Acoustic emission sensor clamp for steel rail online monitoring

Abstract

The utility model discloses an acoustic emission sensor clamp for steel rail on-line monitoring, which comprises a clamp body, connecting rod mechanisms are respectively arranged on two sides of the clamp body, the bottom of each connecting rod mechanism is connected with a magnetic attraction seat, the clamp body is provided with a clamp inner cavity, a piston rod is vertically arranged in the clamp inner cavity, and the lower end of the piston rod is connected with a piston. The piston rod is sleeved with a telescopic spring, the bottom of the piston is connected with an acoustic emission sensor, the bottom of the clamp body is connected with a connecting disc, an air extracting pump is arranged outside the clamp body, and the air extracting pump is communicated with an inner cavity of the connecting disc and a cavity, located below the piston, in the inner cavity of the clamp through pipelines. According to the acoustic emission sensor clamp, the acoustic emission sensor can be fixedly installed on the side face of the rail web of the steel rail, maintenance cost is low, adverse effects on a steel rail circuit are avoided, the structure of the steel rail cannot be damaged, the steel rail can be detected in an all-weather mode, and the acoustic emission sensor clamp is simple in structure, convenient to disassemble and assemble and firm in installation.

Description

Technical Field

[0001] The utility model relates to an acoustic emission sensor fixture for on-line monitoring of steel rails, belonging to the technical field of steel rail defect detection. Background Art

[0002] China's railway has developed rapidly in recent years and is booming. As an important part of the railway, steel rails are an important guarantee for the safe operation of vehicles. During the operation of steel rails, they are often affected by various factors such as environmental factors and human factors and break. The breakage of steel rails usually brings huge potential safety hazards to railway operation. In order to ensure the efficient and safe operation of the railway, it is crucial to monitor the state of railway steel rails in real time and accurately.

[0003] Currently, an acoustic emission sensor is mainly installed and fixed on the steel rail to be detected, and the acoustic emission sensor is used to detect the defects of the steel rail in real time. Therefore, one of the keys to realizing the efficient detection of steel rail defects lies in the fixed connection between the acoustic emission sensor and the steel rail. Currently, a fixture is mainly used to install and fix the acoustic emission sensor on the steel rail. Specifically: first, the fixture is fixed on the steel rail, and then the acoustic emission sensor is installed on the fixture and the acoustic emission sensor is in contact with the surface of the steel rail. The fixing methods of the fixture include hydraulic fixing, electromagnetic fixing, and fastener fixing. Among them, electromagnetic fixing is likely to have an adverse impact on the normal operation of the steel rail circuit, thus interfering with the safety operation signal of the train; hydraulic fixing may face a leakage risk in practical applications, and the maintenance cost is relatively high.

[0004] Fastener fixing mainly uses fasteners such as screws, bolts, and nuts to fix the fixture on the steel rail. Traditional fastener fixing is to first drill holes in the steel rail, and then pass the screw or bolt through the holes, so that the fixture is fixed on the steel rail. The drilling operation will inevitably damage the steel rail structure. Since the steel rail has integrity and indestructibility, the fixture that needs to be drilled is not suitable for steel rail detection.

[0005] Patent CN202020384648.4 discloses an orbital detection fixture, which includes a fixture body and a fixing member relatively installed on both sides of the rail bottom through the fixture body slot and the fixing member slot. The lower part of the fixing member is provided with a connecting screw rod with one end thereof being a quick-connect structure, and a pin passing through the fixing member and the connecting screw rod is also provided on the fixing member. The other end of the connecting screw rod extends towards the fixture body side and passes through the fixture body. A locking nut assembly is provided at the end of the connecting screw rod passing through the fixture body. An adjusting nut assembly is provided on the upper surface of the fixing member. When the orbital detection fixture in this patent is used, although there is no need to drill holes in the rail, it is necessary to fix the fixture on the rail through the connecting screw rod, the pin, the locking nut assembly, and the adjusting nut assembly. The structure is complex, the disassembly and assembly are inconvenient, and the portability is poor. In addition, the fixture of this patent is clamped on the rail bottom. When installing, it is necessary to lift the rail and extend a part of the fixture into the bottom of the rail to clamp the fixture on the rail bottom. This not only makes the disassembly and assembly laborious, but also affects the normal operation of the rail and cannot detect the rail all-weather.

[0006] Therefore, it is necessary to design an acoustic emission sensor fixture for on-line monitoring of rails, which has a lower maintenance cost, has no adverse effect on the rail circuit, does not damage the rail structure, can detect the rail all-weather, has a simple structure, is convenient for disassembly and assembly, and is firmly installed. Utility Model Content

[0007] Aiming at the above problems existing in the prior art, the purpose of the present utility model is to provide an acoustic emission sensor fixture for on-line monitoring of rails.

