CN205561797U - Device is checked to displacement meter demarcation - strainometer - Google Patents

Abstract

A displacement gauge calibration-strain gauge checking device, including a base plate, on which three left, middle and right columns are installed; wherein, the middle and right columns are respectively provided with through holes, and the axis lines of the two through holes are located on the same straight line On the top, the displacement gauge or transmission rod passes through the through hole on the center column, and is locked by the first screw rod at the upper end of the center column; the digital display micrometer or digital display dial gauge passes through the through hole on the right column, and passes through the right column The second screw at the upper end is locked, wherein the displacement gauge and the digital display micrometer are in direct contact with each other in the working state, the transmission rod is in direct contact with the digital display dial gauge in the working state, and the transmission rod is in the process of strain gauge calibration Connect with the strain gauge fixed installation mechanism. The utility model provides a displacement gauge calibration-strain gauge checking device, which can not only calibrate the sensitivity coefficients of displacement gauges with different ranges, but also adjust the Different gauge length bow strain gauges are used for calibration.

Description

A Displacement Gauge Calibration-Strain Gauge Calibration Device

technical field

The utility model relates to the detection field of displacement and strain monitoring sensors, in particular to a displacement gauge calibration-strain gauge checking device.

Background technique

In civil engineering tests or engineering inspections, it is often necessary to obtain information such as displacement and strain of stressed components to evaluate their mechanical properties or stressed states. At present, a new type of displacement and strain monitoring sensor——displacement gauge and strain gauge are gradually being widely used due to their advantages of convenient reading and reusability. Generally speaking, this type of sensor has been tested and calibrated at the beginning of the factory, and the production unit has given the initial sensitivity coefficient, but after a long time, multiple times or use in harsh environments, some parts of the sensor are aging and damaged. As a result, the displacement or strain calculated by the original sensitivity coefficient is no longer true, and the sensitivity coefficient of connecting different instruments changes. In order to obtain the real mechanical information such as displacement and strain of the stressed member, the sensor needs to be re-calibrated before further use, and its latest sensitivity coefficient is measured for calculation. Therefore, it is of practical significance to design a displacement gauge and strain gauge calibration device that is easy to operate and has a certain degree of accuracy guarantee for obtaining test and detection data.

Contents of the invention

The technical problem to be solved by the utility model is to provide a displacement gauge calibration-strain gauge checking device, which can conveniently measure the sensitivity coefficients of displacement gauges and strain gauges, so as to obtain real detection data.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A displacement gauge calibration-strain gauge checking device, comprising a base plate, on which a left column, a middle column and a right column are installed; wherein, the center column and the right column are respectively provided with a first through hole, a second Two through holes, the axis lines of the first through hole and the second through hole are on the same straight line, the displacement gauge or transmission rod passes through the first through hole on the center column, and is locked by the first screw rod at the upper end of the center column; digital display The micrometer or digital display dial indicator passes through the second through hole on the right column, and is locked by the second screw rod at the upper end of the right column. It is in direct contact with the digital display dial indicator in the working state, and the transmission rod is connected with the strain gauge fixed installation mechanism during the strain gauge check.

The fixed installation mechanism of the strain gauge includes a mounting plate, one end of the mounting plate is locked by the bolt on the left column, and the other end is installed in the groove of the center column; the mounting plate is provided with a chute, and the strain gauge is connected to the transmission rod , and both ends are set in the chute through the screw rod and locked by the nut.

A worm gear is arranged on the central column, and the transmission rod has teeth meshing with the worm gear.

The transmission rod includes a rod body and a connecting seat.

The strain gauge is a bow-shaped strain gauge, and one end of the bow-shaped strain gauge is provided with a connecting hole and the other end is provided with a U-shaped groove.

The utility model is a displacement gauge calibration-strain gauge checking device, which has the following technical effects:

1) By setting the bottom plate, left column, middle column and right column, using the through holes and locking mechanisms on each column, it is possible to calibrate the sensitivity coefficients of displacement meters with different ranges, and to calibrate the bow strain gauges with different gauge lengths. proofreading.

2) The concept of calibrating the bow strain gauge by using the displacement control method is more intuitive than the force control method.

3) After repeated or long-term use of displacement gauges and strain gauges, the original parts will be deformed and aged. Use this device to calibrate the displacement gauges and check the strain gauges before the test. It is of great significance to reduce the experimental error and obtain reliable experimental data.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is a schematic diagram of the structure of the utility model (displacement gauge calibration).

Fig. 2 is a schematic diagram of the structure of the utility model (strain gauge check).

Fig. 3 is a schematic diagram of the transmission rod of the present invention.

Fig. 4 is a schematic diagram of the strain gauge of the present invention.

Fig. 5 is a schematic diagram of the mounting plate of the present invention.

Fig. 6 is a sectional view of the utility model (displacement gauge calibration).

Fig. 7 is a sectional view of the utility model (strain gauge check).

In the figure: bottom plate 1, left column 2, middle column 3, right column 4, connecting seat 5, first through hole 6, second through hole 7, displacement meter 8, transmission rod 9, first screw rod 10, digital display Micrometer 11, digital display dial indicator 12, second screw rod 13, strain gauge fixed installation mechanism 14, mounting plate 15, bolt 16, groove 17, chute 18, strain gauge 19, worm wheel 20, rod body 21.

detailed description

As shown in Figure 1-2 or Figure 6-7, a displacement gauge calibration-strain gauge checking device includes a base plate 1 on which a left column 2, a center column 3 and a right column 4 are installed; wherein, the center column 3 and the right column 4 are respectively provided with a first through hole 6 and a second through hole 7 along the length direction of the bottom plate 1. The axis lines of the first through hole 6 and the second through hole 7 are located on the same straight line, and the displacement gauge 8 or The transmission rod 9 passes through the first through hole 6 on the center column 3, and is locked by the first screw rod 10 on the upper end of the center column 3; Two through holes 7 are locked by the second screw rod 13 on the upper end of the right column 4, wherein the displacement gauge 8 and the digital display micrometer 11 are in direct contact with each other in the working state, and the transmission rod 9 and the digital display dial gauge 12 are in the working state Directly facing the contact, and the transmission rod 9 is connected with the strain gauge fixed installation mechanism 14 in doing the strain gauge calibration.

