Railway signal relay multichannel contact resistance test system and method

Abstract

A railway signal relay multichannel contact resistance test system and method belong to the railway signal relay contact resistance test technology field and comprise a main control unit, an IO expansion circuit, a contact state acquisition circuit, a test channel switching circuit, a to-be-tested relay drive circuit and a resistance test module interface circuit. The output end of the main control unit is connected with the control end of the relay driving circuit, the output end of the relay driving circuit is connected with the power supply end of a relay to be tested, the output end of the main control unit is connected with the control port of the IO expansion circuit, and the output end of the IO expansion circuit is connected with the contact state acquisition circuit and the test channel switching circuit. The test channel switching circuit is connected with the resistance test module interface circuit, and the contact of the relay to be tested is connected with the resistance test module through the resistance test module interface circuit. According to the invention, contact resistance testing can be accurately, quickly and conveniently carried out on all-model railway signal relays in the relay contact testing process.

Description

Technical Field

[0001] The invention belongs to the technical field of railway signal relay contact resistance testing, and in particular relates to a railway signal relay multi-channel contact resistance testing system and method. Background Art

[0002] Contact resistance is the main electrical characteristic parameter of the relay and an important indicator related to the reliability of relay application. At present, domestic power section maintenance stations usually use manual detection or relay test benches to test the contact resistance of relays. The manual testing process is cumbersome and the accuracy is not high. Railway signal relays have a large number of contact groups, and there are many types of relay models. The locations of contact distribution are also different. The test results need to be recorded manually, which also causes a lot of manpower and material resources. The test bench test currently used usually adopts a single-channel test method. The test process is cumbersome and the test time is long, resulting in low test efficiency. In addition, the relay is in a closed state for a long time, which will cause the relay coil temperature to rise, which may eventually lead to deviations in the relay status assessment. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a railway signal relay multi-channel contact resistance testing system and method to ensure accurate and fast testing of the relay contact resistance value.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] A railway signal relay multi-channel contact resistance test system comprises a main control unit, an IO expansion circuit, a contact state acquisition circuit, a test channel switching circuit, a relay drive circuit to be tested, and a resistance test module interface circuit. The output end of the main control unit is connected to the control end of the relay drive circuit to be tested, and the output end of the relay drive circuit to be tested is connected to the power supply end of the relay to be tested, so that the relay to be tested completes the state switching of contact closing-opening; the output end of the main control unit is connected to the control port of the IO expansion circuit, the output end of the IO expansion circuit is connected to the contact state acquisition circuit and the test channel switching circuit to control the state conversion, the test channel switching circuit is connected to the resistance test module interface circuit, and the contacts of the relay to be tested are connected to the resistance test module through the resistance test module interface circuit.

[0006] Further, the negative pole of the onboard relay in the relay drive circuit to be tested is connected to the IO port of the main control unit MCU, the positive pole of the onboard relay is connected to the 24V positive electricity, the IO ports RA0, RA1, RA2, RA3, RB2, RB3, RB4, and RB5 of the main control unit MCU are connected to the control end of the IO expansion circuit, one end of the normally open contact of the onboard relay in the contact state acquisition circuit is connected to the contact of the relay to be tested, and the other end is connected to the input end of the test channel switching circuit, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the contact state acquisition circuit, the positive pole of the onboard relay of the IO expansion circuit is connected to the 24V positive electricity, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the test channel switching circuit, the positive pole of the onboard relay in the test channel switching circuit is connected to the 24V positive electricity, one end of the onboard relay in the test channel switching circuit is connected to the input end of the contact state acquisition circuit, and the other end is connected to the resistance test module interface circuit.

[0007] A method for testing multi-channel contact resistance of a railway signal relay using the system comprises the following steps:

[0008] 1) The main control unit controls the output state conversion of the IO port expansion circuit according to the relay model to be tested;

[0009] 2) The main control unit controls the contact state acquisition circuit and the test channel switching circuit state conversion according to the relay model to be tested;

[0010] 3) combining the contact state acquisition circuit and the test channel switching circuit, and connecting them to the resistance test module through the resistance test module interface circuit;

[0011] 4) The main control unit reads the test results of multiple test circuits at the same time;

[0012] 5) A detection process is completed.