[0008] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0009] An acoustic emission sensor fixture for on-line monitoring of rails, which includes a fixture body. Linkage mechanisms are respectively provided on both sides of the fixture body. The bottom of the linkage mechanism is connected with a magnetic suction seat. The fixture body has a fixture inner cavity that penetrates up and down. A piston rod is vertically provided in the fixture inner cavity. The lower end of the piston rod is connected with a piston that is adapted to the fixture inner cavity and can move up and down along the inner side wall of the fixture inner cavity. The upper end of the piston rod vertically passes through the top of the fixture body and extends upward. A telescopic spring is sleeved outside the piston rod. The upper end of the telescopic spring is connected with the inner top wall of the fixture body, and the lower end of the telescopic spring is connected with the top surface of the piston. The bottom of the piston is connected with an acoustic emission sensor. The bottom of the fixture body is connected with a connection disk that communicates with the fixture inner cavity. An air extraction pump is provided outside the fixture body. The air extraction pump is communicated with the inner cavity of the connection disk and the chamber below the piston in the fixture inner cavity through a pipeline.

[0010] In an implementation scheme, a limit block is provided above the fixture body and at the upper end of the piston rod.

[0011] An implementation scheme, the linkage mechanism includes a fixed rod and a connecting rod. One end of the fixed rod is fixedly connected to the outer side wall of the fixture body, the other end of the fixed rod is rotatably connected to the upper end of the connecting rod, a connecting plate is fixedly connected to the lower end of the connecting rod, and the magnetic suction seat is connected to the bottom of the connecting plate.

[0012] A preferred scheme, a connecting block is fixedly arranged on the outer side wall of the fixture body, and the end of the fixed rod far away from the connecting rod is fixedly connected to the connecting block.

[0013] An implementation scheme, a sealing ring is arranged between the fixture body and the connecting disc.

[0014] An implementation scheme, a power supply seat is connected to the bottom of the piston, and the acoustic emission sensor is arranged at the bottom of the power supply seat.

[0015] An implementation scheme, an air pump interface communicating with the inner cavity of the connecting disc and the chamber below the piston in the inner cavity of the fixture is arranged at the lower part of the side wall of the fixture body, and an air pipe is connected between the air suction port of the air extraction pump and the air pump interface.

[0016] A preferred scheme, a fixture connecting sleeve is arranged at the position corresponding to the air pump interface on the outer side wall of the fixture body, an air pump connecting sleeve is arranged at the air suction port of the air extraction pump, one end of the air pipe is connected to the fixture connecting sleeve, and the other end of the air pipe is connected to the air pump connecting sleeve.

[0017] An implementation scheme, a warning sign is arranged on the outer side wall of the fixture body.

[0018] An implementation scheme, air pump mounting blocks are respectively fixedly connected to the four corners of the air extraction pump, and mounting holes are arranged on the air pump mounting blocks.

[0019] An implementation scheme, a parameter identification plate is arranged on the side surface of the air extraction pump.

[0020] An implementation scheme, an adapter is arranged on the side surface of the air extraction pump, and a power supply wire is fixedly connected to the inner wall of the adapter.

[0021] An implementation scheme, a potential seat is fixedly connected to the upper surface of the air extraction pump, and a group of status display lights are fixedly connected to the upper surface of the potential seat.

[0022] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0023] The acoustic emission sensor fixture for on-line monitoring of steel rails provided by the present utility model can install and fix the acoustic emission sensor on the side surface of the web of the steel rail, and has the advantages of low maintenance cost, no adverse effect on the steel rail circuit, no damage to the steel rail structure, capable of detecting the steel rail all-weather, simple structure, convenient disassembly and assembly, and firm installation, and has remarkable practical value. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the acoustic emission sensor fixture for on-line monitoring of rail provided in the embodiment of the present utility model;

[0025] Figure 2 It is a sectional view of the acoustic emission sensor fixture for on-line monitoring of rail provided in the embodiment of the present utility model;

[0026] Figure 3 It is a schematic diagram of the air pump in the embodiment of the present utility model;

[0027] Figure 4 It is a schematic diagram of the air pump from another angle in the embodiment of the present utility model;

[0028] Figure 5 It is a working state diagram of the acoustic emission sensor fixture in the embodiment of the present utility model;

[0029] The reference numerals in the figure are indicated as follows:

