CN211042539U - Testing device - Google Patents

Abstract

The utility model provides a testing arrangement, testing arrangement is used for testing the thermocouple fastener, testing arrangement includes: the input device is used for inputting a first temperature parameter; the conversion device comprises a comparator and a signal module, the comparator is connected with the input device, the comparator stores a known comparison table, the comparison table comprises a plurality of input values and output values in one-to-one correspondence, the comparator is configured to receive a first temperature parameter with a temperature value as an input value from the input device, and obtain an output value corresponding to the temperature value of the first temperature parameter according to the comparison table, the signal module receives the output value and outputs a corresponding millivolt current signal for testing the thermocouple clamping piece, the signal module comprises an output channel, and the millivolt current signal is transmitted to a measuring channel of the thermocouple clamping piece through the output channel so as to test the thermocouple clamping piece. The utility model discloses a testing arrangement can accomplish the automatic test to the thermocouple fastener, and is nimble convenient, labour saving and time saving.

Description

Testing device

Technical Field

The utility model relates to a testing device.

Background

Thermocouples are very common temperature measuring elements in industrial production. The thermocouple can convert the temperature signal to a millivolt current signal. Based on the millivolt current signal, the temperature of the measured medium can be obtained according to a thermocouple graduation table. The table made from the corresponding relationship between the millivolt value and the temperature value of the millivolt current signal of the thermocouple is called a thermocouple score table. Different types of thermocouples have different thermocouple scores.

Commonly used thermocouples include standard thermocouples and non-standard thermocouples. The standard thermocouple refers to a thermocouple score table with unified standard, wherein the national standard specifies the relation and the allowable error of a millivolt current signal and a temperature value.

Thermocouple cards in distributed control systems utilize thermocouples at user equipment to measure the temperature of a measured medium, such as the vapor or liquid temperature in a pipe, the metal temperature, and the like. The thermocouple converts the temperature signal into a millivolt current signal, and the thermocouple clamping piece obtains the temperature of the measured medium according to the thermocouple dial gauge after receiving the millivolt current signal.

In a distributed control system, a control cabinet containing thermocouple blocks needs to be tested after manufacture, including testing of the thermocouple blocks. In the conventional testing method, a multimeter is usually used to generate a millivolt current signal, which is simulated by a thermocouple. The thermocouple clamping piece generates a temperature value according to the millivolt current signal, meanwhile, a thermocouple graduation meter is inquired, manual conversion is carried out, a temperature value corresponding to the millivolt current signal is obtained, the two temperature values are compared, and the measurement accuracy of the thermocouple clamping piece is analyzed. This test is complicated, time consuming and inconvenient.

A thermocouple cartridge typically has multiple measurement channels, such as 8 measurement channels. In practical use, each measuring channel is connected with a thermocouple for measuring the temperature of the medium at the position of the thermocouple. In a control cabinet, which mainly includes thermocouple blocks, there are usually 20 or more thermocouple blocks. That is to say more than, for example, 160 measurement channels need to be tested. With the existing testing approach, all channels need to be tested one by one. This often means a lot of repeated work, time and effort.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a testing arrangement. By using the testing device, the automatic testing of the thermocouple clamping piece can be rapidly completed.

In order to achieve the above object, the utility model provides a testing arrangement, testing arrangement is used for testing the thermocouple fastener, testing arrangement includes: an input device configured to input a first temperature parameter; the conversion device comprises a comparator and a signal module, wherein the comparator is connected with the input device, the comparator stores a known comparison table, the comparison table comprises a plurality of input values and output values in one-to-one correspondence, the comparator is configured to receive a first temperature parameter with a temperature value as an input value from the input device and obtain an output value corresponding to the temperature value of the first temperature parameter according to the comparison table, the signal module comprises an output channel, the signal module receives the output value and outputs a millivolt current signal which is used for testing the thermocouple clamping piece and has a millivolt value equal to the output value, and the millivolt current signal is transmitted to a measuring channel of the thermocouple clamping piece through the output channel so as to test the thermocouple clamping piece.

In the above mode, through the testing device, a millivolt current signal can be automatically generated according to the input first temperature parameter, the millivolt current signal generated by the thermocouple is simulated, the test on the thermocouple clamping piece is completed, and time and labor are saved.

In another exemplary embodiment of the device for testing a thermocouple clip, the output channel comprises two wires, the measuring channel of the thermocouple clip comprises a pair of terminals, and the two wires are respectively connected with the pair of terminals, so that the signal module and the measuring channel can form a closed loop.

