CN221550355U - Penetrometer calibration device - Google Patents
Penetrometer calibration device Download PDFInfo
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- CN221550355U CN221550355U CN202323506968.5U CN202323506968U CN221550355U CN 221550355 U CN221550355 U CN 221550355U CN 202323506968 U CN202323506968 U CN 202323506968U CN 221550355 U CN221550355 U CN 221550355U
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- penetrometer
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- calibration device
- probe end
- bracket
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- 239000000523 sample Substances 0.000 claims abstract description 41
- 230000008093 supporting effect Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 description 9
- 230000035515 penetration Effects 0.000 description 9
- 239000011888 foil Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The utility model relates to a penetrometer calibration device, which comprises: a support module for supporting the penetrometer to remain upright; the vertical loading module is used for applying vertical load to the stress end of the penetrometer step by step; a stress-strain gauge disposed proximate a probe end of the penetrometer for measuring a stress-strain signal of the probe end when the vertical load is applied to the penetrometer; the resistance metering module is used for measuring the actual loading value of the probe end; and the data acquisition device is in signal connection with the stress strain gauge and is used for acquiring the stress strain signal. The penetrometer calibration device provided by the utility model adopts weights to load step by step and is matched with the accurate resistance metering module, so that the penetrometer can be calibrated indoors more accurately in a low-range.
Description
Technical Field
The utility model belongs to the technical field of geotechnical test equipment, and relates to a penetrometer calibration device.
Background
The full-flow penetrometer (commonly used includes a T-shaped penetrometer, a spherical penetrometer and the like) has the characteristics of effectively increasing test precision, reducing correction influence of hydrostatic pressure and overburden soil weight and reducing influence of soil rigidity and stress anisotropy in test, and has been widely applied to measurement of remolding non-drainage shear strength of soft soil and measurement of non-drainage shear strength of underwater ultra-soft soil.
The method for measuring the resistance applied to the probe end of the penetrometer commonly used at present comprises the following steps: the mechanical signals are output in the form of electric signals through the strain gauge, specifically, the resistance of the probe end of the penetration meter is particularly important because the vertical load is applied to the stress end of the penetration meter to drive the probe to bear the counterforce of soil in the penetration process of the penetration meter, so that the strain gauge of the probe end of the penetration meter is caused to deform, the corresponding resistance of the probe end of the penetration meter is calculated by collecting the strain electric signals output by the strain gauge, and therefore, the relation between the resistance of the probe end of the penetration meter and the strain is accurately calibrated.
However, there are few devices and methods for calibrating the relationship between the resistance and the strain of the probe end of the full-flow penetrometer in the market at present, and most of the calibration modes of the full-flow penetrometer are the triaxial force ring and the oil pressure type for corresponding calibration, however, the two calibration modes have the problem of overlarge measuring range, namely, when the penetrometer is driven to penetrate downwards, the vertical load applied to the stress end of the penetrometer is overlarge, so that the resistance of the probe end is also larger, the triaxial force ring type calibration range is about 10MPa, and the most accurate measuring range of the oil pressure type is about 200-400kPa. The functional relation between the strain electric signal output by the strain gauge and the resistance applied to the probe end is used for calculating the condition that the probe end of the penetration gauge is subjected to smaller resistance, such as underwater ultra-soft soil, the strength of which is only about 20kPa at maximum, and the accuracy cannot be ensured obviously. Therefore, the current calibration mode of the full-flow penetrometer is often not accurate enough when facing a small measuring range.
Disclosure of utility model
The utility model aims to overcome the defects in the prior art, and provides a penetrometer calibration device which can load the penetrometer step by step to realize the relationship between the resistance and the strain of the probe end of the low-range calibration penetrometer.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
the utility model provides a penetrometer calibration device, comprising:
a support module for supporting the penetrometer to remain upright;
The vertical loading module is used for applying vertical load to the stress end of the penetrometer step by step;
A stress-strain gauge disposed proximate a probe end of the penetrometer for measuring a stress-strain signal of the probe end when the vertical load is applied to the penetrometer;
The resistance metering module is used for measuring the actual loading value of the probe end;
And the data acquisition device is in signal connection with the stress strain gauge so as to acquire the stress strain signal.