[0013] Furthermore, in the step 3), the contact positions of the relay to be tested are combined according to the model of the relay to be tested, and multi-channel resistance values ​​of multiple contacts to be tested are tested simultaneously.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides a railway signal relay multi-channel contact resistance test circuit and implementation method, which solves the problems of cumbersome manual test process, low accuracy and manual recording of test results, and saves a lot of manpower and material resources. The method of the present invention can ensure that the contact resistance test of all types of railway signal relays can be performed accurately, quickly and conveniently during the relay contact test process, thereby improving the speed of the test process and the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a multi-channel contact resistance testing system for railway signal relays of the present invention;

[0017] Figure 2 A schematic flow chart of a method for testing multi-channel contact resistance of a railway signal relay according to the present invention;

[0018] Figure 3 It is a schematic diagram of the principle of the contact state acquisition circuit of the present invention;

[0019] Figure 4 This is a schematic diagram of the IO port expansion circuit principle of the present invention;

[0020] Figure 5 It is a schematic diagram of the principle of the test channel switching circuit of the present invention;

[0021] Figure 6 It is a schematic diagram of the principle of the main control unit of the present invention;

[0022] Figure 7 It is a schematic diagram of the principle of the relay driving circuit to be tested of the present invention;

[0023] Figure 8 This is a schematic diagram of the standard base of a railway signal relay;

[0024] Fig. 9 It is a schematic diagram of the interface circuit principle of the resistance testing module of the present invention. DETAILED DESCRIPTION

[0025] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, in order to test the contact resistance value of a relay to be tested, the present invention provides a railway signal relay multi-channel contact resistance testing system and method, comprising a main control unit, an IO expansion circuit, a contact state acquisition circuit, a test channel switching circuit, and a resistance test module interface circuit of a relay drive circuit to be tested, wherein the output end of the main control unit is connected to the control end of the relay drive circuit to be tested, and the output end of the relay drive circuit to be tested is connected to the power supply end of the relay to be tested, so that the relay to be tested completes the state switching of the contact closed-open; the output end of the main control unit is connected to the control port of the IO expansion circuit, and the output end of the IO expansion circuit controls the contact state acquisition circuit and the test channel switching circuit to complete the corresponding state conversion, connects the contact of the relay to be tested to the input port of the resistance test module interface circuit, and the output port of the resistance test module interface circuit is connected to the resistance test module, and the contact of the relay to be tested is connected to the resistance test module through the resistance test module interface circuit, and the above connection is used to realize the measurement of the resistance value of all the contacts of the relay to be tested.

[0027] The railway signal relay multi-channel contact resistance test circuit can realize the railway signal relay multi-channel contact resistance test method of the present invention. Figure 3-Figure 7 The article explains how to implement the multi-channel contact resistance test circuit of railway signal relay to test the contact resistance of the relay to be tested.

[0028] When the MCU of the main control unit in the railway signal relay multi-channel contact resistance test circuit starts working, its I / O port performs high and low level conversion according to the relay model, and the negative pole of the onboard relay in the relay drive circuit to be tested is connected to the IO port of the main control unit MCU, such as Figure 6 As shown, the positive pole of the onboard relay is connected to the 24V positive power. By controlling the actions of different onboard relays, the conversion of different types of relay drive logic is completed, such as Figure 7 As shown; the IO ports RA0, RA1, RA2, RA3, RB2, RB3, RB4, and RB5 of the main control unit MCU are connected to the control end of the IO expansion circuit, and the state change of the output port of the IO expansion circuit is controlled by the conversion of the output state of the IO port of the main control unit MCU, such as Figure 4 As shown; one end of the normally open contact of the onboard relay in the contact state acquisition circuit is connected to the contact of the relay to be tested, and the other end is connected to the input end of the test channel switching circuit, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the contact state acquisition circuit, and the positive pole of the onboard relay is connected to the 24V positive power. The conversion of the output state of the IO port of the main control unit MCU controls the actions of different onboard relays, so that the corresponding onboard relay in the contact state acquisition circuit connects the contact to be tested of the relay to be tested with the test channel, as shown in FIG. Figure 3 As shown; at the same time, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the test channel switching circuit, the positive pole of the onboard relay is connected to the 24V positive power, one end of the onboard relay in the test channel switching circuit is connected to the input end of the contact state acquisition circuit, and the other end is connected to the resistance test module interface circuit, as shown Figure 5 As shown; through the cooperation of the contact state acquisition circuit and the test channel switching circuit, the resistance test module can perform multi-channel simultaneous tests on the contact positions of different relays to be tested in sequence through the resistance test module interface circuit, such as Fig. 9 shown.

