guide rails, and the upper bearing plate is fixedly connected with the beam; a pair of measuring rods which are arranged at two sides of the upper bearing plate and can move up and down relative to the upper bearing plate; and the pair of grating scales are fixedly arranged on two sides of the lower bearing plate and positioned under the pair of measuring rods and used for collecting corresponding side displacement information when the sample is extruded.
Preferably, the upper surface of the base is provided with a ball hinge support, and the lower part of the lower bearing plate is hinged with the ball hinge support.
Preferably, the driving device comprises a pair of servo motors which are arranged in the base and positioned at two sides, and each servo motor is connected with one side of the cross beam through a transmission mechanism.
Preferably, the transmission mechanism is a screw-nut transmission mechanism, and a nut of the transmission mechanism is fixedly connected with one side of the cross beam.
Preferably, a pair of connecting seats are symmetrically arranged on two sides of the upper bearing plate, vertical through holes are formed in the connecting seats, and each measuring rod penetrates through the through hole of the corresponding side connecting seat.
Preferably, the connecting seat is provided with a screw hole which is axially perpendicular to the through hole, and the screw hole is in threaded connection with a bolt for fastening a measuring rod penetrating through the through hole.
Further, the device also comprises a data acquisition device which is connected with the pair of grating rulers and is used for receiving and processing displacement information transmitted by the pair of grating rulers.
Further, the system also comprises a computer system connected with the data acquisition device for information exchange with the data acquisition device.
Compared with the prior art, the test stand for the elastic modulus test of the plastic concrete sample has the following advantages:
according to the test stand, the space between the upper bearing plate and the lower bearing plate is adjustable, so that the plastic concrete sample can be conveniently installed; the servo motor is used as a power source, an oil source is not needed, the motor is cleaner, and the motor is more convenient to use and maintain; the servo motor is arranged in the base, so that the whole structure is compact, the volume is small, and the weight is light; the servo motor is adopted to drive the cross beam to move, the test speed and the test travel can be determined as required, the test is more flexible, the displacement value of the sample after being stressed can be truly reflected, and the elastic modulus obtained later is more accurate; compared with the prior art, the testing machine needs three professional technicians to participate simultaneously, so that the personnel cost is greatly reduced; in addition, the displacement value of the plastic concrete sample in the test is measured by adopting the electronic grating ruler and the measuring rod, so that the precision is higher.
The present utility model will be described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a partial schematic view of a prior art full scale static compressive elastic modulus tester for plastic concrete;
FIG. 2 is a schematic structural view of a test stand for elastic modulus test of plastic concrete samples according to the present utility model;
FIG. 3 is an enlarged partial schematic view of the upper and lower bearing plate portions of the test stand of the present utility model;
FIG. 4 is an enlarged schematic view of a portion of the drive means in the test stand of the present utility model.
Detailed Description
Fig. 2 is a schematic structural view of a test stand for elastic modulus test of plastic concrete samples according to the present utility model, and fig. 3 and 4 are enlarged schematic partial views of upper and lower bearing plate portions and driving device portions of the test stand according to the present utility model, respectively. As can be seen from fig. 2 to 4, the test stand of the present utility model comprises an upper bearing plate 5 and a lower bearing plate 3 positioned below the upper bearing plate for placing a plastic concrete sample 4 to be tested, and further comprises: the frame 1 is provided with a base 1a, a pair of supporting frames 1b vertically arranged on two sides of the base and a pair of guide rails 1c fixedly arranged on the opposite sides of the pair of supporting frames; the driving device is arranged on the frame and used for driving the upper bearing plate to move up and down relative to the lower bearing plate, the power source of the driving device is a servo motor 71, the servo motor is connected with a beam 74 which can move along a pair of guide rails, and the upper bearing plate is fixedly connected with the beam; a pair of measuring rods 6 installed at both sides of the upper bearing plate and movable up and down with respect thereto; and the pair of grating scales 11 are fixedly arranged on two sides of the lower bearing plate and are positioned right below the pair of measuring rods and used for collecting corresponding side displacement information when the sample is extruded.