Further, the vertical loading module comprises a weight and a load disc for bearing the weight, and the load disc is detachably connected with the stress end of the penetrometer.
Further, the loading disc is in threaded connection with the stress end of the penetrometer.
Further, the support module comprises a bracket and a fixed block, and the fixed block is fixedly connected to the bracket; the penetrometer penetrates through the fixed block and the bracket.
Further, the fixing block and the bracket are respectively provided with a through hole, and the penetrometer penetrates through the fixing block and the bracket through the through holes.
Further, the fixing block is fixed on the bracket through a positioning bolt.
Further, the hydraulic pressure control device also comprises a supporting cushion block, wherein the supporting cushion block is supported between the probe end of the penetrometer and the resistance metering module.
Further, the resistance metering module comprises an electronic scale.
Further, the system also comprises a computer, and the data collector is in signal connection with the computer.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model provides a penetrometer calibration device, comprising: a support module for supporting the penetrometer to remain upright; the vertical loading module is used for applying vertical load to the stress end of the penetrometer step by step; a stress-strain gauge disposed proximate to a probe end of the penetrometer for measuring a stress-strain signal of the probe end when the vertical load is applied to the penetrometer; a resistance metering module for measuring an actual load value of the probe end; and the data acquisition device is connected with the stress strain gauge signal and used for acquiring a stress strain signal of the probe end. The vertical loading module can be used for loading step by step according to the calibration requirement, the loading amount of each stage of loading can be selected according to the requirement of the calibration range, when the loading amount is smaller, the low-range calibration can be realized for the penetrometer by matching with the resistance metering module, for different vertical loads, a group of actual loading values and stress-strain signals can be correspondingly obtained respectively, and the accurate calibration of the relation between the resistance and the strain of the probe end of the penetrometer can be realized by establishing a relation equation of the actual loading values and the stress-strain signals.
Drawings
FIG. 1 is a schematic structural view of a penetrometer calibration device according to an embodiment of the utility model;
Fig. 2 is a straight line fitting diagram obtained by calibrating a penetrometer calibration device according to an embodiment of the utility model.
In the figure: 1-load disc, 2-support, 3-fixed block, 4-positioning bolt, 5-penetrometer, 6-stress strain gauge, 7-data acquisition unit, 8-computer, 9-electronic scale, 10-supporting cushion block, 11-weight.
Detailed Description
The present utility model is described in detail below with reference to the drawings and specific embodiments thereof, wherein like reference numerals designate like or similar parts or portions, and wherein it will be understood by those skilled in the art that the drawings are not necessarily drawn to scale. The embodiments of the present utility model and specific features in the embodiments are detailed descriptions of the technical solutions of the present utility model, but not limited to the technical solutions of the present utility model, and the embodiments and technical features in the embodiments of the present utility model may be combined with each other without conflict.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Example 1:
As shown in fig. 1, an embodiment of the present utility model provides a penetrometer calibration device, which includes a support module, a vertical loading module, a stress foil gauge 6, a resistance measurement module and a data collector 7.
The supporting module is used for supporting the penetrometer 5 to keep a vertical state, and specifically may include a bracket 2 and a fixing block 3, where the fixing block 3 is fixedly connected to the bracket 2. In the embodiment of the utility model, the fixing block 3 is fixed on the bracket 2 by adopting the two positioning bolts 4, the bracket 2 can be made of a metal material which is not easy to deform, the mechanical strength of the fixing module is ensured, the deformation of the supporting module in the test process is reduced, and the calibration precision is improved. Through holes are respectively arranged on the fixed block 3 and the bracket 2, and the size of the through holes is matched with the rod piece of the penetrometer 5, so that the penetrometer 5 is kept in a vertical state. During installation, the penetrometer 5 penetrates through the fixing block 3 and the bracket 2 through the through hole, and symmetrical transverse constraint force is applied to the penetrometer 5 to ensure stability of the penetrometer 5 in the test process, so that the penetrometer 5 is always kept in the vertical direction.