[0030] 1. Fixture body; 101. Air pump interface; 2. Link mechanism; 201. Fixed rod; 202. Connecting rod; 203. Pin shaft; 3. Magnetic suction seat; 4. Piston rod; 5. Piston; 6. Telescopic spring; 7. Acoustic emission sensor; 8. Connection plate; 9. Air pump; 10. Rail; 11. Limit block; 12. Connection plate; 13. Connection block; 14. Sealing ring; 15. Power supply seat; 16. Air pipe; 17. Fixture connecting sleeve; 18. Air pump connecting sleeve; 19. Warning sign; 20. Air pump mounting block; 21. Parameter identification sign; 22. Adapter; 23. Power supply wire; 24. Potential seat; 25. Status display lamp. Detailed Embodiment

[0031] The technical solution of the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. In addition, it should be noted that the terms used in the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. Unless otherwise defined, the technical terms or scientific terms used in the present utility model should be the ordinary meanings understood by those with ordinary skills in the art. The orientation or positional relationship indicated by terms such as "inside", "outside", "upper", "lower", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "clockwise", "counterclockwise", etc. are all based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, terms such as "set", "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be directly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Terms such as "first", "second", etc. are only for descriptive purposes and can be one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined. It should also be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there can also be an intermediate element.

[0032] Embodiment

[0033] Combined with Figures 1 to 5 As shown in the figure: A kind of acoustic emission sensor fixture for on-line monitoring of steel rails provided by the present utility model includes a fixture body 1. Linkage mechanisms 2 are respectively arranged on both sides of the fixture body 1. A magnetic suction seat 3 is connected to the bottom of the linkage mechanism 2. The fixture body 1 has a fixture inner cavity that penetrates up and down (the mark is omitted, Figure 2 the chamber where the piston rod, telescopic spring, piston, and acoustic emission sensor are located as a whole in the figure is the fixture inner cavity). A piston rod 4 is vertically arranged in the fixture inner cavity. The lower end of the piston rod 4 is connected with a piston 5 that is adapted to the fixture inner cavity and can move up and down along the inner side wall of the fixture inner cavity. The upper end of the piston rod 4 vertically passes through the top of the fixture body 1 and extends upward. A telescopic spring 6 is sleeved outside the piston rod 4. The upper end of the telescopic spring 6 is connected to the inner top wall of the fixture body 1, and the lower end of the telescopic spring 6 is connected to the top surface of the piston 4. The bottom of the piston 5 is connected with an acoustic emission sensor 7. The bottom of the fixture body 1 is connected with a connection disk 8 that is communicated with the fixture inner cavity. An air extraction pump 9 is arranged outside the fixture body 1. The air extraction pump 9 is communicated with the inner cavity of the connection disk 8 and the chamber below the piston 4 in the fixture inner cavity through a pipeline.

[0034] The usage method of the acoustic emission sensor fixture for on-line monitoring of steel rails of the present utility model is as follows:

[0035] See Figure 5 As shown, first place the fixture with the acoustic emission sensor 7 installed inside on one side of the steel rail 10 to be detected. Then adjust the angle of the link mechanism 2 so that both the magnetic suction seat 3 at the bottom of the link mechanism 2 and the connection disk 8 at the bottom of the fixture body 1 are facing the waist side of the steel rail 10. Then adsorb the magnetic suction seat 3 on the waist side of the steel rail 10 and make the connection disk 8 contact the waist side of the steel rail 10. Then turn on the air pump 9 and pump air to the connection disk 8 through the air pump 9 to form a negative pressure in the inner cavity of the connection disk 8, so that the connection disk 8 is firmly adsorbed on the waist side of the steel rail 10. At the same time, the air pump 9 pumps air to the chamber below the piston 4 in the inner cavity of the fixture to form a negative pressure in the chamber below the piston 4. Under the action of the negative pressure, the piston 4 moves towards the waist side of the steel rail 10, and then drives the acoustic emission sensor 7 to move towards the waist side of the steel rail 10 until the acoustic emission sensor 7 is closely attached to the waist side of the steel rail 10. The air pump 9 stops pumping air. In this way, the acoustic emission sensor 7 can be installed and fixed on the waist side of the steel rail 10. Then use the acoustic emission sensor 7 to detect the defects of the steel rail 10. After the defect detection is completed, inflate the chamber below the piston 4 in the inner cavity of the fixture through the air pump 9. The piston 4 returns to its original position under the action of the gas, so that the acoustic emission sensor 7 is separated from the steel rail 10. At the same time, the inner cavity of the connection disk 8 returns to the normal pressure state. In this way, the connection disk 8 is no longer tightly adsorbed on the waist side of the steel rail 10. Then move the magnetic suction seat 3 away from the waist side of the steel rail 10, so as to remove the whole fixture from the waist side of the steel rail 10;

