A turnout close clearance detection device and detection method

Abstract

The present disclosure belongs to the technical field of turnout close clearance detection, and provides a turnout close clearance detection device and a detection method, which are used for detecting the close clearance between a turnout basic rail and a turnout point rail. The method comprises: a core combination, which comprises two cores and a bottom plate, the two cores are installed on the turnout basic rail, one end of each core faces the turnout basic rail, the other end of each core faces the turnout point rail, and a clearance exists between each core and the turnout point rail; the bottom plate is fixedly installed on the web of the turnout basic rail, the core and the bottom plate are integrally formed, the bottom plate is arranged on the side of the core close to the turnout basic rail, two induction coils are sleeved on the two cores respectively, two excitation coils are sleeved on the two induction coils respectively and coaxial with the two induction coils, the two excitation coils are used for exciting the two induction coils to generate induced electromotive force, and a calculation module is connected to the output ends of the two induction coils. The calculation module calculates the value of the close clearance according to the value of the induced electromotive force generated in the two induction coils. The problem that the mechanical detection device is usually prone to wear and causes inaccurate close clearance measurement can be solved.

Description

Technical Field

[0001] This disclosure belongs to the field of turnout tightness detection technology, and particularly relates to a turnout tightness detection device and detection method. Background Technology

[0002] The turnout tightness detection device is used to monitor the tightness between the turnout switch rail and the stock rail in real time. The switch rail can slide on the slide plate under the traction of the turnout switching equipment. When one switch rail slides to be in close contact with and locked to the stock rail on the same side, a tightness force will be generated between the switch rail and the stock rail. At the same time, there will also be a tightness gap between the two. Whether the switch rail and the stock rail are in close contact is directly related to the safe operation of the train.

[0003] The current railway turnout switch rail and stock rail contact detection device is mainly a contact checker. Its principle and internal function are similar to the electrical contact mechanism in the switch machine. It is a mechanical detection device, which is usually susceptible to wear, resulting in inaccurate measurement of the contact gap. Summary of the Invention

[0004] To address the aforementioned issues, this disclosure provides a turnout tightness detection device and method, which uses the magnetic flux method to monitor the turnout tightness, thus solving the problem that mechanical detection devices are often susceptible to wear, leading to inaccurate tightness measurements.

[0005] The turnout tightness detection device of the present invention:

[0006] This invention is achieved through the following technical solution:

[0007] A turnout tightness detection device is used to detect the tightness between the turnout main rail and the turnout switch rail; characterized in that it comprises:

[0008] The iron core assembly includes two iron cores and a base plate. The two iron cores are installed on the main rail of the turnout, with one end of each iron core facing the main rail and the other end facing the switch rail, and there is a gap between them. The base plate is fixedly installed on the web of the main rail of the turnout, and the iron cores and the base plate are integrally formed. The base plate is located on the side of the iron cores closest to the main rail of the turnout.

[0009] Two induction coils are respectively mounted on the two iron cores;

[0010] Two excitation coils are respectively mounted on the two induction coils and are coaxial with the two induction coils; they are used to excite the two induction coils to generate induced electromotive force.

[0011] The calculation module has its input terminal connected to the output terminals of two induction coils; the calculation module calculates the value of the close-fitting gap based on the value of the induced electromotive force generated in the two induction coils.

[0012] Furthermore,

[0013] The excitation coil, induction coil, and iron core are encapsulated in a sealed cover made of a non-ferromagnetic material.

[0014] Furthermore,

[0015] The excitation coil generates an excitation magnetic field by receiving excitation current from the circuit controller.

[0016] Furthermore,

[0017] It also includes: a circuit controller, whose input is connected to the output of the induction coil and whose output is connected to the input of the calculation module, used to filter out the interfering magnetic field generated by the rail current.

[0018] Furthermore,

[0019] The core assembly is installed at the first traction point of the turnout tip, and one core assembly is installed at each turnout tip.

[0020] Furthermore,

[0021] A single trackside controller is used for multiple sets of iron cores combined in a single turnout.

[0022] A detection method for a turnout tightness detection device, characterized in that it includes:

[0023] Two excitation coils are energized to form excitation magnetic fields of the same magnitude but opposite directions;

[0024] The excitation magnetic field induces an electromotive force in the two induction coils; the induced electromotive force generated in the two induction coils is collected and input into the calculation module;

[0025] The calculation module calculates the value of the tight-fitting gap based on the value of the induced electromotive force.

[0026] Furthermore,

[0027] The excitation magnetic field, after passing through the iron core, the gap between the iron core and the turnout switch rail, the turnout switch rail, and the gap between the iron core and the turnout switch rail, induces an electromotive force in the two induction coils.

