Fracture inspection device of elastic strip fatigue testing machine

Abstract

The utility model relates to the field of railway elastic strip detection, and discloses an elastic strip fatigue testing machine fracture inspection device which comprises a sample seat, the top end of the sample seat is fixedly connected with a fixing plate through a fixing bolt, an annular sliding groove is formed in the bottom face of the fixing plate, and a fillet sliding groove is formed in the top face of the fixing plate. A proximity switch is arranged in the fillet sliding groove and located above the highest point of the test elastic strip, a limiting block is arranged at the top end of the sample base, and the test elastic strip is placed in the limiting block. According to the utility model, by arranging the sample seat, the fixed plate and the proximity switch, the position of the proximity switch is opposite to the position of the high point of the test elastic strip, when fatigue detection is carried out until the test elastic strip is broken, the high point on one side of the test elastic strip leaves the measurement range of the proximity switch, and at the moment, the proximity switch cannot detect the high point of the test elastic strip, so that the test is finished; and the detection accuracy is high.

Description

Technical Field

[0001] The utility model relates to the field of railway spring bar detection, in particular to a fracture detection device for a spring bar fatigue testing machine. Background Art

[0002] High-speed rail is the main means of transportation in my country, and railway spring clips are important components related to the safe operation of high-speed rail. Railway spring clips are used to buckle railway tracks. The bending and twisting deformation of the spring clips generate buckling pressure, thereby ensuring a reliable connection between the rails and ensuring the safety of rail vehicles. On the railway track, there will be multiple spring clips within one meter (the specific number is related to the specific spring clips), and they need to be replaced, so the use of spring clips is very large.

[0003] Since the contact between train wheels and rails is rigid, vibration is inevitable. The special elastic structure of the spring bar enables it to absorb the impact energy generated by the passing vehicle, achieving the effect of shock absorption. Therefore, the vibration resistance of railway bounce is extremely important. For this purpose, a spring bar fatigue tester fracture inspection device is required.

[0004] Currently, when conducting a 1000Hz high-frequency fatigue test on railway spring clips, the clips are usually placed on a fatigue testing machine and subjected to high-frequency, low-amplitude cyclic loading to detect the fatigue performance of the material under high stress until the clips break and the test data is recorded. Currently, railway spring clip fracture detection is usually performed manually or through visual solutions using video recognition. However, in actual use, when the clip breaks, flying chips may fly out, and manual recognition may be dangerous. Video recognition is expensive and has low recognition accuracy. Therefore, a fracture inspection device for a spring clip fatigue testing machine is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a fracture detection device for a spring bar fatigue testing machine, which aims to improve the problems of high cost and low recognition accuracy of spring bar fracture detection in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a fracture inspection device for a spring bar fatigue testing machine, comprising a specimen seat, the top of the specimen seat is fixedly connected to a fixed plate by a fixing bolt, the fixed plate is arranged in a Z shape with two horizontal plates inner sides fixedly connected by a vertical plate, an annular slide groove is arranged on the bottom surface of the fixed plate, four groups of annular slide grooves are arranged, and the four groups of annular slide grooves are equidistantly distributed on the bottom surface of the fixed plate and form a circle, a rounded slide groove is arranged on the top surface of the fixed plate, a proximity switch is arranged inside the rounded slide groove, and the proximity switch is located above the highest point of the test spring bar, a limit block is arranged on the top of the specimen seat, and a test spring bar is placed inside the limit block.

[0007] As a further description of the above technical solution:

[0008] The proximity switch includes a switch housing, the outer periphery of which is slidably connected to the inside of the rounded sliding groove, a threaded groove is provided on the outer periphery of the switch housing, a lock nut is threadedly connected to the outer periphery of the threaded groove, and a sensor is provided at the bottom of the switch housing.

[0009] As a further description of the above technical solution:

[0010] A gasket is provided between the inner wall of the top end of the fixing bolt and the inner wall of the bottom end of the fixing plate.

[0011] As a further description of the above technical solution:

[0012] The outer periphery of the fixing bolt is slidably connected to the inside of the annular sliding groove.

[0013] As a further description of the above technical solution:

[0014] The front end of the test spring bar is placed on the top end of the sample seat.

