A testing device and method for testing the delay time and response time of a solenoid valve

Abstract

A kind of electromagnetic valve delay time and response time testing device, including test bench, and electromagnetic valve fixed on test bench by fixing plate, the electromagnetic valve includes electromagnetic valve spool and controller, the controller of electromagnetic valve is connected with host computer by signal line;Left contact plate and right contact plate are installed on the side close to electromagnetic valve spool on the test bench, and the side opposite left contact plate and right contact plate is correspondingly provided with upper contact and lower contact;The electromagnetic valve spool is connected with valve core connecting rod by screw thread, and the other end of valve core connecting rod is fixedly installed with contact iron block that is contacted with upper contact and lower contact;The upper contact and lower contact are connected with the two ends of resistance R respectively by wire, and the two ends of resistance R are connected with the channel one of oscilloscope respectively by wire, and the voltage value of the two ends of resistance R is collected by channel one of oscilloscope;The channel two of oscilloscope is connected with host computer by pulse width signal line, and the pulse width signal of electromagnetic valve is collected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valve testing, in particular to a testing device and method for the delay time and response time of an electromagnetic valve. BACKGROUND

[0002] Hydraulic electromagnetic valves have a response time in the process of issuing a pulse width action command by the host computer to completing the action. In some applications where the response of the electromagnetic valve is required to be high, it is necessary to accurately estimate the response time of the electromagnetic valve to provide correction parameters for the control of the electromagnetic valve. Application No. "CN201811559306.5" discloses "a method for testing the response time of an electromagnetic valve, which includes fixing the electromagnetic valve to be tested to a test bench, positioning the electromagnetic valve by a high-speed camera, issuing a work instruction to the electromagnetic valve to make the valve core of the electromagnetic valve extend, recording the images of the electromagnetic valve from receiving the work instruction to the valve core fully extending by the high-speed camera, and processing and analyzing the images to obtain the response time of the electromagnetic valve and the action time of the valve core through the images. The electromagnetic valve response time testing method provided by the present application realizes the testing of the delay time and response time of the electromagnetic valve from the host computer, facilitates the debugging of the electromagnetic valve in use, and also improves the debugging accuracy of the electromagnetic valve".

[0003] The above-mentioned application realizes the testing of the delay time and response time of the electromagnetic valve, facilitates the debugging of the electromagnetic valve in use, and also improves the debugging accuracy of the electromagnetic valve. However, in actual testing, the detection speed of the camera is required to be very high, and slight delay may occur, resulting in large testing error. SUMMARY

[0004] In view of the above technical problems, the present technical solution provides a testing device and method for the delay time and response time of an electromagnetic valve, which can effectively solve the above problems.

[0005] The present application is achieved by the following technical solutions:

[0006] The utility model provides a kind of electromagnetic valve delay time and response time testing device, including test bench, and electromagnetic valve fixed on test bench by fixed plate, the electromagnetic valve includes electromagnetic valve spool and controller, and the controller of electromagnetic valve is connected with host computer by signal line;Left contact plate and right contact plate are installed on the side close to electromagnetic valve spool on the test bench, and upper contact and lower contact are correspondingly arranged on the side opposite to left contact plate and right contact plate;Electromagnetic valve spool is connected with valve core connecting rod by screw thread, and the other end of valve core connecting rod is fixedly installed with contact iron block which is contacted with upper contact and lower contact;Upper contact and lower contact are connected with the two ends of resistance R respectively by wire, and the two ends of resistance R are connected with the channel one of oscilloscope by wire respectively, and the voltage value of the two ends of resistance R is collected by channel one of oscilloscope;The channel two of oscilloscope is connected with host computer by pulse width signal line, and the pulse width signal of electromagnetic valve is collected.

[0007] Further, the left contact plate and the right contact plate are made of insulating material;The bottom of the left contact plate and the right contact plate is provided with a threaded hole, which is installed on the test bench by a fine adjustment bolt, and the distance between the bottom of the left contact plate and the right contact plate and the test bench can be adjusted by rotating the fine adjustment bolt.

