A micro switch tester and test method

Abstract

The present invention discloses a micro switch tester and a test method, which belong to the field of aircraft engine manufacturing. Through the micro switch test circuit, the deviation of the micro switch of the test piece relative to the standard time reference of the butterfly valve opening or closing can be qualitatively and quantitatively detected, and the qualified adjustment of the actuating arm of the micro switch of the test piece can be indirectly detected. The tester has the advantages of simple structure, convenient operation, low cost, stable and reliable performance, etc., and can complete the detection and adjustment of the micro switch. It effectively solves the problem in the prior art that the static verification result of the micro switch is different from the dynamic use effect after being installed on the aircraft engine, and can realize the automation of micro switch assembly verification, digitization of the process, and judgment of the results, thereby improving the efficiency of micro switch assembly and debugging and the accuracy of action after being installed on the aircraft engine.

Description

Technical Field

[0001] The invention belongs to the field of aviation engine manufacturing, and in particular relates to a micro switch tester and a test method. Background Art

[0002] For the micro switch used for aircraft engine butterfly valve detection ( Figure 1 , the micro switch housing is equipped with: 1 cross-shaped actuating cam, 2 micro switches A and B stacked up and down with their own actuating arms. An aviation socket is installed outside the housing: the contacts "A" and "B" on the socket are connected to one end of the normally closed contacts of the micro switches A and B respectively, and the contact "C" on the socket is connected to the other end of the normally closed contacts of the micro switches A and B). During the assembly process, a multimeter is used in combination with visual inspection to detect the angles of the actuating arms of the two micro switches A and B pressed by the cross-shaped actuating cam inside the micro switch housing and the "open" and "closed" positions of the butterfly valve. When the actuating arm of the micro switch rotates 11°30′-12°30′, that is, when the contact point of the actuating arm leaves the top (visual) edge of the cam by 2.5mm, check respectively: when the valve is closed ( Figure 2 , the cross-shaped actuating cam rotates clockwise, pressing the actuating arm of the micro switch A installed on the upper layer), the contacts "A" and "C" should be disconnected; when the valve is opened ( Figure 3 , the cross-shaped actuating cam rotates counterclockwise, touching the actuating arm of the micro switch B installed on the lower layer), and the contacts "B" and "C" should be disconnected. When the micro switch action deviates, adjust it by bending the actuating arm of the micro switch (not wrinkled) to meet the requirements. Since there is no special tester, and the internal space of the micro switch housing is small, the two micro switches are stacked up and down, and the actuating arms are blocked up and down, the angle of the actuating arm equipped with each micro switch is visually adjusted to the relative position of the top (visual) edge of the cross-shaped actuating cam, and then the disconnection of the micro switch contacts is measured with a multimeter. Human factors have a great influence on the test results. The static verification results of the micro switch are different from the dynamic use effects after being installed on the aircraft engine, resulting in incorrect indications and false alarms of the butterfly valve working process after the qualified micro switch is installed on the aircraft engine, affecting the correct judgment and operation of the aircraft pilot. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a micro switch tester and test method to solve the problem that the prior art lacks a micro switch test device, the detection process cannot be quantitatively detected, and the detection results are greatly affected by human factors.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention discloses a micro switch tester, comprising: a workbench, an operation panel, a linkage unit, a pressure / flow regulating unit and a test circuit. The operation panel is vertically arranged on the workbench, a mounting frame is arranged on one side of the operation panel, the micro switch is arranged on the mounting frame, a window is opened on the front of the operation panel, an air main pipe component is fixed behind the operation panel so that a butterfly valve faces the window, the linkage unit is arranged on the workbench to connect the micro switch and the butterfly valve, and the linkage unit is connected to the pressure / flow regulating unit, the pressure / flow regulating unit and the test circuit are both arranged below the workbench, and the test circuit is respectively connected to a two-position three-way solenoid valve coil and the micro switch in the pressure / flow regulating unit.

[0006] Preferably, the linkage unit includes: a universal connecting shaft, a butterfly valve rocker arm and an air actuator, the universal connecting shaft connects the micro switch and the butterfly valve, one end of the butterfly valve rocker arm is connected to the universal connecting shaft, and the other end is connected to the air actuator, and the air actuator is connected to the pressure / flow regulating unit.