[0015] As a further description of the above technical solution:

[0016] Two groups of anti-loosening nuts are provided, and the inner sides of the two groups of anti-loosening nuts are in contact with the upper and lower sides of the horizontal plate above the fixing plate.

[0017] As a further description of the above technical solution:

[0018] The sensor is located above the highest point of the test spring bar.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the present invention, by arranging the specimen holder, the fixing plate and the proximity switch, the position of the proximity switch is made relative to the high point of the test spring bar. When fatigue testing is performed until the test spring bar breaks, the high point of one side of the test spring bar leaves the measuring range of the proximity switch. At this time, the proximity switch cannot detect the high point of the test spring bar, thereby terminating the test and achieving high detection accuracy.

[0021] 2. In the present invention, by providing an annular chute and a rounded chute and loosening the fixing bolts and the anti-loosening nut, the position of the proximity switch can be adjusted so that the proximity switch can be aligned with the high point of the test spring bar, thereby conveniently detecting test spring bars of different models and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall front view of a fracture inspection device for a spring bar fatigue testing machine proposed in the present invention;

[0023] Figure 2 The fixed plate left side schematic view of a spring strip fatigue testing machine fracture inspection device is provided in the utility model;

[0024] Figure 3 The proximity switch front view of a spring strip fatigue testing machine fracture inspection device is provided in the utility model.

[0025] Legend:

[0026] 1, sample seat; 2, fixed bolt; 3, gasket; 4, fixed plate; 5, annular sliding slot; 6, round corner sliding slot; 7, proximity switch; 71, switch housing; 72, threaded groove; 73, lock nut; 74, sensor; 8, limit block; 9, test spring strip. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Reference Figure 1-Figure 2The utility model provides an embodiment: a kind of spring bar fatigue testing machine fracture inspection device, including the sample seat 1 of fixed and support equipment, the bottom of sample seat 1 is fixed with the fatigue testing machine being set outside, and the top end of sample seat 1 is fixedly connected with fixed plate 4 by fixed bolt 2, and the inner wall between the top end of fixed bolt 2 and the inner wall of the bottom of fixed plate 4 is provided with gasket 3, gasket 3 can increase the contact area between fixed plate 4 and fixed bolt 2, so that fixed plate 4 can be stably connected with sample seat 1, and fixed plate 4 is set to Z type that two inner sides of horizontal plate are fixedly connected by a vertical plate, so that there is space below fixed plate 4 to place sample, and the bottom surface of fixed plate 4 is provided with annular slide groove 5, the annular slide groove 5 is provided with four groups, and the bottom surface of fixed plate 4 is circularly equidistantly distributed and surrounded by four groups of annular slide groove 5, and fixed bolt 2 is provided with four groups, and each group of fixed bolt 2 is slidably connected in the inside of one group of annular slide groove 5, and rotating fixed plate 4 can make fixed plate 4 rotate along the center of the circle surrounded by annular slide groove 5, at this time, fixed bolt 2 can rotate along annular slide groove 5, and the top surface of fixed plate 4 is provided with round corner slide groove 6, and proximity switch 7 is arranged in the inside of round corner slide groove 6, and proximity switch 7 can slide along the inner wall of round corner slide groove 6 and be fixed at specified position, so as to adjust the position of proximity switch 7, and proximity switch 7 can detect the position without directly contacting the measured object. The top end of sample seat 1 is provided with limit block 8, and test spring bar 9 is placed in the inside of limit block 8, and the front end of test spring bar 9 is placed on the top end of sample seat 1, when fatigue testing machine starts to work, fatigue testing machine can carry out high-frequency, low-amplitude cyclic vibration load on the middle part of test spring bar 9 until test spring bar 9 breaks.