[0028] Furthermore,

[0029] The induced electromotive forces generated in the two induction coils are compared; if the values ​​of the induced electromotive forces are the same, the value of the close-fitting gap is calculated based on the value of the induced electromotive forces.

[0030] Furthermore,

[0031] The calculation of the tightness gap based on the value of the induced electromotive force includes:

[0032] The induced electromotive force of the induction coil is recorded when the switch point rail and the stock rail are in close contact and when the gap is 4mm, as the initial value for measurement.

[0033] The induced electromotive force value is compared with the initial measurement value in real time. Each induced electromotive force value corresponds to a gap value, thus obtaining the tight-fitting gap value.

[0034] Furthermore,

[0035] Also includes:

[0036] The induced electromotive force values ​​are measured and calibrated regularly when the turnout switch rail is in close contact with the main rail and when the gap is 4mm.

[0037] Compared with the prior art, this disclosure has the following advantages:

[0038] This invention monitors the tightness of turnouts based on the magnetic flux method. When an alternating current passes through the excitation coil installed at the web of the main rail, a magnetic circuit is formed between the core assembly, the tightness gap, and the switch rail. As the tightness gap decreases, the rate of change of magnetic flux gradually increases, which is then converted into an induced electromotive force by the induction coil to reflect the tightness. This invention has the characteristics of non-contact operation and solves the problem that mechanical detection devices are usually prone to wear and tear, resulting in inaccurate measurement of the tightness gap.

[0039] Meanwhile, this invention utilizes a combination of two excitation coils, two induction coils, and an iron core. When the two excitation coils are energized, they form excitation magnetic fields of the same magnitude but opposite directions. These magnetic fields pass through the iron core, the gap between the iron core and the turnout switch rail, the turnout switch rail, and the gap between the iron core and the turnout switch rail, and are then received by the two induction coils, generating induced electromotive forces (EMFs). The induced EMFs generated in the two induction coils are compared. If the comparison results are consistent, the data is considered valid; otherwise, the induction coils are considered faulty, and the data is invalid. This avoids the problem of inaccurate data measurement using the magnetic flux method.

[0040] Other features and advantages of this disclosure will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of a turnout tightness detection device is shown.

[0043] Figure 2 A schematic diagram of the longitudinal section of the turnout tightness detection device is shown. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0045] Figure 1 , Figure 2 A schematic diagram of a turnout tightness detection device according to the present invention is shown, comprising:

[0046] The excitation coil 2 and excitation coil 4, two induction coils 3 and induction coil 5, and an iron core assembly 1 are installed on the web of the main rail near the switch rail. The excitation coil and the induction coil are coaxial and mounted on the iron core assembly.

[0047] When an alternating current passes through the excitation coil, a magnetic field is generated on the core assembly, forming a circular magnetic circuit between the core assembly, the close-fitting gap, the switch rail, the close-fitting gap, and the core assembly. The input excitation current remains constant, and the rate of change of magnetic flux increases as the close-fitting gap decreases. This flux is induced into a voltage by the induction coil, and the change in the close-fitting amount is reflected by the change in voltage.

[0048] Specifically, the core assembly consists of a base plate and two cores. The excitation coil and induction coil are respectively mounted on the two cores, with the excitation coil on the outside and the induction coil on the inside. The core assembly and the coils mounted on the cores are encapsulated in a sealed cover made of non-ferromagnetic material. The base plate is fixedly installed on the web of the turnout's main rail, and the cores and base plate are integrally formed.

[0049] Specifically, two excitation coils are connected, and an excitation current is provided by a circuit controller installed beside the rail, forming excitation magnetic fields of the same magnitude but opposite directions on the two iron cores.

[0050] Specifically, the two induction coils operate independently. The data collected by the induction coils is transmitted via cable to a circuit controller located beside the rail for processing. The input terminal of the circuit controller is connected to the output terminal of the induction coil, and its output terminal is connected to the input terminal of the calculation module. This circuit is used to filter out interfering magnetic fields generated by the rail current. When the processed data matches, the data is considered valid and transmitted to the calculation module; otherwise, the induction coil is considered faulty, and the data is invalid.

[0051] The calculation module calculates the value of the close-fitting gap based on the value of the induced electromotive force generated in the two induction coils.

[0052] Specifically, the core assembly can be installed using either rail drilling or clamp installation. The core assembly is installed at the first traction point of the turnout tip, with one core assembly installed at each turnout tip. Multiple core assemblies for one turnout can share one trackside controller.