In another exemplary embodiment of the electrical couple cartridge testing apparatus, the signal module includes a plurality of output channels corresponding to a plurality of measurement channels of the electrical couple cartridge, such that the signal module can be connected with the plurality of measurement channels to form a plurality of closed loops, respectively, and the signal module can transmit a millivolt current signal to each of the plurality of measurement channels.

In another exemplary embodiment of the electrical chuck testing device, the input device is configured to input a plurality of first temperature parameters in batches, the number of the plurality of first temperature parameters corresponding to the number of the plurality of output channels, and the converting device is configured to receive the plurality of first temperature parameters from the input device and output a corresponding number of the plurality of millivolt current signals.

In yet another exemplary embodiment of the apparatus for testing a thermocouple clip, the apparatus includes a data processing module, the data processing module is respectively connected to the input device and the thermocouple clip, the measurement channel of the thermocouple clip can generate a corresponding second temperature parameter according to the received millivolt current signal, and the data processing module is configured to collect the first temperature parameter and the corresponding second temperature parameter, and determine the measurement accuracy of the measurement channel of the thermocouple clip according to the collected first temperature parameter and the corresponding second temperature parameter.

In still another exemplary embodiment of the electric couple clamping piece testing device, the testing device comprises a display terminal, the display terminal is connected with the data processing module, the display terminal is provided with a display screen, and the display screen can display the temperature value of the first temperature parameter and the temperature value of the second temperature parameter input from the data processing module and the measurement precision of the measurement channel of the electric couple clamping piece.

In yet another exemplary embodiment of the electric couple card testing apparatus, the signal module includes a milliamp signal generator and a resistor having a resistance value of 1 ohm, the milliamp signal generator includes two output terminals, both ends of the resistor are connected with the two output terminals, respectively, the milliamp signal generator is configured to receive an output value and output a milliamp current signal having a milliamp value equal to the output value, and the two output terminals are connected with the two wires, respectively.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. In the drawings, similar components or features may have the same reference numerals. Wherein the content of the first and second substances,

fig. 1 schematically illustrates a testing device according to the present invention;

fig. 2 schematically illustrates a testing device comprising a data processing module and a terminal according to the present invention;

fig. 3 schematically illustrates a signal module according to the present invention.

Reference numerals

10 input device

20 switching device

22 comparator

24 signal module

242 output channel

2422A lead

244 milliamp signal generator

2442 output terminal

246 resistor

30 data processing module

40 display terminal

42 display screen

50 thermocouple fastener

52 measurement channel

millivolt value of mV

mA milliamp value

I input value

Output value of O

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thereby implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as needed. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to some examples may also be combined in other examples.

As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other definitions, whether explicit or implicit, may be included below. The definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.

Fig. 1 schematically shows a testing device according to the present invention. As shown in fig. 1, the test apparatus includes an input device 10 and a conversion device 20. The input device 10 can be used to input a value, which is a temperature value of the first temperature parameter.

As shown in fig. 1, the conversion apparatus 20 includes a comparator 22 and a signal module 24, and the signal module 24 includes a transmission channel 242. The comparator 22 stores a known comparison table, which includes a plurality of input values I and output values O in a one-to-one correspondence. The comparator 22 receives the first temperature parameter having the temperature value as the input value I from the input device 10, and obtains the output value O corresponding to the temperature value of the first temperature parameter from the comparison table.

In the comparison table described above, if the input value I represents a temperature value and the output value O represents a millivolt value, the comparison table is also referred to as a thermocouple score table, where the correspondence between the temperature value and the millivolt value depends on the type of thermocouple connected to the thermocouple cassette for measuring the temperature in actual operation, and different thermocouples have different thermocouple score tables. A common thermocouple connected to the thermocouple clip is a standard thermocouple. The standard thermocouple refers to a thermocouple of which the national standard specifies the relationship between the millivolt value and the temperature and has a uniform standard thermocouple score table. For example, the thermocouple to which the thermocouple clip is connected may be one of the standard thermocouples, i.e., a K-shaped thermocouple.

The comparator 22 receives the temperature value of the first temperature parameter from the input device 10, takes the temperature value as an input value I, finds an output value O corresponding to the input value I in the comparison table, and outputs the output value O to the signal module 24.

The signal module 24 receives the output value O and outputs a millivolt current signal having a millivolt value mV equal to the output value O, which is used to test the thermocouple fastener 50. As shown in fig. 1, the millivolt current signal is transmitted from the signal module 24 to the measurement channel 52 of the thermocouple cartridge 50 via the output channel 242 to test the measurement channel 52.