[0007] Preferably, the pressure / flow regulating unit also includes: a needle valve, an oxygen meter, an intermediate ball valve, a bypass ball valve, an air source triplet, a pressure gauge and a damper; the needle valve, oxygen meter, an intermediate ball valve, a bypass ball valve, an air source triplet, a pressure gauge and a two-position three-way solenoid valve are connected in sequence, the two-position three-way solenoid valve is respectively connected to the linkage unit and the test circuit, and the damper is connected to the two-position three-way solenoid valve.

[0008] Preferably, the test circuit includes: a DC power supply, a knob SA, a signal light HL, a timer KT1, a timer KT2, a relay KA1 and a relay KA2; after the DC power supply is connected to the knob SA, the two-position three-way solenoid valve coil in the pressure / flow regulating unit is connected in series, the relay KA1 is connected in parallel with the two-position three-way solenoid valve coil in the pressure / flow regulating unit, the timer KT1 is connected in parallel with the series branch of the knob SA and the two-position three-way solenoid valve coil in the pressure / flow regulating unit, and the first normally closed contact of the relay KA1 is connected between the first terminal of the timer KT1 and the reset terminal, and the second normally closed contact of the relay KA2 is connected between the first terminal of the timer KT1 and the pause terminal; the timer KT2 is connected to the timer KT1 is connected in parallel, and the third normally open contact of relay KA1 is connected between the first terminal of timer KT2 and the reset terminal, and the third normally closed contact of relay KA2 is connected between the first terminal of timer KT2 and the pause terminal; the first normally open contact of relay KA2 is connected in series with the signal light HL and then connected in parallel with timer KT2; one end of the normally closed contact of microswitch A in the microswitch (in the touch-pressure disconnect state) is connected to the second normally closed contact of relay KA1, and one end of the normally closed contact of microswitch B is connected to the fourth normally open contact of relay KA1, and the other end of the normally closed contact of microswitch A in the microswitch (in the touch-pressure disconnect state) and the other end of the normally closed contact of microswitch B are connected in series with the relay KA2 coil and then connected in parallel with timer KT2.

[0009] Preferably, the timer KT1 and the timer KT2 are digital display time relays.

[0010] Preferably, the relay KA1 and the relay KA2 are MY4N type small relays.

[0011] The present invention also discloses a micro switch testing method, comprising:

[0012] Fix the micro switch and the air main assembly including the butterfly valve on the tester;

[0013] Open or close the butterfly valve, and observe the on-off state of the test circuit and the status of the butterfly valve disc;

[0014] If the butterfly valve flap does not reach the end position during the fully open or fully closed state movement when the test circuit is disconnected, the actuating arm of the micro switch triggers the contact action in advance;

[0015] If the butterfly valve disc has reached the end position in the fully open or fully closed state when the test circuit is not disconnected, the actuating arm of the micro switch triggers the contact action with lag;

[0016] If the fully open or fully closed movement of the butterfly valve disc reaches the end position when the test circuit is disconnected, the actuating arm of the microswitch triggers the contact action and is qualified.

[0017] Preferably, the actuating arm angle of the micro switch is qualified within the range of 11°30′-12°30′.

[0018] Preferably, a signal light HL is provided in the test circuit. When the test circuit is connected, the signal light HL is on, and when the test circuit is disconnected, the signal light HL is off.

[0019] Preferably, the test circuit is also provided with a timer KT1 and a timer KT2, both of which are digital time relays, timer KT1 is used for valve opening timing, and timer KT2 is used for valve closing timing, when the test circuit is connected, timer KT1 or timer KT2 starts timing, and when the test circuit is disconnected, timer KT1 or timer KT2 stops timing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A micro switch tester disclosed in the present invention comprises a workbench, an operation panel, a linkage unit, a pressure / flow regulating unit and a test circuit. By combining the linkage unit, the pressure / flow regulating unit and the test circuit, the opening or closing of the micro switch of the test piece relative to the butterfly valve is qualitatively and quantitatively detected by comparing the on-off of the test circuit and the opening or closing degree of the butterfly valve, thereby reducing the influence of human factors on the test results. At the same time, the pressure / flow regulating unit adjusts the working pressure of the linkage unit, the opening speed of the butterfly valve and the closing speed of the butterfly valve.