[0053] The following are specific examples of the present invention:

[0054] By adjusting the core assembly and the basic installation spacing, when the turnout is in a close-fitting state, the surface of the turnout switch rail (or the turnout traction rod fixing screw) should be as close as possible to the surface of the device (the fixing screw should be aligned with the core) to improve measurement accuracy.

[0055] During initial installation, the computer server records the magnetic flux of each set of devices when the turnout switch rail and the main rail are in close contact and when the gap is 4mm, as the initial measurement values. During subsequent maintenance, the induced electromotive force values ​​when the turnout switch rail and the main rail are in close contact and when the gap is 4mm are measured and calibrated periodically.

[0056] The computer server compares the measured value with the initial measurement value, and then calculates and analyzes the current sealing amount. A pre-alarm sealing value (such as 2mm) can be set in the computer server.

[0057] Based on the above-described device, this disclosure also provides a detection method corresponding to the above-described device, which includes: energizing two excitation coils to form excitation magnetic fields of the same magnitude but opposite directions; collecting the induced electromotive force generated in the two induction coils; comparing the induced electromotive forces generated in the two induction coils; if the comparison results are consistent, determining the size of the close-fitting gap based on the magnitude of the induced electromotive force, that is, according to Ohm's law for magnetic circuits, if the close-fitting gap decreases, the magnetic reluctance in the magnetic circuit decreases, and the magnetic flux increases. With the same alternating current, the rate of change of magnetic flux increases. According to Faraday's law of electromagnetic induction, the induced electromotive force increases with the increase of the rate of change of magnetic flux; the larger the induced electromotive force, the smaller the close-fitting gap.

[0058] Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A device for detecting the close clearance between a switch basic rail and a switch point rail, characterized in that, The utility model relates to a rail gap detection device, including: The iron core combination includes two iron cores and a bottom plate, the two iron cores are installed on the switch basic rail, one end of the two iron cores is towards the switch basic rail, the other end is towards the switch point rail, and there is a gap between the switch point rail; The bottom plate is fixedly installed on the rail waist of the switch basic rail, and the iron core is integrally formed with the bottom plate; The bottom plate is arranged on the side of the iron core close to the switch basic rail; Two induction coils are sleeved on the two iron cores respectively; Two excitation coils are sleeved on the two induction coils respectively and are coaxial with the two induction coils; The two induction coils are excited to generate induced electromotive force; A calculation module is connected to the output ends of the two induction coils; The calculation module calculates the value of the close gap according to the value of the induced electromotive force generated in the two induction coils; Further including: a circuit controller connected to the output ends of the induction coils and connected to the input ends of the calculation module, used for filtering out the interference magnetic field generated by the rail current.

2. The device for detecting the adhesion gap of a turnout according to claim 1, wherein The excitation coil, induction coil and iron core combination are packaged in a non-ferromagnetic material sealing cover.

3. The device for detecting the adhesion gap of a turnout according to claim 1, wherein The excitation coil generates excitation magnetic field by providing excitation current from the circuit controller.

4. The device for detecting the adhesion gap of a turnout according to claim 1, wherein The iron core combination is installed at the first traction point of the switch point, and each set of switch point is provided with one set of iron core combination.

5. The device for detecting the adhesion gap of a turnout according to claim 1, wherein A set of switch is provided with a set of trackside controller.

6. A detection method based on the turnout close clearance detection device according to claim 1, characterized by, Including: Two excitation coils are energized to form excitation magnetic fields with the same size and opposite directions; The excitation magnetic fields excite induced electromotive forces in the two induction coils; The induced electromotive forces generated in the two induction coils are collected and input into the calculation module; The value of the close gap is calculated by the calculation module according to the value of the induced electromotive force.

7. The method of claim 6, wherein, The excitation magnetic fields excite induced electromotive forces in the two induction coils after passing through the iron core, the gap between the iron core and the switch point rail, the switch point rail, and the gap between the iron core and the switch point rail.

8. The method of claim 6, wherein, The induced electromotive forces generated in the two induction coils are compared; if the values of the induced electromotive forces are consistent, the value of the close gap is calculated according to the value of the induced electromotive force.

9. The method of claim 6, wherein, The value of the close gap is calculated according to the value of the induced electromotive force; including: The induced electromotive forces of the induction coils when the switch point rail is close to the basic rail and when the gap is 4mm are recorded as the measurement initial value; The value of the induced electromotive force is compared with the measurement initial value in real time, each value of the induced electromotive force corresponds to a gap value, and then the close gap value is obtained.

10. The method of claim 9, wherein, Further including: The induced electromotive force values when the switch point rail is close to the basic rail and when the gap is 4mm are measured and calibrated periodically.

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