The vertical loading module is used for applying vertical load step by step to the stress end of the penetrometer 5. In some embodiments, the vertical loading module comprises a weight 11 and a load-carrying disc 1, the load-carrying disc 1 is used for carrying the weight 11, when the vertical loading module is installed and used, the load-carrying disc 1 is fixedly connected with the stress end of the penetrometer 5, and the weight 11 is preferably arranged at the corresponding position of the connection point of the load-carrying disc 1 and the penetrometer 5, so that the gravity of the weight 11 in the load-carrying disc 1 is fully applied to the stress end of the penetrometer 5 to form an effective vertical load. In an embodiment of the present utility model, the load plate 1 may be detachably secured to the load bearing end of the penetrometer 5 using threads. As an equivalent alternative, the load disc 1 and the stressed end of the penetrometer 5 may also use a mortise and tenon structure. The weights 11 can be configured with a plurality of weights, the weight specification of the weights 11 can be selected according to the requirement of the calibration range, the weights 11 are placed on the loading tray 1 step by step, and then vertical load can be applied to the stress end of the penetrometer 5 step by step. It can be understood that when the weight 11 is of a smaller weight specification, a lower vertical load can be applied to the stress end of the penetrometer 5, so that the resistance of the probe end of the penetrometer 5 is smaller, the calibration range is reduced, and the precise calibration of the penetrometer 5 in the low-range is realized.
The stress foil gauge 6 is used for collecting the strain amount of the penetrometer 5 in the calibration process, and in the embodiment of the utility model, the stress foil gauge 6 is stuck at a position close to the probe end of the penetrometer 5 and is used for collecting stress foil signals for measuring the probe end of the penetrometer 5 when the weight 11 applies a vertical load to the penetrometer 5.
The data acquisition device 7 is in signal connection with the stress strain gauge 6 and is used for acquiring stress strain signals of the probe end of the penetration meter 5. In the embodiment of the utility model, the stress foil gage 6 is connected with the data collector 7 through a wire, one end of the wire is connected with the signal output end of the stress foil gage 6, and the other end of the wire can pass through the inside of the penetrometer 5 and pass out from the stress end of the penetrometer 5 to be connected with the data collector 7.
The resistance measuring module is arranged below the probe end of the penetrometer 5 and is used for measuring the actual loading value of the probe end of the penetrometer 5 in the calibration process, namely the resistance value born by the probe end. A supporting cushion block 10 is arranged between the probe end of the penetrometer 5 and the resistance metering module, the supporting cushion block 10 has a supporting effect on the penetrometer 5, and meanwhile, the condition that a rod piece of the penetrometer 5 extending below the support 2 is not too long is ensured, and unstable damage of the rod piece in the calibration process is avoided.
The resistance metering module may select a corresponding weighing range according to an actual measuring range of the penetrometer 5, and the actual load size of the probe end of the penetrometer 5 may be required to be accurately obtained.
The penetrometer calibration device of the embodiment of the utility model further comprises a computer 8, the data acquisition device 7 is in signal connection with the computer 8, the data acquisition device transmits stress strain signals (usually voltage signals) output by the acquired stress strain gauges 6 under different vertical loads to the computer 8, and the computer 8 simultaneously records actual load values of the probe ends of the penetrometer 5 measured by the resistance measurement module under corresponding vertical loads.
