A detection device and method for detecting vibration resistance of an electromagnetic relay for a rolling stock

Abstract

The application relates to the technical field of relay detection, in particular to a detection device and a detection method for the vibration resistance of an electromagnetic relay for a locomotive vehicle. The detection device comprises a platform, a support frame, a guide rail mechanism and a dynamometer. The support frame is L-shaped, the horizontal surface of the support frame is connected with the platform, the platform is used for placing the relay to be detected, the side of the relay armature is placed upward, the vertical surface of the support frame is connected with the guide rail mechanism, the guide rail mechanism comprises a sliding block, the sliding block slides in the vertical direction, the dynamometer is connected with the sliding block, and the probe of the dynamometer is located above the bending position of the armature in the relay. The contact pressure between the armature and the limiting frame is detected, the contact pressure is used as an index for rapidly judging the vibration resistance of the relay, the operation is convenient, the detection is rapid, the detection can be realized piece by piece, and the consistency of product quality is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay detection, in particular to a detection device and method for vibration resistance of an electromagnetic relay for a rolling stock. BACKGROUND

[0002] The vibration and impact generated in the normal operation of the rolling stock mainly come from two aspects: one is the longitudinal impact generated by the difference between the traction force and the braking force of the adjacent two vehicles; the second is the vertical vibration caused by the wheel-rail acting on the wheel and the bogie nodding, which will affect the vehicle equipment. As a key signal controller on the vehicle, the electromagnetic relay will cause the train control equipment to be affected and interfere with the normal operation of the train if the contact instantaneously breaks, so the vibration resistance performance of the electromagnetic relay, i.e. the vibration resistance, is a very important technical index, which directly determines the contact reliability of the product under external vibration load.

[0003] At present, the verification of the vibration resistance of the electromagnetic relay for the rolling stock mainly relies on the vibration impact test, but the vibration impact test has the limitations of less number of times, less quantity and long time consumption, and it is difficult to realize the piece-by-piece inspection of the relay. The number of times is less, i.e. the vibration impact test belongs to type test, which is generally carried out when the design, process, production equipment, etc. are changed, and is not included in the scope of routine inspection. Secondly, the sample quantity is sampled according to the proportion, and it is impossible to realize the mass inspection. The time consumption is long, i.e. the vibration impact test needs to be carried out on the test bench, and the contact breaking state of the relay is monitored at the same time, and the test time is generally 3h~4h, so the test time consumption is long. Based on the limitations of the vibration resistance inspection of the electromagnetic relay for the rolling stock, it is difficult to ensure the consistency and reliability of the product batch quality. SUMMARY

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a detection device and method for the vibration resistance of an electromagnetic relay for a rolling stock, which realizes the detection of the contact pressure of the armature and the limiting frame, takes the contact pressure as an index for quickly judging the vibration resistance of the relay, is convenient to operate, fast to detect, can realize piece-by-piece inspection, and ensures the consistency of the product quality.

[0005] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the present application include:

[0006] A detection device for the vibration resistance of an electromagnetic relay for a rolling stock, comprising a platform, a support frame, a guide rail mechanism, a force gauge, the support frame is L-shaped, the horizontal surface of the support frame is connected with the platform, the platform is used for placing the relay to be detected, the side surface where the armature of the relay is located is placed upward, the vertical surface of the support frame is connected with the guide rail mechanism, the guide rail mechanism comprises a sliding block, the sliding block slides in the vertical direction, the force gauge is connected with the sliding block, and the probe of the force gauge is located above the bending position of the armature in the relay.

[0007] The contact pressure between the armature and the limiting frame is detected by the detection device, and the contact pressure is used as an index for quickly judging the vibration resistance of the relay, which is convenient to operate, fast to detect, and can realize piece-by-piece inspection to ensure the consistency of product quality.

[0008] Further, the platform is n-shaped, and a square slot hole penetrating through the top surface is arranged at the top end of the platform, and when the relay is placed on the platform, the pressure adjusting screw at the bottom of the relay corresponds to the position of the square slot hole.

[0009] By designing the platform as n-shaped and providing the square slot hole, the detection personnel can rotate the pressure adjusting screw on the platform to increase the contact pressure, without the need to take the relay off the device, thereby improving the efficiency.

[0010] Further, a limiting slot is arranged at the top of the platform, and the limiting slot is matched with the shape of the relay base and the yoke.

[0011] By arranging the limiting slot, the position of the relay placed on the platform is limited, so that the shaking during the test does not affect the test result.