[0036] As can be seen from the above, the fixture of the present utility model can not only adsorb the fixture on the waist side of the steel rail 10 by the magnetic adsorption of the magnetic suction seat 3, but also adsorb the fixture on the waist side of the steel rail 10 by the negative pressure in the fixture body 1 and the connection disk 8. In this way, the fixture is installed and fixed on the waist side of the steel rail 10 through the double adsorption of magnetic adsorption and negative pressure adsorption. The installation is firm, which can effectively prevent the fixture from displacing or shaking on the steel rail 10, ensure that the fixture always maintains a stable position during the detection process, thereby improving the accuracy and reliability of the detection results. And the magnetic adsorption and negative pressure adsorption have no adverse effects on the steel rail circuit, the maintenance cost is low, there is no need to drill holes in the steel rail 10, and the steel rail structure will not be damaged;

[0037] In addition, during the detection process, the fixture controls the movement of the piston 4 through the pumping and inflation of the air pump 9, and then controls the fitting and separation of the acoustic emission sensor 7 and the steel rail 10. The disassembly and assembly are convenient, and the overall structure of the fixture is simple, small and portable;

[0038] In addition, the fixture of the present utility model is installed on the side of the web of the rail 10, which does not affect the normal operation of the rail 10 and can detect the rail all-weather.

[0039] In this embodiment, as Figure 1 and Figure 2 shown, a limit block 11 is provided above the fixture body 1 and at the upper end of the piston rod 5 to limit the piston rod 5 and prevent the piston rod 5 from moving excessively.

[0040] In this embodiment, the linkage mechanism 2 includes a fixed rod 201 and a connecting rod 202. One end of the fixed rod 201 is fixedly connected to the outer side wall of the fixture body 1, the other end of the fixed rod 201 is rotatably connected to the upper end of the connecting rod 202, a connecting plate 12 is fixedly connected to the lower end of the connecting rod 202, and the magnetic suction seat 3 is connected to the bottom of the connecting plate 12. Specifically, the fixed rod 201 and the connecting rod 202 are rotatably connected by a pin shaft 203. The overall angle of the fixture can be adjusted through the linkage mechanism 2, enhancing the flexibility, practicability and versatility of the overall use of the fixture.

[0041] In addition, a connecting block 13 is fixedly provided on the outer side wall of the fixture body 1, and the end of the fixed rod 201 away from the connecting rod 202 is fixedly connected to the connecting block 13. The connecting block 13 and the fixture body 1 can be fixedly connected by welding, and the fixed rod 201 and the connecting block 13 can also be fixedly connected by welding.

[0042] In this embodiment, a sealing ring 14 is provided between the fixture body 1 and the connecting disc 8, strengthening the sealing between the fixture body 1 and the connecting disc 8 and improving the overall sealing of the fixture.

[0043] In this embodiment, a power supply base 15 is connected to the bottom of the piston 5, and the acoustic emission sensor 7 is provided at the bottom of the power supply base 15. The power supply base 15 is used to install and fix the acoustic emission sensor 7 and supply power to the acoustic emission sensor 7 at the same time. When in use, the power supply base 15 is externally connected to a power source.

[0044] In this embodiment, an air pump interface 101 communicating with the inner cavity of the connecting disc 8 and the chamber below the piston 5 in the fixture inner cavity is provided at the lower part of the side wall of the fixture body 1, and an air pipe 16 is connected between the air extraction port of the air extraction pump 9 and the air pump interface 101. The air pipe 16 can be a commercially available product, for example, it can be a commercially available high-pressure pipe. In this way, the air extraction pump 9 communicates with the inner cavity of the connecting disc 8 and the chamber below the piston 5 in the fixture inner cavity through the air pipe 16, and can perform air extraction and inflation operations on the inner cavity of the connecting disc 8 and the chamber below the piston 5 in the fixture inner cavity. The air extraction pump 9 itself has two functions of air extraction and inflation. This part belongs to the prior art and will not be elaborated here one by one.

[0045] In addition, a fixture connecting sleeve 17 is provided on the outer side wall of the fixture body 1 corresponding to the position of the air pump interface 101. An air pump connecting sleeve 18 is provided at the air extraction port of the air extraction pump 9. One end of the air pipe 16 is connected to the fixture connecting sleeve 17, and the other end of the air pipe 16 is connected to the air pump connecting sleeve 18.