Correspondingly, the thermocouple fastener 50 stores therein a thermocouple graduation table, which includes a plurality of graduation table input values and graduation table output values in one-to-one correspondence, wherein the graduation table input values correspond to the output values O in the comparison table, and the graduation table input values correspond to the input values I in the comparison table. After the thermocouple fastener 50 receives the millivolt current signal, according to the millivolt value mV of the millivolt current signal, the output value of the graduation meter corresponding to the input value of the graduation meter equal to the millivolt value mV is found in the comparison table, and the temperature value equal to the output value of the graduation meter is input. As one aspect of the test of the measurement channel 52 of the thermocouple skid 50, the output temperature value is compared with the temperature value input by the input device 10, so that the test of the measurement accuracy of the measurement channel 52 of the thermocouple skid 50 can be completed.

To complete the test, the signal module 24 needs to form a closed loop with the test channel 52 of the thermocouple cartridge 50. To form a closed loop, the output channel 242 includes two wires 2422, as shown in fig. 1. The measurement channel 52 of the thermocouple clip 50 includes a pair of terminals (not shown). The two wires 2422 are connected to a pair of terminals respectively, so that the signal module 24 and the measurement channel 52 form a closed loop, and the measurement channel 52 can receive the millivolt current signal and perform a test.

The thermocouple cartridge 50 includes a plurality of measurement channels 52, for example, a typical thermocouple cartridge 50 has 8 measurement channels 52, and testing the thermocouple cartridge 50 requires testing all of its measurement channels 52. In an actual production process, if the testing device can simultaneously test all the measuring channels 52 of the thermocouple strip 50, the testing efficiency can be improved. As shown in fig. 1, in an embodiment of the present invention, the thermocouple fastener 50 includes a plurality of measurement channels 52, the signal module 24 includes a plurality of output channels 242 corresponding to the plurality of measurement channels 52 one-to-one, the plurality of output channels 242 are respectively connected to the plurality of measurement channels 52, so that the signal module 24 respectively forms a plurality of closed loops with the plurality of measurement channels 52, and the signal module 24 can respectively transmit a millivolt current signal to each of the plurality of measurement channels 52.

Alternatively, as shown in fig. 1, the conversion device 20 may include a plurality of signal modules 24. In this way, a plurality of signal modules 24 can simultaneously connect and test a corresponding number of a plurality of thermocouple clips 50. This embodiment enables a significant increase in test efficiency for the case where there are multiple thermocouple clamps 50 in one control cabinet.

Accordingly, in one embodiment of the present invention, the input device 10 is capable of inputting a plurality of first temperature parameters in batches. The number of first temperature parameters may be consistent with the number of output channels 242. Thus, during a test, after each input first temperature parameter is input into the converter 20, the signal module 24 can output a corresponding millivolt current signal through the output channel 242 to test the measurement channel 52 of the thermocouple card 50.

Batch input can be in a variety of ways. For example, a table of temperature values to be input may be prepared in advance, and then the input device 10 may take the values from the table in a predetermined order and transmit the values to the conversion device 20.

The signal module 24 may be a similar cartridge as the thermocouple cartridge 50, but the input signal and the output signal are of the same type as the thermocouple cartridge 50, i.e., for the measurement channel 52 of the thermocouple cartridge 50, a millivolt current signal is input and a temperature parameter is output; the signal module 24 inputs the temperature parameter and outputs the millivolt current signal.

The utility model discloses a testing arrangement in an embodiment includes data carding module 30, and data processing module 30 is connected with input device 10 and thermocouple fastener 50 respectively, and data processing module 30 gathers the first temperature parameter of input device 10 input and the second temperature parameter of measurement channel 52 output of thermocouple fastener 50 to confirm hot according to the value of the above-mentioned parameter of gatheringThe measurement accuracy of the measurement channel 52 of the galvanic couples cartridge 50. For example, if the temperature value of the first temperature parameter is t1 and the temperature value of the second temperature parameter is t2, the measurement accuracy is

If the measured measurement accuracy is not satisfactory, the corresponding measurement channel 52 may be calibrated to be satisfactory.

As shown in fig. 2, in one embodiment of the present invention, the testing device includes a display terminal 40, and the display terminal 40 has a display screen 42. The display terminal 40 receives the temperature value of the first temperature parameter, the temperature value of the second temperature parameter and the value of the measurement accuracy of the measurement channel 52 of the thermocouple fastener 50, which are input by the data processing module 30, and displays the values on the display screen 42 for reading and reference by the worker.