[0008] Further, the left contact plate and the right contact plate are spaced apart;A contact and B contact are fixedly arranged on the inner side of the left contact plate, and E contact and F contact are fixedly arranged on the inner side of the right contact plate;When the left end surface of the contact iron block is in contact with the dome surface of A contact and B contact, the maximum adjustable distance of the electromagnetic valve is the distance between the end surface of the contact iron block and the dome surface of E contact and F contact, which is set as S.

[0009] Further, B contact and F contact are connected with one end of resistance R by wire, and A contact and F contact are connected with the other end of resistance R after being connected with power supply by wire;The entire circuit is only conducted when the end surface of the contact iron block is in complete contact with the dome surface of the contact.

[0010] Further, when the left end of the contact iron block is in complete contact with A contact and B contact, the voltage value of R in the channel 1 acquisition circuit of the oscilloscope is 5V;When the right end of the contact iron block is in complete contact with E contact and F contact, the voltage value of R in the channel 1 acquisition circuit of the oscilloscope is 5V;When the end surface of the contact iron block is not in contact with the contact, the voltage value of R in the channel 1 acquisition circuit of the oscilloscope is 0V.

[0011] Further, the positive line of the power supply is led out and welded with the top end of A contact and F contact in turn, and the negative line of the power supply is led out, passes through resistance R first, and then is welded with the bottom end of B contact and F contact in turn.

[0012] Further, the contact iron block and the valve core connecting rod are the same entity, the valve core connecting rod is coaxial with the electromagnetic valve core, and is connected with the valve core through threads.

[0013] A test method for delay time and response time of an electromagnetic valve, characterized by comprising the following specific steps:

[0014] S1, first fix the electromagnetic valve on the electromagnetic valve fixing plate through bolts, and then fix the electromagnetic valve fixing plate on the test bench through bolts;

[0015] S2, fine-tune the fine-tuning screw at the bottom of the left contact point plate, adjust the height of the left contact point plate, so that the left end surface of the contact iron block is in contact with the dome surface of the circuit contacts A and B;

[0016] S3, fine-tune the fine-tuning screw at the bottom of the right contact point plate, adjust the height of the right contact point plate, so that the right end surface of the contact iron block is in contact with the dome surface of the circuit contacts E and F; the distance S required for the electromagnetic valve to be measured can be adjusted;

[0017] S4, the positive line is drawn from the power supply and welded to the top end of the contacts on the left and right contact point plates in turn;

[0018] S5, the negative line is drawn from the power supply, first passes through the resistor R, and then is welded to the bottom end of the contacts on the left and right contact point plates in turn;

[0019] S6, channel 1 collects the voltage value between the two ends of the resistor R, when the electromagnetic valve is not working, the left end of the contact iron block is in complete contact with the A and B contacts, and the voltage value between the two ends of the resistor R in the oscilloscope channel 1 collection circuit is 5V;

[0020] S7, the upper computer sends a pulse width signal to the electromagnetic valve on the test bench to make the valve core of the electromagnetic valve start to move, the contact iron block is separated from the A and B contacts, and the voltage value between the two ends of the resistor R in the oscilloscope channel 1 collection circuit is 0V;

[0021] S8, when the electromagnetic valve starts to move, the oscilloscope channel 2 starts to collect the pulse width signal of the electromagnetic valve sent by the upper computer;

[0022] S9, when the right end of the contact iron block is in complete contact with the E and F dome contacts, the voltage value collected by the oscilloscope channel 1 is 5V;

[0023] S10, select 100 cycles of collected data and perform average processing to obtain an image of the pulse width of the electromagnetic valve and the voltage value between the two ends of the resistor R;

[0024] S11, processing and analyzing the image to obtain T1 as the delay time of the electromagnetic valve, and T2-T1 as the response time of the electromagnetic valve.