[0046] In this embodiment, as shown in Figure 1 shown, a warning sign 19 is provided on the outer side wall of the fixture body 1, which is used to warn irrelevant personnel.

[0047] In this embodiment, air pump mounting blocks 20 are respectively and fixedly connected to the four corners of the air extraction pump 9. Mounting holes (omitted from marking) are provided on the air pump mounting blocks 20 for mounting and fixing the air extraction pump 9. When in use, the air extraction pump 9 is installed near the track 10 according to the actual situation. For example, it can be directly installed and fixed to the ground on the side of the track 10 through the cooperation of the air pump mounting blocks 20 and fasteners, or a device box can be provided near the track 10, and the air extraction pump 9 can be installed in the device box.

[0048] In this embodiment, as shown in Figure 4 shown, a parameter identification plate 21 is provided on the side of the air extraction pump 9. The relevant performance parameters of the fixture are written on the parameter identification plate 21, which can improve the recognition rate of the fixture and is conducive to the popularization of the fixture.

[0049] In this embodiment, a connector 22 is provided on the side of the air extraction pump 9. A power supply wire 23 is fixedly connected to the inner wall of the connector 22. A plug or interface (omitted in the figure) for connecting to a power supply is provided at the end of the power supply wire 23. When in use, the fixture is connected to the power supply through the power supply wire 23 to supply power to the whole fixture (including the power supply base 15).

[0050] In this embodiment, a potential seat 24 is fixedly connected to the upper surface of the air extraction pump 9. A group of status display lights 25 are fixedly connected to the upper surface of the potential seat 24, which are used to display the operating status of the fixture, so that the staff can intuitively understand the operating status of the fixture.

[0051] Finally, it is necessary to point out here: The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An acoustic emission sensor fixture for on-line monitoring of steel rails, characterized in that: It includes a fixture body, with link mechanisms respectively arranged on both sides of the fixture body. A magnetic suction base is connected to the bottom of the link mechanism. The fixture body has a vertically penetrating fixture inner cavity. A piston rod is vertically arranged in the fixture inner cavity. The lower end of the piston rod is connected with a piston that is adapted to the fixture inner cavity and can move up and down along the inner side wall of the fixture inner cavity. The upper end of the piston rod vertically penetrates the top of the fixture body and extends upward. A telescopic spring is sleeved outside the piston rod. The upper end of the telescopic spring is connected to the inner top wall of the fixture body, and the lower end of the telescopic spring is connected to the top surface of the piston. A acoustic emission sensor is connected to the bottom of the piston. A connection disk that communicates with the fixture inner cavity is connected to the bottom of the fixture body. An air extraction pump is arranged outside the fixture body. The air extraction pump is communicated with the inner cavity of the connection disk and the chamber in the fixture inner cavity below the piston through a pipeline.

2. The acoustic emission sensor fixture for on-line monitoring of steel rails according to claim 1, characterized in that: A limit block is arranged above the fixture body and at the upper end of the piston rod.

3. The acoustic emission sensor fixture for on-line monitoring of rail according to claim 1, characterized in that: The link mechanism includes a fixed rod and a connecting rod. One end of the fixed rod is fixedly connected to the outer side wall of the fixture body, and the other end of the fixed rod is rotatably connected to the upper end of the connecting rod. The lower end of the connecting rod is fixedly connected with a connecting plate, and the magnetic suction base is connected to the bottom of the connecting plate.

4. The acoustic emission sensor fixture for on-line monitoring of rail according to claim 3, characterized in that: A connecting block is fixedly arranged on the outer side wall of the fixture body, and the end of the fixed rod away from the connecting rod is fixedly connected to the connecting block.

5. The acoustic emission sensor fixture for on-line monitoring of steel rails according to claim 1, characterized in that: A sealing ring is arranged between the fixture body and the connection disk.

6. The acoustic emission sensor fixture for on-line monitoring of steel rails according to claim 1, wherein: An air pump interface that communicates with the inner cavity of the connection disk and the chamber in the fixture inner cavity below the piston is arranged at the lower part of the side wall of the fixture body. A trachea is connected between the air extraction port of the air extraction pump and the air pump interface.

7. The acoustic emission sensor fixture for on-line monitoring of steel rails according to claim 1, characterized in that: A warning sign is arranged on the outer side wall of the fixture body.

8. The acoustic emission sensor fixture for on-line monitoring of steel rails according to claim 1, characterized in that: A potential seat is fixedly connected to the upper surface of the air extraction pump, and a group of status display lights are fixedly connected to the upper surface of the potential seat.

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