[0022] The present invention discloses a micro switch test method, which can qualitatively and quantitatively detect the deviation of the micro switch of the test piece relative to the standard time reference of the butterfly valve opening or closing through the micro switch test circuit, and indirectly detect the qualified adjustment of the actuator arm of the micro switch of the test piece. The tester has the advantages of simple structure, convenient operation, low cost, stable and reliable performance, etc., and can complete the detection and adjustment of the micro switch. It effectively solves the problem in the prior art that there is a difference between the static verification result of the micro switch and the dynamic use effect after being installed on the aircraft engine, and can realize the automation of micro switch assembly verification, digitization of the process, and judgment of the results, thereby improving the efficiency of micro switch assembly and debugging and the accuracy of action after being installed on the aircraft engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the internal structure diagram of the micro switch housing;

[0024] Figure 2 This is a working diagram of the micro switch A actuating arm and the cross-shaped actuating cam;

[0025] Figure 3 This is a schematic diagram of the operation of the micro switch B actuating arm and the cross-shaped actuating cam;

[0026] Figure 4 It is a schematic diagram of the structure of the tester of the present invention;

[0027] Figure 5 This is a diagram of a test plan for a valve micro switch of the present invention;

[0028] Figure 6 It is a test circuit diagram of the valve micro switch of the present invention.

[0029] Among them: 1-butterfly valve; 2-micro switch; 3-cross-shaped actuating cam; A-micro switch A; B-micro switch B; 4-universal connecting shaft; 5-butterfly valve rocker arm; 6-air actuator; 7-needle valve; 8-oxygen meter; 9-intermediate ball valve; 10-bypass ball valve; 11-air source triplex; 12-pressure gauge; 13-two-position three-way solenoid valve; 14-damping; 15-operation panel; 16-air main pipe assembly; P-micro switch; XP-aviation plug / socket of micro switch. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0033] The purpose of the invention is to provide a tester and a test method thereof which can solve the problem of the difference between the static verification result of a micro switch and the dynamic use effect after being installed on an aircraft engine, realize the automation of micro switch assembly verification, digitization of the process, and judgment of the results, improve the efficiency of micro switch assembly and debugging, and the accuracy of action after being installed on an aircraft engine.