[0029] Referring to Figure 1 and Figure 3 , proximity switch 7 includes switch housing 71 bearing and fixing equipment, and switch housing 71 is slidably connected in the inside of round corner slide groove 6, so as to adjust the position of proximity switch 7. Threaded groove 72 is formed in the outer periphery of switch housing 71, and locknut 73 having a fixed clamping function is threadedly connected to the outer periphery of threaded groove 72, and locknut 73 is provided with two groups, and the inner side of two groups of locknut 73 is in contact with the upper and lower sides of the upper horizontal plate of fixed plate 4, and the position of locknut 73 clamping fixed plate 4 is adjusted, so that the height of the bottom of proximity switch 7 can be adjusted, and sensor 74 is arranged at the bottom of switch housing 71, and sensor 74 is located above the highest point of test spring bar 9, when test spring bar 9 breaks due to high-frequency vibration, the high point of test spring bar 9 is out of the measurement range of sensor 74, and a signal is sent to the test system, so as to end the test.

[0030] Working Principle: To test the test spring bar 9, center the test spring bar 9 on the limit block 8 and loosen the fixing bolt 2. Then, rotate the fixing plate 4 so that it rotates along the center of the circle formed by the annular groove 5 to adjust the position of the proximity switch 7. Then, rotate the locknut 73 to slide the proximity switch 7 so that it is aligned with the highest point of the test spring bar 9. Then, rotate the upper locknut 73 to adjust the position of the sensor 74 so that it is close to the highest point of the test spring bar 9 but not in contact with it. Then, rotate the lower locknut 73 to secure the proximity switch 7. This allows testing of test spring bars 9 of different sizes. The fatigue testing machine is turned on and subjected to a high-frequency, low-amplitude cyclic vibration load on the middle portion of the test spring bar 9. During the test, the proximity switch 7 monitors the highest point of the test spring bar 9 in real time and sends a signal to the 1000Hz spring bar fatigue testing machine system at regular intervals to indicate that both highest points of the test spring bar 9 are within the measurement range of the proximity switch 7. When the specimen breaks, one of the two high points of the test spring bar 9 will inevitably be out of the measuring range of the proximity switch 7. At this time, the proximity switch 7 sends a signal to the 1000Hz spring bar fatigue testing machine system, and the host stops according to the signal to complete the test.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fracture inspection device for a spring bar fatigue testing machine, comprising a specimen holder (1), characterized in that: The top of the sample holder (1) is fixedly connected to a fixed plate (4) by a fixing bolt (2), and the fixed plate (4) is set to a Z shape with two horizontal plates fixedly connected by a vertical plate on the inner side. The bottom surface of the fixed plate (4) is provided with an annular slide groove (5), and the annular slide groove (5) is provided in four groups. The four groups of annular slide grooves (5) are equidistantly distributed on the bottom surface of the fixed plate (4) and form a circle. The top surface of the fixed plate (4) is provided with a rounded slide groove (6), and a proximity switch (7) is provided inside the rounded slide groove (6). The proximity switch (7) is located above the highest point of the test spring bar (9). A limit block (8) is provided at the top of the sample holder (1), and a test spring bar (9) is placed inside the limit block (8).

2. The fracture inspection device for a spring bar fatigue testing machine according to claim 1, characterized in that: The proximity switch (7) comprises a switch housing (71), the outer periphery of the switch housing (71) being slidably connected to the interior of the rounded corner chute (6), a threaded groove (72) being provided on the outer periphery of the switch housing (71), a locking nut (73) being threadedly connected to the outer periphery of the threaded groove (72), and a sensor (74) being provided at the bottom of the switch housing (71).

3. The fracture inspection device for a spring bar fatigue testing machine according to claim 1, characterized in that: A gasket (3) is provided between the inner wall of the top end of the fixing bolt (2) and the inner wall of the bottom end of the fixing plate (4).

4. The fracture inspection device for a spring bar fatigue testing machine according to claim 1, characterized in that: The outer periphery of the fixing bolt (2) is slidably connected to the inside of the annular sliding groove (5).

5. The fracture inspection device for a spring bar fatigue testing machine according to claim 1, characterized in that: The front end of the test spring bar (9) is placed on the top end of the sample holder (1).

6. The fracture inspection device for a spring bar fatigue testing machine according to claim 2, characterized in that: Two groups of anti-loosening nuts (73) are provided, and the inner sides of the two groups of anti-loosening nuts (73) are in contact with the upper and lower sides of the horizontal plate above the fixing plate (4).

7. The fracture inspection device for a spring bar fatigue testing machine according to claim 2, characterized in that: The sensor (74) is located above the highest point of the test spring bar (9).

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