[0025] Further, before processing the analysis image, a spool height-time curve is generated; thus, the curve can be used as a standard reference for the response time of the electromagnetic valve to be tested, facilitating the debugging of the electromagnetic valve in use; the method further comprises:

[0026] Step S11.1, obtaining the reference pixel unit corresponding to the spool in the image before the electromagnetic valve receives the operation instruction;

[0027] Step S11.2, obtaining the dynamic pixel unit corresponding to the spool in the image at any time;

[0028] Step S11.3, taking the reference pixel unit as the zero point of the spool height-time curve, taking the dynamic unit as the vertical axis of the spool height-time curve, and taking the time corresponding to the dynamic pixel unit as the horizontal axis of the spool height-time curve;

[0029] Thus, the response time of the electromagnetic valve and the action time of the spool can be obtained intuitively through the spool height-time curve.

[0030] Advantages

[0031] The testing device and testing method for the delay time and response time of the electromagnetic valve have the following advantages compared with the prior art:

[0032] (1) The technical solution indirectly obtains the delay time and response time of the electromagnetic valve according to the signal condition on the oscilloscope by collecting the pulse width signal sent by the upper computer and the voltage value across the resistor R, and is simple and easy to operate and has high testing precision. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the overall structure of the testing device in the present application.

[0034] Figure 2 is a schematic diagram of the testing device circuit in the disconnected state in the present application.

[0035] Figure 3 is a schematic diagram of the pulse width of the electromagnetic valve and the voltage value across the resistor R in the present application.

[0036] The marks in the drawings are: 1-upper computer, 2-electromagnetic valve control line, 3-pulse width signal line, 4-electromagnetic valve fixing plate, 5-electromagnetic valve fixing bolt, 6-test bench, 7-electromagnetic valve fixing plate fine adjustment bolt, 8-oscilloscope, 9-contact plate fine adjustment bolt, 10-contact iron block, 11-contact, 12-electromagnetic valve, 13-electromagnetic valve spool, 14-spool connecting rod, 15-right contact plate, 16-left contact plate, 17-voltage test line. DETAILED DESCRIPTION

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0038] Example 1:

[0039] like Figures 1-2 As shown, a testing device for the delay time and response time of a solenoid valve includes a test bench 6 and a solenoid valve 12 fixed on the test bench 6 by a fixing plate 4; the solenoid valve 12 is fixedly mounted on the solenoid valve fixing plate 4 by fixing bolts 5; the solenoid valve fixing plate 4 is then fixedly mounted on the test bench 6 by bolts 7.

[0040] The solenoid valve 12 includes a solenoid valve core 13 and a controller. The controller of the solenoid valve 12 is connected to the host computer 1 via a signal line 2. On the test bench 6, a left contact plate 16 and a right contact plate 17 are installed on the side near the solenoid valve core 13. The left contact plate 16 and the right contact plate 17 are made of insulating material. The bottom of the left contact plate 16 and the right contact plate 17 are provided with threaded holes and are installed on the test bench 6 by adjusting bolts 9. The distance from the bottom of the left contact plate 16 and the right contact plate 17 to the test bench 6 can be adjusted by rotating the adjusting bolts 9.

[0041] The left contact plate 16 and the right contact plate 15 are spaced apart. The left contact plate 16 and the right contact plate 15 are respectively provided with an upper contact 11 and a lower contact on the opposite side. Contact A and contact B are fixedly provided on the inner side of the left contact plate 16, and contact E and contact F are fixedly provided on the inner side of the right contact plate 15.

[0042] The solenoid valve core 13 is threadedly connected to a valve core connecting rod 14. A contact iron block 10, which contacts the contact point 11, is fixedly mounted on the other end of the valve core connecting rod 14. The contact iron block 10 and the valve core connecting rod 14 are the same entity. The valve core connecting rod 14 is coaxial with the solenoid valve core 13 and is threadedly connected to the valve core. When the left end face of the contact iron block 10 contacts the dome surfaces of contacts A and B, the maximum adjustable distance of the solenoid valve 13 is the distance between the right end face of the contact iron block 10 and the dome surfaces of contacts E and F, and this distance is set as S.