Specifically, as shown in fig. 2, the frame of the present utility model includes a base 1a, a pair of supporting frames 1b vertically installed at both sides of the base, a top beam 1d having both ends fixedly connected to the top ends of the pair of supporting frames, and a pair of guide rails 1c fixedly installed at opposite sides of the pair of supporting frames (see fig. 4).
Wherein, the base is box formula structure, and a servo motor 71 in its inside both sides fixed mounting respectively, and every servo motor's output shaft is connected with drive mechanism, and drive mechanism can adopt screw nut drive mechanism, also can adopt rack and pinion drive mechanism, still can adopt prior art to turn into rectilinear motion's mechanism with the rotation. The utility model preferably adopts a screw-nut transmission mechanism, wherein a screw 72 is connected with an output shaft of a servo motor and extends along the vertical direction, and when the screw is assembled, the screw is arranged in a supporting frame and extends along the height direction of the supporting frame, and a nut 73 is fixedly connected with the corresponding side of a beam 74. When a pair of servo motors synchronously rotate, the nuts on the respective lead screws drive the cross beams to move up and down along the guide rails on the support frame. And the lower part of the beam is connected with an upper bearing plate, and when the beam is connected, a connecting seat 75 (see fig. 4) can be arranged at the center of the lower part of the beam, and the upper bearing plate and the connecting seat are fixedly connected together through bolts.
And the center of the upper surface of the base is fixedly provided with a support 2, and the upper part of the support is connected with the lower part of the upper bearing plate. In order to automatically adjust the position of the sample according to the surface condition of the sample in the elastic modulus test process of the plastic concrete sample, the support adopts a spherical hinge support, and the lower part of the lower bearing plate is hinged with the spherical hinge support.
In order to truly reflect the displacement value generated after the test sample is stressed in the test process, a pair of connecting seats 51 are symmetrically arranged on two sides of an upper bearing plate, vertical through holes are formed in the connecting seats, a measuring rod is arranged in each through hole of each connecting seat in a penetrating mode, and the measuring rods are cylindrical rods. And, a pair of grating scales 11 are fixedly installed at both sides of the lower bearing plate, and the pair of grating scales 11 are positioned right below the pair of measuring rods.
In order to adjust the height of the measuring rod relative to the lower bearing plate according to test requirements, screw holes perpendicular to the axial direction of the through holes are formed in the outer side wall of each connecting seat, bolts (or screws) are screwed into the screw holes, the tail ends of the bolts can extend into the screw holes and abut against the outer wall of the measuring rod penetrating through the through holes, and accordingly the measuring rod is fastened on the connecting seats. In design, the tail end of the bolt can be processed into an arc-shaped surface matched with the outer surface of the measuring rod. Of course, other structures of the prior art can be used to fasten the measuring rod to the connection socket.
When the elastic modulus test is required to be carried out on the sample, the sample is placed on the lower bearing plate, the upper bearing plate is synchronously driven to move downwards through the pair of servo motors until the upper bearing plate is contacted with the upper surface of the sample, and then the distance between the measuring rod and the corresponding side grating ruler on the lower bearing plate is adjusted through adjusting the screwing depth of the pair of bolts screwed with the screw holes of the connecting seat on two sides of the upper bearing plate, so that the lower ends of the pair of measuring rods can be respectively propped against the upper surfaces of the pair of grating rulers. When the upper bearing plate is driven to move downwards by the servo motor according to the test rules so as to squeeze the sample, the displacement change of the corresponding side of the sample when the sample is squeezed can be collected in real time by the pair of grating rulers.
The acquired displacement information is transmitted to a data acquisition device connected with a pair of grating rulers through cables or in wireless connection, the data acquisition device receives and processes the displacement information transmitted by the pair of grating rulers, exchanges information with a computer system, and then displays the information on a display screen, so that a tester can acquire displacement change information in real time, and calculate the elastic modulus of a sample according to the displacement information. Because the whole test process can be independently operated only by one, the labor cost is saved. The following data acquisition device receives and processes displacement information transmitted by a pair of grating scales, exchanges information with a computer system and displays the information on a display screen in a prior art mode, and details of the displacement information are not described here.