Of course, the data processing module 30 and the display terminal 40 can be matched to perform other information processing and displaying. For example, if the data processing module 30 does not collect millivolt current signals from one or more measurement channels 52 of the thermocouple cartridge 50, a signal may be output to the display terminal 40 such that the display terminal 40 displays an "error" at the corresponding measurement channel 52 displayed on the display screen 42, and may further display such as a red or flashing display. The "error" information may indicate, for example, that the corresponding measurement channel 52 of the thermocouple strip 50 is faulty, such as a wiring error, for reference by a worker.

Fig. 3 schematically shows a signaling module according to the present invention. As shown in fig. 3, the signal module 24 includes a milliamp signal generator 244 and a resistor 246, the milliamp signal generator 244 including two output terminals 2442. The milliamp signal generator 244 receives the output value O and outputs a milliamp current signal having a milliamp value mA equal to the output value O. The resistor 246 has a resistance value of 1 ohm, and both ends of the resistor 246 are connected to the two output terminals 2442, respectively. The two output terminals 2442 are connected to the two wires 2422, respectively.

According to the circuit principle, the milliamp signal generator 244 outputs a milliamp current signal of a milliamp value mA equal to the output value O, the milliamp current signal passes through the resistor 246 having a resistance value of 1 ohm, the both ends of the resistor 246 have a voltage of a millivolt value mV equal to the output value O, and the voltage of the both ends of the resistor 246 is equal to the voltage of the both output terminals. At this time, the signal module 24 transmits a millivolt voltage signal of millivolt value mV equal to the output value O through the output channel 242.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims (7)

1. Testing apparatus for testing a thermocouple fastener (50), the testing apparatus comprising:

an input device (10) configured to input a first temperature parameter;

a conversion arrangement (20) comprising a comparator (22) and a signal module (24), wherein,

the comparator is connected with the input device, the comparator stores a known comparison table, the comparison table comprises a plurality of input values (I) and output values (O) which correspond to each other one by one, the comparator is configured to receive a first temperature parameter with a temperature value as an input value (I) from the input device and obtain an output value (O) corresponding to the temperature value of the first temperature parameter according to the comparison table,

the signal module includes an output channel (242), the signal module receives the output value (O) and outputs a millivolt current signal for testing the thermocouple cartridge having a millivolt value (mV) equal to the output value (O), the millivolt current signal is transmitted to a measurement channel (52) of the thermocouple cartridge via the output channel to test the thermocouple cartridge.

2. The testing device of claim 1, wherein the output channel comprises two wires (2422), and the measurement channel of the thermocouple clip comprises a pair of terminals, and the two wires are connected to the pair of terminals, respectively, such that the signal module and the measurement channel can form a closed loop.

3. The testing device of claim 2, wherein the signal module comprises a plurality of output channels corresponding to the plurality of measurement channels of the thermocouple cartridge such that the signal module is connectable with the plurality of measurement channels, respectively, to form a plurality of closed loops, the signal module being capable of transmitting a millivolt current signal to each of the plurality of measurement channels.

4. The test device of claim 3, wherein the input device is configured to input a plurality of first temperature parameters in batches, the plurality of first temperature parameters corresponding in number to the plurality of output channels, and the conversion device is configured to receive the plurality of first temperature parameters from the input device and output a corresponding plurality of millivolt current signals.

5. The testing device according to claim 1, comprising a data processing module (30) connected to the input device and the thermocouple cartridge, respectively, the measurement channel of the thermocouple cartridge being capable of generating a corresponding second temperature parameter from the received millivolt current signal, the data processing module being configured to acquire the first temperature parameter and the corresponding second temperature parameter and to determine the measurement accuracy of the measurement channel of the thermocouple cartridge from the acquired first temperature parameter and the corresponding second temperature parameter.

6. The testing device according to claim 5, wherein the testing device comprises a display terminal (40) connected with the data processing module, the display terminal is provided with a display screen (42) capable of displaying the temperature value of the first temperature parameter and the temperature value of the second temperature parameter input from the data processing module, and the measurement accuracy of the measurement channel of the thermocouple clamping piece.

7. The test device of claim 2, wherein the signal module comprises a milliamp signal generator (244) and a resistor (246) having a resistance value of 1 ohm, the milliamp signal generator comprising two output terminals (2442), the two ends of the resistor being connected to the two output terminals, respectively, the milliamp signal generator being configured to receive the output value (O) and to output a milliamp current signal having a milliamp value (mA) equal to the output value (O), the two output terminals being connected to the two wires, respectively.

Images