[0034] See also Figure 4 , Figure 5 The micro switch tester comprises: a workbench, an operation panel 15, a linkage unit, a pressure / flow regulating unit and a test circuit. The operation panel 15 is vertically arranged on the workbench, a mounting frame is arranged on one side of the operation panel 15, and the micro switch 2 is arranged on the mounting frame. The connection method of its mechanical and electrical parts with the tester is exactly the same as the connection method on the aircraft engine; a window is opened on the front of the operation panel 15, and the air main pipe assembly 16 is fixed behind the operation panel 15 so that the butterfly valve 1 faces the window. The linkage unit is arranged on the workbench to connect the micro switch 2 and the butterfly valve 1, and the linkage unit is connected to the pressure / flow regulating unit. The pressure / flow regulating unit and the test circuit are both arranged under the workbench, and the test circuit is respectively connected to the coil of the two-position three-way solenoid valve 13 and the micro switch 2 in the pressure / flow regulating unit. The linkage unit includes: a universal connecting shaft 4, a butterfly valve rocker arm 5 and an air actuator 6. The universal connecting shaft 4 connects the micro switch 2 and the butterfly valve 1. One end of the butterfly valve rocker arm 5 is connected to the universal connecting shaft 4, and the other end is connected to the air actuator 6. The air actuator 6 is connected to a two-position three-way solenoid valve 13. The pressure / flow regulating unit includes: a needle valve 7, an oxygen meter 8, an intermediate ball valve 9, a bypass ball valve 10, an air source triplet 11, a pressure gauge 12, a two-position three-way solenoid valve 13 and a damper 14; the needle valve 7, the oxygen meter 8, the intermediate ball valve 9, the bypass ball valve 10, the air source triplet 11, the pressure gauge 12 and the two-position three-way solenoid valve 13 are connected in sequence, the two-position three-way solenoid valve 13 is respectively connected to the air actuator 6 and the test circuit, and the damper 14 is connected to the two-position three-way solenoid valve 13. See Figure 6The test circuit includes: a DC power supply, a knob SA, a signal light HL, a timer KT1, a timer KT2, a relay KA1 and a relay KA2; after the DC power supply is connected to the knob SA, the two-position three-way solenoid valve 13 coil YV is connected in series, the relay KA1 is connected in parallel with the two-position three-way solenoid valve 13 coil YV in the pressure / flow regulating unit, the timer KT1 is connected in parallel with the series branch of the knob SA and the two-position three-way solenoid valve 13 coil YV in the pressure / flow regulating unit, and the first normally closed contact of the relay KA1 is connected between the first terminal of the timer KT1 and the reset terminal, and the second normally closed contact of the relay KA2 is connected between the first terminal of the timer KT1 and the pause terminal; the timer KT2 and the timer KT 1 in parallel, and the third normally open contact of relay KA1 is connected between the first terminal of timer KT2 and the reset terminal, and the third normally closed contact of relay KA2 is connected between the first terminal of timer KT2 and the pause terminal; the first normally open contact of relay KA2 is connected in series with the signal light HL and then connected in parallel with timer KT2; one end of the normally closed contact of microswitch A in microswitch 2 (in the touch-pressure disconnect state) is connected to the second normally closed contact of relay KA1, and one end of the normally closed contact of microswitch B is connected to the fourth normally open contact of relay KA1, and the other end of the normally closed contact of microswitch A in microswitch 2 (in the touch-pressure disconnect state) and the other end of the normally closed contact of microswitch B are connected in series with the relay KA2 coil and then connected in parallel with timer KT2. When the butterfly valve 1 is opened or closed, the cross-shaped actuating cam 3 in the housing of the micro switch 2 rotates counterclockwise or clockwise through the transmission of the universal connecting shaft 4 connected to the butterfly valve 1, and the actuating arms of the two micro switches A and B are pressed or released, so that the contacts of the micro switch 2 connect or disconnect the signal light and the timing circuit, thereby indicating the movement process of the valve disc of the butterfly valve 1 (light on, timing) and the full open or full closed state of the valve disc of the butterfly valve 1 (light off, timing ends). If at the end of the timing, it is observed in the opening of the operation panel that the full open or full closed movement process of the valve disc of the butterfly valve 1 has not reached the end position, it means that the actuating arm of the micro switch 2 of the test piece triggers the contact action in advance, and the actuating arm angle needs to be adjusted smaller. The more the timing end time deviates from the standard time reference, the more the actuating arm angle needs to be adjusted down; if the timing has not ended, and the fully open or fully closed movement process of the butterfly valve 1 disc has reached the end position, it means that the actuating arm trigger contact of the micro switch 2 of the test piece has lagged, and the actuating arm angle needs to be increased; if the fully open or fully closed movement process of the butterfly valve 1 disc has just reached the end position at the end of the timing, it means that the actuating arm trigger contact of the micro switch 2 of the test piece has qualified action, and the actuating arm angle is within the qualified range of 11°30′-12°30′. In this way, by detecting the on and off of the signal light and timing of the fully open or fully closed movement process of the butterfly valve disc, the opening / closing of the butterfly valve and the assembly adjustment effect of the micro switch of the test piece can be indirectly detected.The control of the timing end time ensures that the action of the micro switch and the position of the "open" or "closed" of the aircraft engine butterfly valve are in the qualified and lower deviation, that is: when the micro switch 2 is actuated, the butterfly valve 1 is just "opened" or "closed", or the butterfly valve 1 is about to be "opened" or "closed", and the adjustment of the actuating arm can ensure the action accuracy of the micro switch 2; when the timing is not over, the action of the micro switch and the position of the "open" or "closed" of the aircraft engine butterfly valve 1 are in the upper deviation, that is: the valve has been "opened" or "closed", and the micro switch 2 has not yet acted. It must be adjusted to the qualified and lower deviation, otherwise it will affect the correct judgment and operation of the aircraft pilot. Before the test, the aircraft engine micro switch that has passed the test run is used as a standard part calibration tester to determine the standard time benchmark of the micro switch that has passed the test.

[0035] The pressure / flow regulating unit adjusts the working pressure of the air actuator of the butterfly valve, the opening speed of the butterfly valve, and the closing speed of the butterfly valve; the micro switch test circuit is composed of commonly used electrical components. The detection principle is the core technology of the entire tester. The existing technology of rotating the actuating arm of the micro switch of the test piece by 11°30′-12°30′ or the contact point of the actuating arm is 2.5mm away from the top (visual) edge of the cam to detect the disconnection of the micro switch contacts in the micro switch housing is innovative: qualitative and quantitative detection of the deviation from the standard time reference for opening or closing the butterfly valve.