When the design is adopted, the sizes of the upper bearing plate and the lower bearing plate are consistent, and thick plates with the length and the width of 200mm can be adopted, so that the whole equipment is smaller in size, less in occupied space and lighter in size.
In conclusion, the interval between the upper bearing plate and the lower bearing plate of the test stand is adjustable, so that the plastic concrete sample can be conveniently installed; the servo motor is used as a power source, an oil source is not needed, the motor is cleaner, and the motor is more convenient to use and maintain; the servo motor is arranged in the base, so that the whole structure is compact, the volume is small, and the weight is light; the servo motor is adopted to drive the cross beam to move, the test speed and the test travel can be determined as required, the test is more flexible, the displacement value of the sample after being stressed can be truly reflected, and the elastic modulus obtained later is more accurate; compared with the prior art, the testing machine needs three professional technicians to participate simultaneously, so that the personnel cost is greatly reduced; in addition, the displacement value of the plastic concrete sample in the test is measured by adopting the electronic grating ruler and the measuring rod, so that the precision is higher.
Although the present utility model has been described in detail hereinabove, the present utility model is not limited thereto, and modifications may be made by those skilled in the art in light of the principles of the present utility model, and it is therefore intended that all such modifications as fall within the scope of the present utility model.
Claims (6)
1. A test stand for plastic concrete sample elastic modulus test, including last bearing plate and be located its below be used for settling the plastic concrete sample that awaits measuring down bearing plate, its characterized in that still includes:
the rack is provided with a base, a pair of supporting frames vertically arranged on two sides of the base and a pair of guide rails fixedly arranged on the opposite sides of the pair of supporting frames;
the driving device is arranged on the frame and used for driving the upper bearing plate to move up and down relative to the lower bearing plate, the power source of the driving device is a servo motor, the servo motor is connected with a beam which can move along a pair of guide rails, and the upper bearing plate is fixedly connected with the beam;
a pair of measuring rods which are arranged at two sides of the upper bearing plate and can move up and down relative to the upper bearing plate;
and the pair of grating scales are fixedly arranged on two sides of the lower bearing plate and positioned under the pair of measuring rods and used for collecting corresponding side displacement information when the sample is extruded.
2. The test stand according to claim 1, wherein the upper surface of the base is provided with a ball hinge support, and the lower part of the lower bearing plate is hinged with the ball hinge support.
3. A test stand according to claim 1 or claim 2, in which the drive means comprises a pair of said servomotors mounted in the base on opposite sides, each servomotor being connected to one side of the beam by a transmission mechanism.
4. A test stand according to claim 3, in which the drive is a screw nut drive, the nut of which is fixedly connected to one side of the cross beam.
5. The test stand according to claim 4, wherein a pair of connecting seats are symmetrically arranged on two sides of the upper bearing plate, vertical through holes are formed in the connecting seats, and each measuring rod penetrates through the through hole of the corresponding side connecting seat.
6. The test stand according to claim 5, wherein the connecting seat is provided with a screw hole perpendicular to the axial direction of the through hole, and the screw hole is screwed with a bolt for fastening a measuring rod passing through the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321337588.0U CN219830557U (en) | 2023-05-30 | 2023-05-30 | Test stand for elastic modulus test of plastic concrete sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321337588.0U CN219830557U (en) | 2023-05-30 | 2023-05-30 | Test stand for elastic modulus test of plastic concrete sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219830557U true CN219830557U (en) | 2023-10-13 |
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ID=88246999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321337588.0U Active CN219830557U (en) | 2023-05-30 | 2023-05-30 | Test stand for elastic modulus test of plastic concrete sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219830557U (en) |
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2023
- 2023-05-30 CN CN202321337588.0U patent/CN219830557U/en active Active
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