[0029] Taking the JWXC-1700 relay as an example, the judgment steps of the present invention are described: the JWXC-1700 relay is a relay with 8 groups of contacts, and the distribution positions are as shown in the attached figure. Figure 8As shown, the distribution positions of 8 groups of moving contacts on the relay are 11, 21, 31, 41, 51, 61, 71, 81, the distribution positions of 8 groups of moving contacts on the relay are 12, 22, 32, 42, 52, 62, 72, 82, and the distribution positions of 8 groups of moving breaking contacts are 13, 23, 33, 43, 53, 63, 73, 83. If the contact resistance value of the front contact of the relay is tested, the RC1, RD1, RD7, and RC2 of the main control unit output low level control Figure 7 The onboard relays JQ2, JQ8, JQ84, and JQ54 in the circuit are closed, the relay to be tested is sucked up, the front contact is closed, and the IO ports RA0, RA1, RA2, RA3, RB2, RB3, RB4, and RB5 of the main control unit MCU control the output ends of the IO expansion circuit. The outputs Q1, Q2, Q3, Q4, Q37, Q38, Q39, and Q41 are low level. Figure 3 The relays JQ29, JQ30, JQ31, JQ32, JQ62, JQ80, JQ64, and JQ65 are closed, and the contact to be tested is connected to the test channel; the output ends of the IO expansion circuit Q55, Q2', Q11', Q21', Q31', Q43', Q52', and Q62' correspond to Figure 5 The JQ13, JQ18, JQ23, JQ28, JQ100, JQ110, JQ118, and JQ127 relays in the test are closed, and the contact to be tested is connected to the corresponding test channel. The test channel is connected to the resistance test module through the resistance test module interface circuit. The main control unit completes the test of the resistance value of the contact to be tested by reading the test result of the resistance test module. The main control unit can control the on-board relay in the relay drive circuit to enable the relay to be tested to complete the conversion of the moving contact and the moving contact. Figure 7 The relay states of JQ2, JQ8, JQ84 and JQ54 in the test are switched to test the resistance value of the next group of contacts;

[0030] like Figure 2 As shown, in order to test the contact resistance value of the relay to be tested (including the relay make contact and the relay break contact), the present invention provides a railway signal relay multi-channel contact resistance testing method, comprising the following steps:

[0031] 1) According to the test items and relay models, the main control unit converts the output state of the IO port expansion circuit;

[0032] 2) The main control unit performs state conversion on the contact state acquisition circuit and the test channel switching circuit according to the relay model to be tested;

[0033] 3) Combine the contact state acquisition circuit and the test channel switching circuit, and connect the relay contact under test to the test circuit;

[0034] 4) The main control unit reads the test results of multiple test circuits at the same time;

[0035] 5) A detection process is completed.

[0036] The method of the present invention adopts a method of using a contact state acquisition circuit and a test channel switching circuit to replace a one-to-one test of relay contacts, and realizes the test of the contact resistance of all types of railway signal relays through different combinations. The combination of the contact state acquisition circuit and the test channel switching circuit is introduced into the method of the present invention, so that the contact resistance value of the relay at different contact positions can be tested simply and quickly.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Alterations, modifications, substitutions and variations of the above embodiments by a person skilled in the art are all within the scope of the present invention.

Claims

1. A railway signal relay multi-channel contact resistance test system, characterized in that: The invention comprises a main control unit, an IO expansion circuit, a contact state acquisition circuit, a test channel switching circuit, a relay drive circuit to be tested, and a resistance test module interface circuit. The output end of the main control unit is connected to the control end of the relay drive circuit to be tested, and the output end of the relay drive circuit to be tested is connected to the power supply end of the relay to be tested, so that the relay to be tested completes the state switching of the contact closed-open; the output end of the main control unit is connected to the control port of the IO expansion circuit, the output end of the IO expansion circuit is connected to the contact state acquisition circuit and the test channel switching circuit to control the state conversion, the test channel switching circuit is connected to the resistance test module interface circuit, and the contacts of the relay to be tested are connected to the resistance test module through the resistance test module interface circuit.

2. A railway signal relay multi-channel contact resistance test system according to claim 1, characterized in that: The negative pole of the onboard relay in the relay driving circuit to be tested is connected to the IO port of the main control unit MCU, the positive pole of the onboard relay is connected to the 24V positive electricity, the IO ports RA0, RA1, RA2, RA3, RB2, RB3, RB4, and RB5 of the main control unit MCU are connected to the control end of the IO expansion circuit, one end of the normally open contact of the onboard relay in the contact state acquisition circuit is connected to the contact of the relay to be tested, and the other end is connected to the input end of the test channel switching circuit, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the contact state acquisition circuit, the positive pole of the onboard relay of the IO expansion circuit is connected to the 24V positive electricity, the output port of the IO expansion circuit is connected to the negative pole of the onboard relay in the test channel switching circuit, the positive pole of the onboard relay in the test channel switching circuit is connected to the 24V positive electricity, one end of the onboard relay in the test channel switching circuit is connected to the input end of the contact state acquisition circuit, and the other end is connected to the resistance test module interface circuit.

3. A method for testing multi-channel contact resistance of railway signal relays using the system described in any one of claims 1-2, characterized in that: The steps include: 1) The main control unit controls the output state conversion of the IO port expansion circuit according to the relay model to be tested; 2) The main control unit controls the contact state acquisition circuit and the test channel switching circuit state conversion according to the relay model to be tested; 3) combining the contact state acquisition circuit and the test channel switching circuit, and connecting them to the resistance test module through the resistance test module interface circuit; 4) The main control unit reads the test results of multiple test circuits at the same time; 5) A detection process is completed.

4. The railway signal relay multi-channel contact resistance testing method according to claim 3, characterized in that: In the step 3), the contact positions of the relay to be tested are combined according to the model of the relay to be tested, and a multi-channel resistance value test is performed on multiple contacts to be tested simultaneously.

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