As shown in Figure 2, the fixed installation mechanism 14 of the strain gauge includes a mounting plate 15, one end of the mounting plate 15 is locked by the bolt 16 on the left column 2, and the other end is installed in the groove 17 of the center column 3; A chute 18 is arranged on the plate 15, and the strain gauge 19 is connected with the transmission rod 9, and both ends are arranged in the chute 18 through a screw rod and locked by nuts.

As shown in FIG. 2 , a worm gear 20 is arranged on the center column 3 , and the transmission rod 9 has teeth meshing with the worm gear 20 on the vehicle. By manually rotating the worm gear, the transmission rod can be driven, thereby controlling the moving direction of the transmission rod.

As shown in FIG. 3 , the transmission rod 9 includes a rod body 21 and a connecting seat 5 .

As shown in FIG. 4 , the strain gauge 19 is a bow-shaped strain gauge, and one end of the bow-shaped strain gauge is provided with a connecting hole and the other end is provided with a U-shaped groove.

Displacement gauge calibration process:

1), installation and positioning, pass the measuring rod of the displacement meter 8 through the first through hole 6 of the center column 3, tighten the upper first screw 10 to fix the displacement meter 8, and pass the measuring rod of the digital display micrometer 11 through the right column The second through hole 7 of 4, tighten the second screw rod 13 on the upper part to fix the digital display micrometer 11, make the measuring rod of the digital display micrometer 11 contact with the measuring rod of the displacement meter 8, and then connect the wire of the displacement meter 8 to On the acquisition instrument, the readings of the acquisition instrument and the digital display micrometer 11 are cleared.

2) For formal calibration, rotate the measuring rod of the digital display micrometer 11 successively to make the displacement reach the preset displacement value, use the acquisition instrument to collect the strain under the displacement, and end a calibration test after reaching the displacement set value. The level preset displacement value and the corresponding strain value are fitted, and the sensitivity coefficient of the displacement meter 8 is obtained.

Strain gauge calibration process:

1), installation and positioning, one end of the installation plate 15 is stuck in the groove 17 of the center column 3, and the other end is fixed on the top surface of the left column 2 with a bolt 16, and the rod body 21 of the transmission rod 9 passes through the center column 3 The first through hole 6, and then the transmission rod 9 and the strain gauge 19 are fixed on the mounting plate 15 with bolts; according to the cylindrical position of the transmission rod 9, a suitable round hole on the bottom plate 1 is selected to ensure that the strain gauge is under tension or compression. In the limit state, the end of the cylinder is always in close contact with the pointer of the digital display dial indicator 12, the right column 4 is fixed on the bottom plate 1, and the digital display dial indicator 12 is used, and the second screw rod 13 is fixed on the right column 4; Connect the strain gauge 19 to the acquisition instrument, and clear the readings of the acquisition instrument and the digital display dial gauge 6 to zero.

2) Formal calibration, when performing tension or pressure calibration, fine-tune the worm gear 20 along the direction of strain gauge 19 under tension or compression, so that strain gauge 19 moves to the preset displacement values of each level, and collect the strain under each displacement The sensitivity coefficient of the strain gauge 19 can be obtained by fitting the theoretical strain value (the ratio of the actual displacement to the gauge length of the strain gauge) and the collected strain value.

Claims (5)

1. displacement meter calibration-strain gauge capacity checking device, it is characterised in that: include base plate (1), base plate (1) is provided with left column (2), central post (3) and right column (4)；Wherein, on central post (3) and right column (4), it is respectively equipped with the first through hole (6), the second through hole (7) along base plate (1) length direction, first through hole (6) and the second through hole (7) axial line are located along the same line, displacement meter (8) or drive link (9), through the first through hole (6) on central post (3), are locked by first screw rod (10) of central post (3) upper end；Digital display micrometer (11) or digital display dial gauge (12) are through the second through hole (7) on right column (4), locked by second screw rod (13) of right column (4) upper end, wherein, displacement meter (8) is with digital display micrometer (11) the most just to contacting, and drive link (9) and digital display dial gauge (12) are the most just to contacting and drive link (9) is connected with strain gauge fixed installation sector (14) doing during strain gauge is checked.

A kind of displacement meter calibration-strain gauge capacity checking device the most according to claim 1, it is characterized in that: described strain gauge fixed installation sector (14) includes installing plate (15), installing plate (15) one end is locked by the bolt (16) on left column (2), the other end is arranged in the groove (17) of central post (3)；Described installing plate (15) is provided with chute (18), and strain gauge (19) is connected with drive link (9), and two ends are arranged in chute (18) by screw rod and pass through nut check.

A kind of displacement meter calibration-strain gauge capacity checking device the most according to claim 1, it is characterised in that: described central post (3) is provided with worm gear (20), and drive link (9) is got on the bus the tooth engaged with worm gear (20).

A kind of displacement meter calibration-strain gauge capacity checking device the most according to claim 1, it is characterised in that: described drive link (9) includes rod member main body (21) and connects seat (5).

A kind of displacement meter calibration-strain gauge capacity checking device the most according to claim 2, it is characterised in that: described strain gauge (19) is arch strain gauge, and arch strain gauge one end has connecting hole, the other end has u-shaped groove.