CN203249733U - Hydraulic indicator error checking device - Google Patents

Abstract

The utility model belongs to the technical field of detection, and relates to a hydraulic indicator error checking device. The checking device is composed of a touch screen, a programmable logic controller, an A/D conversion module, an analog sensor circuit board, a power supply module and a special potentiometer. According to the hydraulic indicator error checking device of the utility model, modular design is adopted, and therefore, the detection of one kind of hydraulic indicator can be completed through adopting a single device, which satisfies a use requirement of a user. The connection of a tested product is simple and convenient. A man-machine interface is friendly; the touch screen can be adopted as an operation interface and a display interface without a complexly-designed mechanical button circuit required. According to indication error principles of a tested product, and with the programmable logic controller and the A/D conversion module adopted, the indication errors of the tested product can be automatically calculated, and the indication errors are displayed through the touch screen, and therefore, errors in a manual recording process and a manual conversion process can be avoided, and work efficiency can be improved.

Description

Error checking device for hydraulic indicator

Technical Field

The utility model belongs to the technical field of detect, a hydraulic indicator error inspection device is related to.

Background

The test method and the test efficiency of the aviation hydraulic indicator series products of enterprises are not suitable for the requirements of modern production.

The existing hydraulic indicator test adopts an adjustable alternating current power supply to supply power to a product, and is connected with resistors R1 and R2 of an analog sensor, and two resistor boxes R (X) and R (Y) are connected to the outside, as shown in figure 1. When the bridge is balanced, under the condition that the resistance values of the two resistance boxes are kept unchanged, one resistance box is increased, and the other resistance box is decreased, so that the bridge is balanced. Because the resistance box can not be adjusted continuously, the bridge can be balanced after being adjusted for many times. After the resistance values of the two resistance boxes are read manually, the error of the indicator is obtained by checking the error corresponding table according to the two resistance values. The whole error checking process is complicated, misoperation is easily caused, and the measurement precision is influenced.

Disclosure of Invention

The utility model aims at: the error checking device for the hydraulic indicator is high in testing accuracy, simple and convenient to operate and capable of automatically interpreting errors.

The technical solution of the utility model is that:

the error checking device for hydraulic indicator consists of touch screen, programmable logic controller, A/D conversion module, analog sensor circuit board, power supply module and special potentiometer. Wherein,

the test circuit consists of a tested hydraulic indicator, a power supply module, an analog sensor circuit board and a special potentiometer, wherein the special potentiometer is connected to two bridge arms of an electric bridge of the hydraulic indicator;

the error interpretation circuit consists of a touch screen, a programmable logic controller, an A/D conversion module, an analog sensor circuit board, a power supply module and a special potentiometer, wherein the A/D conversion module acquires a voltage signal of a center head of the potentiometer and transmits the voltage signal to the programmable logic controller;

the touch screen, the programmable logic controller and the analog sensor circuit board are used for controlling the switching of the test circuit and the error interpretation circuit;

the special potentiometer is a precise multi-circle variable resistor.

The technical effects of the utility model are that:

the utility model discloses a user operation requirement that 2 hydraulic indicator tests were accomplished to a hydraulic indicator error inspection device has convenient operation, can the characteristics of direct display error.

The error checking device of the hydraulic indicator does not need a separate power supply, a resistor box, a change-over switch and other equipment, the error checking of the hydraulic indicator is finished through the programmable logic controller, the A/D conversion module, the special potentiometer and the touch screen, the traditional method of manually recording and converting the table look-up and indicating errors is replaced, the testing precision is ensured, and the testing efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of an original measurement circuit.

Fig. 2 is a schematic circuit diagram of the present invention.

Fig. 3 is a schematic block diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to fig. 3.

The error checking device for hydraulic indicator consists of touch screen, programmable logic controller, A/D conversion module, analog sensor circuit board, power supply module and special potentiometer. Wherein,

the test circuit consists of a tested hydraulic indicator, a power supply module, an analog sensor circuit board and a special potentiometer, wherein the special potentiometer is connected to two bridge arms of an electric bridge of the hydraulic indicator;

the error interpretation circuit consists of a touch screen, a programmable logic controller, an A/D conversion module, an analog sensor circuit board, a power supply module and a special potentiometer, wherein the A/D conversion module acquires a voltage signal of a center head of the potentiometer and transmits the voltage signal to the programmable logic controller;

the touch screen, the programmable logic controller and the analog sensor circuit board are used for controlling the switching of the test circuit and the error interpretation circuit;

the special potentiometer is a precise multi-circle variable resistor. The total value of the variable resistor is the same as the sum of the resistance values of the resistor boxes in the original measuring method, namely, the two original resistor boxes R (X) and R (Y) are replaced, as shown in figure 2.

The utility model discloses a use method as follows:

firstly, the error checking device and the tested hydraulic indicator are connected through a cable, and the tested hydraulic indicator is connected to the analog sensor by clicking the corresponding control error checking device on the touch screen. If the indicator bridge is not balanced, the special potentiometer is connected to two bridge arms of the bridge of the hydraulic indicator through selection of the touch screen control, and a test circuit is formed. And the bridge of the hydraulic indicator is balanced by adjusting the knob of the potentiometer.

Then clicking an error control on the touch screen to cut off the connection between the measured hydraulic indicator and the analog sensor circuit and the power supply module, and forming an error interpretation circuit by the touch screen, the programmable logic controller, the A/D conversion module, the analog sensor circuit board, the power supply module and the special potentiometer. The A/D conversion module collects voltage signals of a potentiometer center head and transmits the voltage signals to the programmable logic controller, and the programmable logic controller converts indication errors of the indicator based on a hydraulic indicator error calculation principle and displays the indication errors through the touch screen.

Example 1:

the touch screen is of a desktop 74S211 type, the programmable logic controller is of a Mitsubishi FX3U-48M type, the A/D conversion module is of a Mitsubishi FX3U-4A/D type, and the power supply module is a 4NIC-8Q sunward power supply module.

Claims (2)

1. Hydraulic pressure indicator error inspection device, characterized by: the device consists of a touch screen, a programmable logic controller, an A/D conversion module, an analog sensor circuit board, a power supply module and a special potentiometer; wherein,

the test circuit consists of a tested hydraulic indicator, a power supply module, an analog sensor circuit board and a special potentiometer, wherein the special potentiometer is connected to two bridge arms of an electric bridge of the hydraulic indicator;

the error interpretation circuit consists of a touch screen, a programmable logic controller, an A/D conversion module, an analog sensor circuit board, a power supply module and a special potentiometer, wherein the A/D conversion module acquires a voltage signal of a center head of the potentiometer and transmits the voltage signal to the programmable logic controller;

the touch screen, the programmable logic controller and the analog sensor circuit board are used for controlling the switching of the test circuit and the error interpretation circuit.

2. The hydraulic indicator error checking device according to claim 1, wherein: the special potentiometer is a precise multi-circle variable resistor.

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