The following describes the calibration method of the penetrometer calibration device provided in this embodiment in further detail, including the following steps:
Zeroing the electronic scale 9;
A weight 11 is placed in the loading disc 1 step by step, the indication of the electronic scale 9 of each stage and the voltage value output by the stress strain gauge 6 acquired by the data acquisition device 7 are recorded, and the indication of the electronic scale 9 is the actual loading value of the probe end of the penetrometer 5;
As shown in fig. 2, all the recorded data are input into a computer 8, the computer 8 carries out linear fitting of y=ax+b on an actual load value y of the probe end of the penetrometer 5 and a voltage value x output by the stress foil 6 through a regression formula, and values of parameters a and b are calculated, so that the calibration of the relation between the resistance and the strain of the probe end of the penetrometer 5 is realized.
According to the penetrometer calibration device provided by the embodiment, the vertical loading module can be used for loading step by step according to the calibration requirement, the loading amount of each stage of loading can be selected according to the requirement of the calibration range, when the loading amount is smaller, the relationship between the resistance and the strain of the probe end of the low-range calibration penetrometer can be realized by matching with the resistance metering module, for different vertical loads, a group of actual loading values and stress-strain signals can be respectively and correspondingly obtained, and the accurate calibration of the penetrometer can be realized by establishing a relationship equation of the actual loading values and the stress-strain signals. Meanwhile, the calibrating device provided by the embodiment is high in universality, is not only suitable for calibrating the T-shaped penetrometer, the spherical penetrometer and other penetrometers, but also can be applied to small-range calibration of the strain sensors of all the slender rods.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present utility model, and these improvements and modifications should also be considered as the scope of the present disclosure/the present utility model.
Claims (9)
1. An penetrometer calibration device, comprising:
a support module for supporting the penetrometer to remain upright;
The vertical loading module is used for applying vertical load to the stress end of the penetrometer step by step;
A stress strain gauge (6) disposed proximate to a probe end of the penetrometer for measuring a stress-strain signal of the probe end when the vertical load is applied to the penetrometer;
The resistance metering module is used for measuring the actual loading value of the probe end;
And the data acquisition device (7) is in signal connection with the stress strain gauge (6) so as to acquire the stress strain signal.
2. The penetrometer calibration device according to claim 1, characterized in that the vertical loading module comprises a weight (11) and a load tray (1) for carrying the weight (11), the load tray (1) being detachably connected with the force-receiving end of the penetrometer.
3. Penetrometer calibration device according to claim 2, characterized in that the load disc (1) is screwed with the force-bearing end of the penetrometer.
4. The penetrometer calibration device according to claim 1, wherein the support module comprises a bracket (2) and a fixed block (3), the fixed block (3) being fixedly connected to the bracket (2); the penetrometer penetrates through the fixed block (3) and the bracket (2).
5. The penetrometer calibration device according to claim 4, wherein the fixing block (3) and the bracket (2) are respectively provided with a through hole, and the penetrometer penetrates through the fixing block (3) and the bracket (2) through the through holes.
6. Penetrometer calibration device according to claim 4 or 5, characterized in that the fixing block (3) is fixed to the bracket (2) by means of a positioning bolt (4).
7. The penetrometer calibration device of claim 1, further comprising a support pad (10), the support pad (10) being supported between a probe end of the penetrometer and the resistance metering module.
8. The penetrometer calibration device of claim 1 wherein the resistance gauge module comprises an electronic scale.
9. The penetrometer calibration device according to claim 1, further comprising a computer (8), wherein the data collector (7) is in signal connection with the computer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323506968.5U CN221550355U (en) | 2023-12-22 | 2023-12-22 | Penetrometer calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323506968.5U CN221550355U (en) | 2023-12-22 | 2023-12-22 | Penetrometer calibration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221550355U true CN221550355U (en) | 2024-08-16 |
Family
ID=92227746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323506968.5U Active CN221550355U (en) | 2023-12-22 | 2023-12-22 | Penetrometer calibration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221550355U (en) |
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2023
- 2023-12-22 CN CN202323506968.5U patent/CN221550355U/en active Active
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