[0043] When the left end of the contact iron block 10 is in complete contact with the A contact and the B contact, the voltage value between the two ends of the R in the channel 1 acquisition circuit of the oscilloscope 8 is 5V; when the right end of the contact iron block 10 is in complete contact with the E contact and the F contact, the voltage value between the two ends of the R in the channel 1 acquisition circuit of the oscilloscope 8 is 5V; when the end surface of the contact iron block 10 is not in contact with the contact, the voltage value between the two ends of the R in the channel 1 acquisition circuit of the oscilloscope 8 is 0V.

[0044] The upper contact and the lower contact are connected to the two ends of the resistor R through the wires 17, that is, the B contact and the F contact are connected to one end of the resistor R through the wires 17, and the A contact and the F contact are connected to the other end of the resistor R after being connected to the power supply through the wires 17; the positive wire of the power supply is led out and welded to the top ends of the A contact and the F contact in sequence, and the negative wire of the power supply is led out, passes through the resistor R first, and is then welded to the bottom ends of the B contact and the F contact in sequence; the end surface of the contact iron block 10 is in complete contact with the dome surface of the contact, and the whole circuit is only conducted when the end surface of the contact iron block 10 is in complete contact with the dome surface of the contact.

[0045] The two ends of the resistor R are connected to the channel 1 of the oscilloscope 8 through the wires 17, and the oscilloscope 8 acquires the voltage value between the two ends of the resistor R through the channel 1. The channel 2 of the oscilloscope 8 is connected to the upper computer 1 through the pulse width signal line 3, and acquires the pulse width signal of the electromagnetic valve 12.

[0046] Embodiment 2

[0047] A testing method of the delay time and the response time of an electromagnetic valve, comprising the following specific steps:

[0048] S1, first, the electromagnetic valve is fixed on the electromagnetic valve fixing plate through bolts, and then the electromagnetic valve fixing plate is fixed on the test bench through bolts;

[0049] S2, the fine adjustment screw at the bottom of the left contact plate is fine adjusted, the height of the left contact plate is adjusted, and the left end surface of the contact iron block is in contact with the dome surfaces of the circuit contacts A and B;

[0050] S3, the fine adjustment screw at the bottom of the right contact plate is fine adjusted, the height of the right contact plate is adjusted, and the right end surface of the contact iron block is in contact with the dome surfaces of the circuit contacts E and F; the distance S required for the electromagnetic valve to be measured can be adjusted.

[0051] S4, the positive wire is led out from the power supply and welded to the top ends of the contacts on the left and right contact plates in sequence;

[0052] S5, the negative wire is led out from the power supply, passes through the resistor R first, and is then welded to the bottom ends of the contacts on the left and right contact plates in sequence;

[0053] S6, the voltage value between the two ends of the resistor R is acquired by the channel 1, when the electromagnetic valve is not working, the left end of the contact iron block is in complete contact with the A and B contacts, and the voltage value between the two ends of the R in the channel 1 acquisition circuit of the oscilloscope is 5V;

[0054] S7, the host computer sends a pulse width signal to the electromagnetic valve on the experiment table, so that the electromagnetic valve core starts to move, the contact iron block is separated from the A and B contacts, and the oscilloscope channel 1 collects the voltage value between the two ends of the resistor R as 0V;

[0055] S8, when the electromagnetic valve starts to move, the oscilloscope channel 2 starts to collect the pulse width signal of the electromagnetic valve sent by the host computer;

[0056] S9, when the right end of the contact iron block is in complete contact with the E and F dome contacts, the voltage value collected by the oscilloscope channel 1 is 5V;

[0057] S10, 100 cycles of collected data are selected and averaged to obtain an image of the pulse width of the electromagnetic valve and the voltage value between the two ends of the resistor R;

[0058] S11, processing and analyzing the image, T1 is the delay time of the electromagnetic valve, and T2-T1 is the response time of the electromagnetic valve.