[0012] Further, the guide rail mechanism further comprises a guide rail base, a guide rail and a guide rail spring, one side of the guide rail base is connected with the support frame, and the other side is fixed with a vertical guide rail, the guide rail spring and the sliding block are sleeved on the guide rail, and the sliding block abuts against the upper end of the guide rail spring.

[0013] By the specific arrangement of the guide rail mechanism, the dynamometer can stably slide, and the tester can make the dynamometer return to the initial position by releasing the hand.

[0014] Further, it further comprises a connecting frame, the dynamometer and the sliding block are connected through the connecting frame, the connecting frame is n-shaped, one side of the connecting frame is connected with the sliding block, and the other side is connected with the dynamometer.

[0015] By arranging the connecting frame, the dynamometer and the guide rail mechanism are at a certain distance, which facilitates the alignment of the dynamometer probe with the test position.

[0016] A detection method for the vibration resistance of an electromagnetic relay for rolling stock, which adopts a detection device for the vibration resistance of an electromagnetic relay for rolling stock, comprising the following steps:

[0017] S1, placing the relay to be detected on the platform so that the dynamometer probe is aligned directly above the bent part of the armature of the relay;

[0018] S2, pushing the dynamometer to slide downward in the vertical direction, reading the pressure value of the dynamometer, and observing whether the contact position of the limiting frame and the armature of the relay is separated;

[0019] S3, if the pressure value reaches the set value, the contact position is still not separated, the relay is marked as unqualified; if the contact position is separated, the relay is marked as qualified;

[0020] S4, remove the relay, complete the test.

[0021] By designing the detection method of the above detection device, the detection is fast, and the piece-by-piece inspection can be realized to ensure the consistency of product quality.

[0022] Further, in step S3, the unqualified relay is tightened with the pressure adjusting screw at the bottom, and re-detected in step S1.

[0023] The unqualified relay is retested after adjustment, without additional device to handle unqualified products, improving efficiency and improving the consistency of product quality.

[0024] Further, the top of the platform is provided with a square slot hole penetrating the top surface, and when the relay is placed on the platform, the pressure adjusting screw at the bottom of the relay corresponds to the position of the square slot hole. In step S3, the unqualified relay is tightened with the pressure adjusting screw at the bottom in the square slot hole, and re-detected in step S2.

[0025] By designing the platform as n-shaped and providing a square slot hole, the detection personnel rotates the pressure adjusting screw on the platform to increase the contact pressure, without taking the relay off the device, further improving the efficiency.

[0026] The beneficial effects of the present application are:

[0027] The detection device for the vibration resistance of the electromagnetic relay for rolling stock realizes the detection of the contact pressure of the armature and the limiting frame, and uses the contact pressure as an index for quickly judging the vibration resistance of the relay, which is convenient to operate. A detection method for the vibration resistance of the electromagnetic relay for rolling stock is designed, which is fast in detection and can realize piece-by-piece inspection to ensure the consistency of product quality. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The figure is a structural schematic diagram of the detection device for the vibration resistance of the electromagnetic relay for rolling stock;

[0029] Figure 2 The figure is a side view of the detection device for the vibration resistance of the electromagnetic relay for rolling stock;

[0030] Figure 3 The figure is an exploded structural schematic diagram of the relay and the platform;

[0031] Figure 4 The figure is a bottom view of the exploded structural schematic diagram of the relay and the platform;

[0032] Figure 5 A schematic diagram of a relay system structure of the present application;

[0033] Figure 6 A schematic diagram for verifying the dynamics model of the relay system;

[0034] Figure 7 A curve of acceleration spectral density (ASD);

[0035] Figure 8 A curve of relative displacement response spectrum (PSD) of the moving and static contacts.

[0036] In the figure: 1, support frame; 2, guide rail base; 3, connecting frame; 4, force gauge; 4-1, force gauge probe; 5, relay; 5-1, limit frame; 5-2, contact position; 5-3, armature; 5-4, yoke; 5-5, relay base; 5-6, pressure spring; 5-7, pressure adjusting screw; 5-8, moving contact; 5-9, reset leaf; 5-10, coil; 5-11, static contact; 6, platform; 6-1, square slot hole; 7, sliding block; 8, guide rail spring; 9, guide rail. DETAILED DESCRIPTION

[0037] In order to better explain the present application, so as to be understood, the present application is described in detail below by specific embodiments in combination with the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more clearly, thoroughly understood, and the scope of the present application can be completely conveyed to those skilled in the art.