[0036] The present invention also discloses a micro switch testing method, comprising:

[0037] Fix the micro switch 2 and the air main pipe assembly 16 including the butterfly valve 1 on the tester;

[0038] Open or close butterfly valve 1, and observe the on-off state of the test circuit and the disc state of butterfly valve 1;

[0039] If the fully open or fully closed state of the butterfly valve 1 does not reach the end position when the test circuit is disconnected, the actuating arm of the micro switch 2 triggers the contact action in advance;

[0040] If the fully open or fully closed state of the butterfly valve 1 has reached the end position when the test circuit is not disconnected, the actuating arm of the micro switch 2 will trigger the contact with a lag in action;

[0041] If the fully open or fully closed movement of the butterfly valve 1 disc reaches the end position when the test circuit is disconnected, the actuating arm trigger contact of the micro switch 2 will be qualified.

[0042] The linkage device between the micro switch 2 and the butterfly valve 1 is constructed with aero-engine structural parts and accessories such as a universal connecting shaft 4, a butterfly valve rocker arm 5, and an air actuator 6; the pressure and flow regulating device of the air system is composed of a needle valve 7, an oxygen meter 8, an intermediate ball valve 9, a bypass ball valve 10, an air source triplet 11, a pressure gauge 12, a two-position three-way solenoid valve 13, and a damper 14. The bypass ball valve 10 adjusts the working pressure of the air actuator 6 of the butterfly valve 1, the intermediate ball valve 9 adjusts the opening speed of the butterfly valve 1, and the damper 14 at the exhaust port of the two-position three-way solenoid valve 13 adjusts the closing speed of the butterfly valve 1; the micro switch test circuit is composed of a 24V DC power supply, a knob, a signal light, a digital display time relay, a small relay, an aviation plug (matched with the micro switch housing), etc. The specific circuit is shown in Figure 6 The "valve opening timer" timer KT1 and the "valve closing timer" timer KT2 use DH48S digital display time relays, and the relays KA1 and KA2 use MY4N small relays; the aircraft engine micro switch that has passed the test is used as a standard part, installed on the micro switch mounting frame of the tester, and the opening and closing time of the butterfly valve 1 of the tester is adjusted to be consistent with the test bench, which is about 1s. Unlike the formal test, no adjustment can be made to the actuator arm of the standard micro switch 2. After the time base calibration of the qualified micro switch of the tester is completed, the standard micro switch 2 is removed, and the micro switch 2 of the test piece is installed, and the test of the micro switch of the test piece can be carried out;

[0043] 1. Inspection of the micro switch 2 of the test piece when the butterfly valve 1 is "open":

[0044] Initial state: the butterfly valve 1 is in the fully closed state, the cross-shaped actuating cam 3 makes the actuating arm of the microswitch A in the contact pressure state (the normally closed contact of the contact "A" and "C" is disconnected), and the actuating arm of the microswitch B is in the released state (the normally closed contact of the contact "B" and "C" is closed).

[0045] The knob SA is turned to the "valve open" position (SA contact closed), the coil YV of the two-position three-way solenoid valve 13 is energized, the two-position three-way solenoid valve 13 is connected to compressed air, and the actuator 6 drives the butterfly valve 1 disc to move "forward". At the same time, the normally closed contacts of the contacts "A" and "C" are closed after the contact pressure is released. Due to the action of the cross-shaped actuating cam 3 connected to the butterfly valve 1, the actuating arm of the micro switch B gradually enters the contact pressure state, and the movement process of the butterfly valve 1 disc "opening" begins. At the same time, the coil of the relay KA1 is energized:

[0046] 1) KA1-1 is disconnected, and the "reset" terminals ①-③ of the "valve opening timer" timer KT1 are disconnected, and the timer KT1 is ready for timing;

[0047] 2) KA1-3 are closed, the "reset" terminals ①-③ of the "valve closing timer" timer KT2 are closed, and the timer KT2 is "reset to zero";

[0048] 3) KA1-4 is closed, the normally closed contacts of the micro switch contacts "B" and "C" are closed → the relay KA2 coil is energized:

[0049] (1) KA2-1 is closed, and the valve working indicator light HL lights up;

[0050] (2) KA2-2 is disconnected, the "pause" terminals ①-④ of KT1 are disconnected, and KT1 starts "stopwatch";

[0051] After 1 second, the butterfly valve 1 is fully opened, the actuating arm of the micro switch B is pressed (equivalent to the actuating arm rotating 11°30′-12°30′, that is, when the contact point of the actuating arm is 2.5mm away from the top edge of the cam), the normally closed contacts of the connection points "B" and "C" are pressed and disconnected, and the coil of the relay KA2 loses power:

[0052] 4) KA2-2 is closed, and the "pause" terminals ①-④ of KT1 are closed, and the "stopwatch" is paused, displaying the "time taken" for the butterfly valve to be fully opened.