[0059] It can be understood that the electromagnetic valve has a certain response time when receiving a work instruction, and the valve core is stationary during the response time; and after the response time elapses, the valve core starts to extend until it extends to the maximum value. In order to measure the response time of the electromagnetic valve, in the embodiment, the time point at which the host computer sends a pulse width signal to control the electromagnetic valve is obtained by the host computer, and the time point at which the change of the voltage between the two ends of the resistor R is obtained by using the oscilloscope, and the two time points are subtracted, so that the response time is obtained; by capturing the change of the voltage between the two ends of the resistor R, the time when the valve core starts to extend is obtained, and the change of the voltage value is compared, so that the time when the response time elapses is obtained, thereby realizing the measurement of the response time.

[0060] Before processing and analyzing the image, a valve core height-time curve is generated; thus, the curve can be used as a standard reference for the response time of the electromagnetic valve to be measured, facilitating the debugging of the electromagnetic valve in use; the method further comprises:

[0061] Step S11.1, obtaining a reference pixel unit corresponding to the valve core in the image before the electromagnetic valve receives a work instruction;

[0062] Step S11.2, obtaining a dynamic pixel unit corresponding to the valve core in the image at any time;

[0063] Step S11.3, taking the reference pixel unit as the zero point of the valve core height-time curve, taking the dynamic unit as the vertical axis of the valve core height-time curve, and taking the time corresponding to the dynamic pixel unit as the horizontal axis of the valve core height-time curve;

[0064] Thus, the response time of the electromagnetic valve and the action time of the valve core can be intuitively obtained through the valve core height-time curve.

Claims

1. A testing device for the delay time and response time of a solenoid valve, comprising a test bench (6) and a solenoid valve (12) fixed on the test bench (6) by a fixing plate (4), wherein the solenoid valve (12) comprises a solenoid valve core (13) and a controller, and the controller of the solenoid valve (12) is connected to a host computer (1) via a signal line (2); characterized in that: The test bench (6) is provided with a left contact plate (16) and a right contact plate (15) on the side close to the electromagnetic valve spool (13), the bottom of the left contact plate (16) and the right contact plate (15) is provided with a threaded hole, and the left contact plate (16) and the right contact plate (15) are installed on the test bench (6) through a fine adjustment bolt (9), the distance between the bottom of the left contact plate (16) and the right contact plate (15) and the test bench (6) can be adjusted by rotating the fine adjustment bolt (9); the side opposite to the left contact plate (16) and the right contact plate (15) is provided with an upper contact and a lower contact correspondingly; the electromagnetic valve spool (13) is connected with a spool connecting rod (14) through screw connection, the other end of the spool connecting rod (14) is fixedly provided with a contact iron block (10) which is in contact with the upper contact and the lower contact; the upper contact and the lower contact are connected with the two ends of a resistor R through wires (7) respectively, the two ends of the resistor R are connected with a channel one of an oscilloscope (8) through wires (7) respectively, and the oscilloscope (8) collects the voltage value at the two ends of the resistor R through the channel one; the channel two of the oscilloscope (8) is connected with an upper computer (1) through a pulse width signal line (3), and the pulse width signal of the electromagnetic valve (12) is collected; the left contact plate (16) and the right contact plate (15) are arranged at intervals; an A contact and a B contact are fixedly arranged on the inner side of the left contact plate (16), and an E contact and an F contact are fixedly arranged on the inner side of the right contact plate (15); when the left end surface of the contact iron block (10) is in contact with the dome surface of the A contact and the B contact, the maximum adjustable distance of the electromagnetic valve (12) is the distance between the right end surface of the contact iron block (10) and the dome surface of the E contact and the F contact, and the distance is set as S; the B contact and the F contact are connected with one end of the resistor R through wires, the A contact and the E contact are connected with the other end of the resistor R after being connected with a power supply through wires; the whole circuit is only conducted when the end surface of the contact iron block (10) is completely in contact with the dome surface of the contact; when the left end of the contact iron block (10) is completely in contact with the A contact and the B contact, the voltage value at the two ends of R in the channel one of the oscilloscope (8) is 5V; when the right end of the contact iron block (10) is completely in contact with the E contact and the F contact, the voltage value at the two ends of R in the channel one of the oscilloscope (8) is 5V; when the end surface of the contact iron block (10) is not in contact with the contact, the voltage value at the two ends of R in the channel one of the oscilloscope (8) is 0V; the positive line of the power supply is led out and welded with the top ends of the A contact and the E contact in sequence, the negative line of the power supply is led out, passes through the resistor R first, and then is welded with the bottom ends of the B contact and the F contact in sequence.

