CN213090679U - Strain signal adjusting box - Google Patents

Abstract

The utility model relates to a strain signal conditioning box, which comprises a box body, wherein the front side of the box body is provided with a 27 channel and a switch, and the back side of the box body is provided with a power interface, an input interface and an output interface; the method is characterized in that a full-bridge strain gage is zeroed, a bridge plate resistor is excited, a linear voltage stabilizing chip is adopted for supplying power to the bridge plate, power input is provided for the linear voltage stabilizing chip through an AC-DC conversion device, and power is provided for 27 channels through the AC-DC chip; half of the full bridge is used for exciting the bridge piece, and the other half of the full bridge is used for zeroing. And the 27 channels are zeroed by adopting knobs, the knobs are connected with multi-ring potentiometers, and the multi-ring potentiometers are connected with isolation amplifiers for resistance isolation. The utility model has the advantages that, realized the automation completely, convenient and fast has improved the zero setting precision.

Description

Strain signal adjusting box

Technical Field

The utility model belongs to the technical field of the signal conditioner, concretely relates to signal of meeting an emergency regulation case.

Background

The main function of the signal conditioner is to receive the signal and convert it into a higher level electrical signal; signal conversion is commonly used for industrial applications using a variety of sensors for measurements; because the sensors used are different, the signals which need to be converted into signals which can be used by the connected equipment need to be converted into standard process signals; the resistance strain gauge is used for measuring the load bearing condition of an object; the fixing of the initial zero position has important significance for reading actual measurement data under the influence of factors such as individual operation differences of resistance strain gauges, transmission line loss, temperature drift and the like. But the degree of automation of current strain signal regulation case is low, and it is not convenient enough to use, and the precision is lower simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the above problem, providing a strain signal adjusts case, realized the automation completely, convenient and fast has improved the zero setting precision.

In order to achieve the above object, the utility model provides a following technical scheme:

a strain signal conditioning box comprises a box body, wherein the front surface of the box body is provided with 27 channels and a switch, and the back surface of the box body is provided with a power supply interface, an input interface and an output interface;

the method is characterized in that a full-bridge strain gage is zeroed, a bridge plate resistor is excited, a linear voltage stabilizing chip is adopted for supplying power to the bridge plate, power input is provided for the linear voltage stabilizing chip through an AC-DC conversion device, and power is provided for 27 channels through the AC-DC chip; half of the full bridge is used for exciting the bridge piece, and the other half of the full bridge is used for zeroing.

Further, the 27 channels are zeroed by adopting knobs, the knobs are connected with multi-circle potentiometers, and the multi-circle potentiometers are connected with isolation amplifiers for resistance isolation.

Furthermore, the power interface is externally connected with an AC220V power supply, and the AC220V power supply adopts a universal 10A three-core socket with a fuse.

Further, the interface form of the bridge excitation is 7-core aerial plug, 6 cores are used for 3 channels in each aerial plug, and 1 core is used for shielding.

Further, the bridge piece voltage output interface is in the form of 7-core aerial plugs, 6 cores of each aerial plug are used for 3 channels, and 1 core of each aerial plug is used for shielding.

Furthermore, the bridge adjusting range is 120-170 omega, and the zero setting range is less than or equal to 10 mV.

Further, the bridge sheet resistance excitation voltage is 6V +/-3%.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses signal conditioning case meets an emergency is 27 passageways, 120 omega, 1/4 bridge signal conditioning case. Zero setting design is carried out aiming at the full-bridge strain gauge, the resistance of the bridge plate is excited, and the voltage of the bridge plate can be output. The index requirements are realized in the aspects of performance, structure, environmental adaptability and the like. The power supply voltage of the bridge is 9VDC, and each path of bridge voltage is DC/DC to independently supply power; bridge adjusting range: 120-170 omega; the signal adjusting box for zero adjustment of the 27-path full-bridge strain gauge completely realizes automation, is convenient and fast, and improves the zero adjustment precision.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the description of the embodiment will be briefly introduced below, it is obvious that the drawings in the following description are only for more clearly illustrating the embodiment of the present invention or the technical solution in the prior art, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic front structural view of the present invention;

fig. 2 is a schematic view of the back structure of the present invention;

fig. 3 is a schematic top view of the present invention;

fig. 4 is a schematic side view of the present invention;

in the figure: 1-27 channels, 2-switches, 3-power supply interface, 4-input interface, 5-output interface and 6-box body.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described with reference to the following specific embodiments, which are provided as illustration only and are not intended to limit the present invention.