[0038] As Figures 1-4 shown, a detection device for the vibration resistance performance of an electromagnetic relay for rolling stock, comprising a platform 6, a support frame 1, a guide rail mechanism, a force gauge 4, the support frame 1 is L-shaped, the horizontal plane of the support frame 1 is connected with the platform 6, the platform 6 is used for placing the relay 5 to be detected, the side on which the armature 5-3 of the relay 5 is located is placed upward, the vertical plane of the support frame 1 is connected with the guide rail mechanism, the guide rail mechanism comprises a sliding block 7, the sliding block 7 slides in the vertical direction, the force gauge 4 is connected with the sliding block 7, and the probe of the force gauge 4 is located above the bending position of the armature 5-3 in the relay 5.

[0039] The detection device is designed to realize the detection of the contact pressure of the armature 5-3 and the limit frame 5-1, and the contact pressure is used as an index for quickly judging the vibration resistance performance of the relay 5, so that the operation is convenient, the detection is fast, the piece-by-piece inspection can be realized, and the consistency of product quality is ensured.

[0040] Specifically, the platform 6 is n-shaped, and a square slot hole 6-1 is arranged on the top of the platform 6, and when the relay 5 is placed on the platform 6, the pressure adjusting screw 5-7 at the bottom of the relay 5 corresponds to the position of the square slot hole 6-1. In this embodiment, the size of the square slot hole 6-1 is 30mm*40mm.

[0041] By designing the platform 6 as n-shaped and providing the square slot hole 6-1, the tester can rotate the pressure adjusting screw 5-7 on the platform 6 to increase the contact pressure, without taking the relay 5 off the device, thereby improving the efficiency.

[0042] The pressure adjusting screw 5-7 is used to adjust the deformation of the pressure spring 5-6 in the relay 5 to change the contact pressure of the armature 5-3 assembly and the limiting frame 5-1.

[0043] Specifically, the top of the platform 6 is provided with a limiting slot which matches the shape of the relay base 5-5 and the yoke 5-4.

[0044] By providing the limiting slot, the position of the relay 5 placed on the platform 6 is limited, so that the shaking during the test does not affect the test results.

[0045] Specifically, the guide rail mechanism further comprises a guide rail base 2, a guide rail 9 and a guide rail spring 8, one side of the guide rail base 2 is connected with the support frame 1, and the other side is fixed with a vertical guide rail 9, the guide rail spring 8 and the sliding block 7 are sleeved on the guide rail 9, and the sliding block 7 abuts against the upper end of the guide rail spring 8.

[0046] By the specific arrangement of the guide rail 9 mechanism, the dynamometer 4 can slide stably, and the tester can make the dynamometer 4 return to the initial position by releasing the hand.

[0047] Specifically, it further comprises a connecting frame 3, the dynamometer 4 and the sliding block 7 are connected through the connecting frame 3, the connecting frame 3 is n-shaped, one side of the connecting frame 3 is connected with the sliding block 7, and the other side is connected with the dynamometer 4.

[0048] By providing the connecting frame 3, the dynamometer 4 is kept a certain distance from the guide rail mechanism, so that the dynamometer probe 4-1 can be aligned with the test position.

[0049] A detection method for the vibration resistance of an electromagnetic relay for a rolling stock adopts a detection device for the vibration resistance of an electromagnetic relay for a rolling stock, comprising the following steps:

[0050] S1, placing the relay 5 to be detected on the platform 6 so that the dynamometer probe 4-1 is aligned directly above the bending part of the armature 5-3 of the relay 5;

[0051] S2, push the dynamometer 4 to slide along the vertical direction downward, and read the pressure value of the dynamometer 4, and observe whether the contact position 5-2 of the limit stop 5-1 and the armature 5-3 is separated or not;

[0052] S3, if the pressure value reaches the set value, the contact position 5-2 is still not separated, and the relay 5 is marked as unqualified; if the contact position 5-2 is separated, the relay 5 is marked as qualified;

[0053] S4, remove the relay 5, and complete the test.

[0054] By designing the detection method of the above detection device, the detection is fast, and the product quality consistency can be ensured.

[0055] Specifically, in the step S3, the unqualified relay 5 is tightened with the pressure adjusting screw 5-7 at the bottom, and re-detected in the step S1.

[0056] The unqualified product is retested after adjustment, without additional device to handle unqualified products, improving the efficiency and the consistency of product quality.

[0057] Specifically, the platform 6 is provided with a square slot hole 6-1 penetrating the top surface, and when the relay 5 is placed on the platform 6, the pressure adjusting screw 5-7 at the bottom of the relay 5 corresponds to the position of the square slot hole 6-1, and in the step S3, the unqualified relay 5 is tightened with the pressure adjusting screw 5-7 at the bottom in the square slot hole 6-1, and re-detected in the step S2.