[0053] 5) KA2-1 is disconnected and the “valve working indicator light” HL goes out.

[0054] If HL remains on and does not go out after 1 second, and KT1 continues to "run the watch", it means that the micro switch B does not correspond to the fully open position of the butterfly valve disc. Adjust the actuating arm of the micro switch B and test again.

[0055] (2) Inspection of the micro switch 2 of the test piece when the butterfly valve 1 is “closed”:

[0056] Initial state: the butterfly valve 1 is in the fully open state, the cross-shaped actuating cam 3 makes the actuating arm of the microswitch A in the released state (the normally closed contacts of the contacts "A" and "C" are closed), and the actuating arm of the microswitch B is in the pressed state (the normally closed contacts of the contacts "B" and "C" are disconnected).

[0057] The knob SA is turned to the "valve closed" position (SA contact is disconnected), the two-position three-way solenoid valve 13 coil YV is de-energized, the two-position three-way solenoid valve 13 is disconnected from the compressed air, and the spring in the actuator cylinder 6 is reset, driving the butterfly valve 1 disc to move "in the opposite direction". At the same time, the normally closed contacts of the contacts "B" and "C" are closed after the contact pressure is released. Due to the action of the cross-shaped actuating cam connected to the butterfly valve 1, the actuating arm of the micro switch A gradually enters the contact pressure state, and the movement process of the butterfly valve 1 disc "closing" begins. At the same time, the relay KA1 coil is de-energized:

[0058] 1) KA1-3 are disconnected, and the "reset" terminals ①-③ of the "valve closing timer" timer KT2 are disconnected, and KT2 is ready for timing;

[0059] 2) KA1-1 is closed, the "reset" terminals ①-③ of the "valve opening timer" timer KT1 are closed, and the timer KT1 is "reset to zero";

[0060] 3) KA1-2 is closed, the normally closed contacts of the micro switch contacts "A" and "C" are closed → the relay KA2 coil is energized:

[0061] (1) KA2-1 is closed and the indicator light HL lights up;

[0062] (2) KA2-3 is disconnected, the "pause" terminals ①-④ of timer KT2 are disconnected, and timer KT2 starts "stopwatch";

[0063] After 1s, the butterfly valve is fully closed, the actuating arm of micro switch A is pressed (equivalent to the actuating arm rotating 11°30′-12°30′, that is, when the contact point of the actuating arm is 2.5mm away from the top edge of the cam), the normally closed contacts of the connection points "A" and "C" are pressed and disconnected, and the KA2 coil loses power:

[0064] 4) KA2-3 is closed, the "pause" terminals ①-④ of timer KT2 are closed, the "stopwatch" is paused, and the "time taken" for the butterfly valve to be fully closed is displayed.

[0065] 5) KA2-1 is disconnected and the “valve working indicator light” HL goes out.

[0066] If after 1 second, the signal light HL remains on and the timer KT2 continues to run, it means that the micro switch A does not correspond to the fully closed position of the butterfly valve disc. Adjust the actuating arm of the micro switch A and retest.