The strain signal conditioning box shown in fig. 1-4 comprises a box body 6, wherein the front surface of the box body 6 is provided with 27 channels 1 and a switch 2, and the back surface of the box body 6 is provided with a power interface 3, an input interface 4 and an output interface 5.

The utility model discloses signal conditioning case meets an emergency is 27 passageway 120 omega, 1/4 bridge signal conditioning case. Zero setting design is carried out aiming at the full-bridge strain gauge, the resistance of the bridge plate is excited, and the voltage of the bridge plate can be output. The index requirements are realized in the aspects of performance, structure, environmental adaptability and the like. The power supply voltage of the bridge is 9VDC, and each path of bridge voltage is DC/DC to independently supply power; bridge adjusting range: 120 omega to 170 omega.

The utility model discloses to the operation requirement of power than higher, need provide 6V's excitation, all have the requirement to the precision and the ripple of voltage simultaneously, so will use linear steady voltage chip to produce to the power supply of bridge piece. The external incoming voltage is AC220, so there is an AC-DC conversion to provide input to the linear regulator chip, and the power supply to the AC-DC conversion device is relatively clean. Therefore, an AC-DC chip is required inside the product to supply power to all channels, and a linear regulator chip is used for supplying power to the bridge chip for each channel.

Because of the use of knobs, the best way is to use multi-turn potentiometers. Half of the full bridge is used to excite the bridge pieces and the other half is used to zero. If the potentiometer is directly connected to the zero half bridge, the resistance of the potentiometer will inevitably affect the zero setting, and therefore isolation is required. The scheme adopts an isolation amplifier, and generally adopts the isolation high direct current level of equipment when small alternating current or differential signals pass through.

The operational amplifier is used in a follower mode, and the requirements of the operational amplifier are to withstand 6V and be rail-to-rail IO.

The input of the operational amplifier is the voltage divided by the potentiometer, and the output end is connected to the zero-setting half bridge through the zero-setting resistor, so that the bridge circuit is not influenced.

The technical points are as follows:

the external AC220V power supply uses a universal 10A three-core socket with a fuse;

the channel is zeroed by using a knob;

the interface form of the bridge piece excitation is 7-core aerial plug, 6 cores of each aerial plug are used for 3 channels, and 1 core is used for shielding;

the voltage output interface of the bridge plate is in the form of 7-core aerial plug, 6 cores of each aerial plug are used for 3 channels, and 1 core is used for shielding.

The detection method comprises the following steps:

1. channel zeroing

The port testing tool is used for connecting the input port and the output port, the front panel is adjusted to correspond to the channel potentiometer, and the corresponding channel can be adjusted to be 0mV through multimeter mV grade observation.

2. Consistency detection

And (4) detecting that the maximum value and the minimum value of each channel are in the same magnitude range without adjusting a port test tool.

The consistency of the adjustment direction was observed for all channels. For example: all channels are adjusted to the left, increasing from the multimeter display value, and to the right, decreasing values.

The present invention is not described in detail in the prior art.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A strain signal conditioning box comprises a box body (6), and is characterized in that the front surface of the box body (6) is provided with 27 channels (1) and a switch (2), and the back surface of the box body is provided with a power interface (3), an input interface (4) and an output interface (5);

the method is characterized in that the method is used for zeroing a full-bridge strain gage and exciting a resistance of the bridge plate, a linear voltage stabilizing chip is used for supplying power to the bridge plate, power input is provided for the linear voltage stabilizing chip through an AC-DC conversion device, and power is provided for a 27 channel (1) through the AC-DC chip; half of the full bridge is used for exciting the bridge piece, and the other half of the full bridge is used for zeroing.

2. The strain signal conditioning box according to claim 1, wherein the 27 channels (1) are zeroed by a knob, the knob is connected with a multi-turn potentiometer, and the multi-turn potentiometer is connected with an isolation amplifier for resistance isolation.

3. The strain signal conditioning box according to claim 1, wherein the power interface (3) is externally connected with an AC220V power supply.

4. The strain signal conditioning cabinet of claim 3, wherein the AC220V power supply is a universal 10A three-wire outlet with a fuse.

5. A strain signal conditioning box according to claim 1, wherein the bridge piece excitation interface is in the form of 7-core interposers, 6 cores for 3 channels each and 1 core for shielding.

6. A strain signal conditioning box according to claim 1, wherein the patch voltage output interface is in the form of a 7-core aerial pod, 6 cores for 3 channels each, and 1 core for shielding.

7. The strain signal conditioning box of claim 1, wherein the bridge has a tuning range of 120 Ω -170 Ω and a zero tuning range of 10mV or less.

8. A strain signal conditioning box according to any one of claims 1 to 7, wherein the bridge sheet resistance excitation voltage is 6V ± 3%.

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