[0058] By designing the platform 6 as n-shaped and provided with the square slot hole 6-1, the detection personnel tightens the pressure adjusting screw 5-7 on the platform 6 to increase the contact pressure, without taking the relay 5 off the device, further improving the efficiency.

[0059] Measuring the contact pressure of the limit stop 5-1 and the armature 5-3 can be used to judge the theoretical rationality of the relay vibration resistance performance, which is proved as follows:

[0060] (1) Simplified model of relay

[0061] The relay system includes two states, namely the attracted state and the released state. The vibration resistance performance of the relay in the attracted state and the released state is different. Generally, the vibration resistance in the attracted state is better than that in the released state, and improving the vibration resistance of the relay mainly improves the vibration resistance in the released state. Taking a certain type of locomotive relay as an example, the system structure in the released state is shown in Figure 5 .

[0062] Figure 5In the relay system, the electromagnetic system includes the static yoke 5-4 and coil 5-10 part, the dynamic armature 5-3 and the reset spring 5-9. The contact system includes the relay 5 base and the moving contact 5-8 and the static contact 5-11. When the coil 5-10 is excited, the armature 5-3 is attracted under the electromagnetic force, so that the moving contact 5-8 is connected or disconnected with the static contact 5-11.

[0063] (2) System dynamics modeling

[0064] The static contact 5-11 and the reset spring 5-9 are elastic members, which can be regarded as a single degree of freedom spring-mass system. Since there is a limiting frame 5-1 in the system, the system balance state after the armature 5-3 contacts with the limiting frame 5-1 determines the vibration resistance performance of the system. Ignoring the system damping, the armature 5-3 is equivalent to a rigid body plane motion, and the vibration system is as shown in FIG. 5. Figure 6

[0065] Figure 6 In the vibration system shown in FIG. 5, F 1 is equivalent to the elastic force of the reset spring 5-9 on the armature 5-3, F 2 is equivalent to the elastic force of the pressure spring 5-6 on the armature 5-3, F 3 is equivalent to the elastic force of the static contact 5-11 on the armature 5-3, and the elastic coefficients are k 1, k 2 and k 3 respectively. The rigid body rotates around the hinge A , the center of mass is at D , and the gravity mg .

[0066] Assuming that the angle of rotation of the rigid body around the A point is , then according to the D'Alembert principle, the torque balance equation is:

[0067] (1)

[0068] According to the Taylor expansion formula, if , then formula (1) can be written as:

[0069] (2)

[0070] The general solution of the vibration differential equation is:

[0071] (3)

[0072] In the formula, , ​​

[0073] From equation (3) we have:

[0074] (4)

[0075] where: ωi represents the natural frequency of the mode shape; φi represents the initial phase angle; ei represents the mode shape vector independent of time t. t Substituting equations (3) and (4) into equation (2) we have:

[0076]

[0077] (5)

[0078] Assume:

[0079]

[0080] Then equation (5) can be written as

[0081] (6)

[0082] Equation (6) is called the characteristic equation of the vibration system, and its eigenvalues and eigenvectors correspond to the square of the natural frequency and the mode shape of the vibration, respectively.

[0083] From differential equation (2) we have the natural frequency of the system:

[0084] (7)

[0085] When the relay 5 is in the released state, assume that the pressure springs 5-6 are all in the stressed state, k 1、 k 2、 k 3 the deformation of the pressure springs 5-6 is respectively: 、 、 .

[0086] Assume are all less than , then 、 、 , the equilibrium moment equation of the rigid body is:

[0087] (8)

[0088] According to equation (8), equation (7) can be converted to:

[0089]

[0090] ​ (9)

[0091] Therefore, the system is proportional to the contact pressure of the armature 5-3 and the limit frame 5-1 in the vertical self-vibration frequency, increasing the contact pressure helps to improve the vertical self-vibration frequency of the system, which is an effective means to predict the vibration resistance performance of the relay 5 system.

[0092] According to the device and method shown in the application, a relay 5 is selected, in which the contact position 5-2 between the limit frame 5-1 and the armature 5-3 does not separate when the contact pressure is 0.005 N; and a second relay 5 is selected, in which the contact position 5-2 between the limit frame 5-1 and the armature 5-3 does not separate when the contact pressure is 1 N.

[0093] According to the simulation long-life test conditions of the IEC 61373:1999 standard "Railway Rolling Stock Equipment Vibration and Impact Test", referring to the requirements of Class 1 B equipment, the frequency range is 5-150 Hz, and the excitation acceleration response spectrum curve is as shown in Figure 7 .