2. The device for testing the delay time and response time of a solenoid valve according to claim 1, wherein: The left contact plate (16) and the right contact plate (15) are made of insulating materials.

3. The device of claim 1, wherein: the solenoid valve is a proportional solenoid valve. The contact iron block (10) and the spool connecting rod (14) are the same entity, the spool connecting rod (14) is coaxial with the electromagnetic valve spool (13) and is connected with the valve spool (13) through screw connection.

4. A method for testing the delay time and response time of a solenoid valve, which is used in combination with the testing device for testing the delay time and response time of a solenoid valve according to any one of claims 1 to 3, characterized in that: The method comprises the following specific steps: S1, first, the electromagnetic valve is fixed on the electromagnetic valve fixing plate through a bolt, and then the electromagnetic valve fixing plate is fixed on the test bench through a bolt; S2, fine-tune the fine-tune screw at the bottom of the left contact plate, adjust the height of the left contact plate, so that the left end surface of the contact iron block is in contact with the dome surface of the circuit contacts A and B; S3, fine-tune the fine-tune screw at the bottom of the right contact plate, adjust the height of the right contact plate, so that the right end surface of the contact iron block is in contact with the dome surface of the circuit contacts E and F; the distance S required to be measured by the electromagnetic valve can be adjusted; S4, the positive line is led out from the power supply and welded to the top end of the contacts on the left and right contact plates in turn; S5, the negative line is led out from the power supply, passes through the resistor R first, and then is welded to the bottom end of the contacts on the left and right contact plates in turn; S6, the voltage value across the resistance R in channel one is collected, when the electromagnetic valve is not working, the left end of the contact iron block is in complete contact with the A and B contacts, and the voltage value across the resistance R in the channel one of the oscilloscope is 5V; S7, the pulse width signal is sent to the electromagnetic valve on the experimental table through the upper computer, so that the valve core of the electromagnetic valve starts to move, the contact iron block is separated from the A and B contacts, and the voltage value across the resistance R in the channel one of the oscilloscope is 0V; S8, when the electromagnetic valve starts to move, the channel two of the oscilloscope starts to collect the pulse width signal of the electromagnetic valve sent by the upper computer; S9, when the right end of the contact iron block is in complete contact with the dome contacts E and F, the voltage value collected by the channel one of the oscilloscope is 5V; S10, 100 cycles of collected data are selected and averaged to obtain the image of the pulse width of the electromagnetic valve and the voltage value across the resistance R; S11, the analysis of the image shows that T1 is the delay time of the electromagnetic valve, and T2-T1 is the response time of the electromagnetic valve.

5. The method of claim 4, wherein: the step of applying a voltage to the solenoid valve includes applying a voltage to the solenoid valve for a predetermined period of time; and the step of applying a voltage to the solenoid valve includes applying a voltage to the solenoid valve for a predetermined period of time. Before processing and analyzing the image, a valve core height-time curve is generated; thus, the curve is used as a standard reference for the response time of the electromagnetic valve to be measured, which is convenient for debugging the electromagnetic valve in use; the method further comprises: Step S11.1, obtaining a reference pixel unit corresponding to the valve core in the image before the electromagnetic valve receives a working instruction; Step S11.2, obtaining a dynamic pixel unit corresponding to the valve core in the image at any time; Step S11.3, taking the reference pixel unit as the zero point of the valve core height-time curve, taking the dynamic unit as the vertical axis of the valve core height-time curve, and taking the time corresponding to the dynamic pixel unit as the horizontal axis of the valve core height-time curve; Thus, the response time of the electromagnetic valve and the action time of the valve core are obtained intuitively through the valve core height-time curve.

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