[0067] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A micro switch tester, characterized in that: include: A workbench, an operation panel (15), a linkage unit, a pressure / flow regulating unit and a test circuit, wherein the operation panel (15) is vertically arranged on the workbench, a mounting frame is arranged on one side of the operation panel (15), a micro switch (2) is arranged on the mounting frame, a window is opened on the front of the operation panel (15), an air main pipe assembly (16) is fixed to the operation panel (15) so that the butterfly valve (1) faces the window, the linkage unit is arranged on the workbench to connect the micro switch (2) and the butterfly valve (1), and the linkage unit is connected to the pressure / flow regulating unit, the pressure / flow regulating unit and the test circuit are arranged below the workbench, and the test circuit is respectively connected to the coil of the two-position three-way solenoid valve (13) and the micro switch (2) in the pressure / flow regulating unit; The test circuit includes: a DC power supply, a knob SA, a signal lamp HL, a timer KT1, a timer KT2, a relay KA1 and a relay KA2; After the DC power supply is turned on the knob SA, the two-position three-way solenoid valve (13) coil YV in the pressure / flow regulating unit is connected in series, the relay KA1 coil is connected in parallel with the two-position three-way solenoid valve (13) coil YV in the pressure / flow regulating unit, the timer KT1 is connected in parallel with the series branch of the knob SA and the two-position three-way solenoid valve (13) coil YV in the pressure / flow regulating unit, and the first normally closed contact of the relay KA1 is connected between the first terminal of the timer KT1 and the reset terminal, and the second normally closed contact of the relay KA2 is connected between the first terminal of the timer KT1 and the pause terminal; the timer KT2 is connected in parallel with the timer KT1, and the timer KT The third normally open contact of the relay KA1 is connected between the first terminal of the micro switch (2) and the reset terminal, and the third normally closed contact of the relay KA2 is connected between the first terminal of the timer KT2 and the pause terminal; the first normally open contact of the relay KA2 is connected in series with the signal light HL and then connected in parallel with the timer KT2; one end of the normally closed contact of the micro switch A in the micro switch (2) is connected to the second normally closed contact of the relay KA1, one end of the normally closed contact of the micro switch B is connected to the fourth normally open contact of the relay KA1, and the other end of the normally closed contact of the micro switch A in the micro switch (2) and the other end of the normally closed contact of the micro switch B are connected in series with the coil of the relay KA2 and then connected in parallel with the timer KT2.

2. A micro switch tester according to claim 1, characterized in that: The linkage unit comprises: a universal connecting shaft (4), a butterfly valve rocker arm (5) and an air actuator (6); the universal connecting shaft (4) is connected to the micro switch (2) and the butterfly valve (1); one end of the butterfly valve rocker arm (5) is connected to the universal connecting shaft (4) and the other end is connected to the air actuator (6); the air actuator (6) is connected to the pressure / flow regulating unit.

3. A micro switch tester according to claim 1, characterized in that: The pressure / flow regulating unit further comprises: a needle valve (7), an oxygen meter (8), an intermediate ball valve (9), a bypass ball valve (10), an air source triplet (11), a pressure gauge (12) and a damper (14); the needle valve (7), the oxygen meter (8), the intermediate ball valve (9), the bypass ball valve (10), the air source triplet (11), the pressure gauge (12) and the two-position three-way solenoid valve (13) are connected in sequence, the two-position three-way solenoid valve (13) is respectively connected to the linkage unit and the test circuit, and the damper (14) is connected to the two-position three-way solenoid valve (13).

4. A micro switch tester according to claim 1, characterized in that: The timer KT1 and the timer KT2 are digital display time relays.

5. A micro switch tester according to claim 1, characterized in that: The relay KA1 and the relay KA2 are small relays.

6. A test method for a micro switch tester according to any one of claims 1 to 5, characterized in that: include: Fix the micro switch (2) and the air main assembly (16) including the butterfly valve (1) on the tester; Open or close the butterfly valve (1) and observe the on / off state of the test circuit and the status of the butterfly valve (1); If the fully open or fully closed state of the butterfly valve (1) does not reach the end position when the test circuit is disconnected, the actuating arm of the micro switch (2) triggers the contact action in advance; If the fully open or fully closed movement of the butterfly valve (1) has reached the end position when the test circuit is not disconnected, the actuating arm of the micro switch (2) triggers the contact with a lag in action; If the fully open or fully closed movement of the butterfly valve (1) reaches the end position when the test circuit is disconnected, the actuating arm trigger contact of the micro switch (2) will be qualified.

7. A test method for a micro switch tester according to claim 6, characterized in that: The actuating arm angle of the micro switch (2) is qualified when it is between 11°30′ and 12°30′.

8. The testing method of a micro switch tester according to claim 6, characterized in that: A signal light HL is provided in the test circuit. When the test circuit is connected, the signal light HL is on, and when the test circuit is disconnected, the signal light HL is off.

9. The testing method of a micro switch tester according to claim 6, characterized in that: The test circuit is also provided with a timer KT1 and a timer KT2, both of which are digital display time relays. Timer KT1 is used for valve opening timing, and timer KT2 is used for valve closing timing. When the test circuit is connected, timer KT1 or timer KT2 starts timing, and when the test circuit is disconnected, timer KT1 or timer KT2 ends timing.

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