[0094] Under the random vibration environment, the displacement response (PSD) between the moving contact 5-8 and the static contact 5-11 is extracted, as shown in Figure 8 . According to the displacement response spectrum, when the contact pressure is 0.005 N, the relative displacement response amplitude between the moving contact and the static contact is significantly higher than when the contact pressure is 1 N, which indicates that increasing the contact pressure will reduce the response amplitude of random vibration.

[0095] Observe the making and breaking state between the moving contact 5-8 and the static contact 5-11, when the contact pressure is 0.005 N, the moving contact 5-8 and the static contact 5-11 separate, indicating that it does not pass the random vibration test; when the contact pressure is 1 N, the moving contact 5-8 and the static contact 5-11 do not separate, and the contact state is stable, indicating that it passes the random vibration test.

[0096] Therefore, testing the contact pressure between the armature 5-3 and the limit frame 5-1 can be used as a criterion for the vibration resistance performance of the relay 5 in the production process.

[0097] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A device for detecting the vibration resistance characteristics of electromagnetic relays used in locomotives and rolling stock, characterized in that, Including platform (6), support frame (1), guide rail mechanism, dynamometer (4), the support frame (1) is L-shaped, the horizontal plane of the support frame (1) is connected with platform (6), the platform (6) is used to place the relay (5) to be detected, the side of the armature (5-3) of the relay (5) is placed upwards, the vertical plane of the support frame (1) is connected with guide rail mechanism, the guide rail mechanism includes slider (7), the slider (7) slides along the vertical direction, the dynamometer (4) is connected with slider (7), the probe of the dynamometer (4) is located above the bending place of the armature (5-3) in the relay (5); The platform (6) is n-shaped, a square slot hole (6-1) is arranged on the top of the platform (6), when the relay (5) is placed on the platform (6), the pressure adjusting screw (5-7) at the bottom of the relay (5) corresponds to the position of the square slot hole (6-1).

2. A device for detecting the vibration resistance of an electromagnetic relay for a rolling stock according to claim 1, characterized in that: The top of the platform (6) is provided with a limiting groove, and the limiting groove is matched with the shape of the relay base (5-5) and the yoke (5-4).

3. A device for detecting the vibration resistance of an electromagnetic relay for a rolling stock according to claim 1, characterized in that: The guide rail mechanism further includes a guide rail base (2), a guide rail (9) and a guide rail spring (8), one side of the guide rail base (2) is connected with the support frame (1), the other side is fixed with a vertical guide rail (9), the guide rail spring (8) and the slider (7) are sleeved on the guide rail (9), and the slider (7) abuts against the upper end of the guide rail spring (8).

4. A device for detecting the vibration resistance of an electromagnetic relay for a rolling stock according to claim 1, characterized in that: Further comprising a connecting frame (3), the dynamometer (4) is connected with the slider (7) through the connecting frame (3), the connecting frame (3) is n-shaped, one side of the connecting frame (3) is connected with the slider (7), and the other side is connected with the dynamometer (4).

5. A method of detecting a vibration resistance characteristic of an electromagnetic relay for a rolling stock, characterized by, The detection device for the vibration resistance of the electromagnetic relay for rolling stock adopts any one of the detection devices for the vibration resistance of the electromagnetic relay for rolling stock according to claims 1-4, and includes the following steps: S1, place the relay (5) to be detected on the platform (6) so that the probe (4-1) of the dynamometer is aligned above the bending place of the armature (5-3) of the relay (5); S2, push the dynamometer (4) to slide downward along the vertical direction, read the pressure value of the dynamometer (4), and observe whether the contact position (5-2) between the limiting frame (5-1) of the relay (5) and the armature (5-3) is separated; S3, if the pressure value reaches the set value and the contact position (5-2) is still not separated, the relay (5) is marked as qualified; if the contact position (5-2) is separated, the relay (5) is marked as unqualified, and the unqualified relay (5) is tightened with the pressure adjusting screw (5-7) at the bottom thereof for re-detection; S4, remove the relay (5) to complete the test.

6. A method of detecting the vibration resistance characteristics of an electromagnetic relay for a rolling stock according to claim 5, characterized by: In the step S3, the unqualified relay (5) is tightened with the pressure adjusting screw (5-7) at the bottom thereof to enter the step S1 for re-detection.

7. A method of detecting the vibration resistance characteristics of an electromagnetic relay for a rolling stock according to claim 5, characterized by: The platform (6) top end is equipped with square slot hole (6-1) through the top surface, when the relay (5) is placed on the platform (6), the pressure regulating screw (5-7) at the bottom of the relay (5) corresponds to the position of the square slot hole (6-1), the relay (5) that is not qualified in the step S3 is screwed at the bottom of the pressure regulating screw (5-7) in the square slot hole (6-1), and enters the step S2 for re-detection.

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