A fiber grating intelligent monitoring device for coal mine drill rod speed

Abstract

The present invention discloses an intelligent fiber grating (FBG) monitoring device for coal mine drill pipe speed, comprising a drill pipe and a drill rig; one end of the drill pipe is connected to an adapter on the drill rig; a fiber grating (FBG) speed sensor is provided at the connection between the adapter and the drill pipe; the FBG speed sensor is fixedly mounted on the adapter, and a contact head installed in the FBG speed sensor abuts the drill pipe. The present invention designs and utilizes a fiber grating (FBG) speed sensor, which transmits optical signals rapidly, enabling timely and efficient transmission of the drill pipe speed signal to a computer data processing system and generation of a graph, enabling real-time monitoring of the drill pipe speed. FBG monitoring also boasts high precision, making it more effective than other types of sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring equipment, in particular to a fiber grating intelligent monitoring device for coal mine drill rod rotation speed. Background Art

[0002] As a crucial component of drilling equipment, the drill rod plays a vital role in transmitting power and circulating fluid during coal mining, ensuring the proper operation of the drilling process. During the drilling process, stress exerted by the coal rock mass compresses the drill bit and drill rod. As the stress on the coal rock mass increases, the compressive force on the drill bit and drill rod intensifies. Friction between the drill bit, drill rod, and the coal rock mass increases, reducing the drill rod rotational speed. Furthermore, the drilling rate varies as the drill rod passes through rock formations of varying hardness. Therefore, drill rod rotational speed is a crucial indicator for determining stress states and lithologic parameters, and accurately capturing the rotational speed signal is crucial in drilling operations. Existing rotational speed monitoring methods primarily include traditional optical, photoelectric, and magnetoelectric methods. Traditional optical sensors have complex structures and strict environmental requirements, making them inoperable in equipment exposed to dust and oil. Photoelectric and magnetoelectric monitoring methods, subject to electrical conduction constraints, have poor immunity to electromagnetic interference, hinder long-distance data transmission and remote control, and are therefore not suitable for use in flammable and explosive environments.

[0003] Therefore, it is urgent to design an intelligent monitoring device for coal mine drill rod speed based on fiber grating. Summary of the Invention

[0004] The purpose of the present invention is to provide a coal mine drill rod speed fiber grating intelligent monitoring device to solve the problems existing in the above-mentioned prior art, and to achieve accurate measurement of the drill rod speed by monitoring the wavelength change process.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a coal mine drill rod speed fiber Bragg grating intelligent monitoring device, comprising a drill rod and a drilling rig; one end of the drill rod is transmission-connected to an adapter on the drilling rig; a fiber Bragg grating speed sensor is provided at the connection between the adapter and the drill rod; the fiber Bragg grating speed sensor is fixedly mounted on the adapter, and a contact head installed in the fiber Bragg grating speed sensor abuts against the drill rod.

[0006] The fiber Bragg grating speed sensor comprises a sensor housing; one side of the sensor housing is fixedly mounted on the adapter; the outer wall of the sensor housing is provided with a plurality of mounting cavities extending through the inner cavity; and a sensing part is mounted in the mounting cavity.

[0007] There are two installation cavities, which are symmetrically arranged with respect to the drill rod.

[0008] The sensing part includes a base frame; the base frame is fixedly mounted on the outer wall of the sensor housing; a mounting groove is provided on the side of the base frame facing the inner cavity of the sensor housing; a base plate and two telescopic inner rods are respectively mounted in the mounting grooves; the two telescopic inner rods are symmetrically arranged with respect to the base plate; a telescopic outer rod is slidably mounted outside the telescopic inner rod; the two telescopic outer rods are also fixedly connected to both ends of the contact head.

[0009] The base sheet is pasted with a fiber Bragg grating strain sensor and a fiber Bragg grating temperature sensor.

[0010] A groove is provided in the middle of one side of the base sheet away from the base frame; one end of an elastic member is fixedly installed in the groove; and the other end of the elastic member is fixedly connected to the middle of the end surface of the contact head.

[0011] The cross section of the contact head is a U-shaped structure.

[0012] The drill rod is a hexagonal drill rod; a drill bit is also installed at the other end of the drill rod.

[0013] The present invention discloses the following technical effects:

[0014] 1. Real-time monitoring with high precision: The present invention designs and uses a fiber Bragg grating (FBG) speed sensor. The fiber Bragg grating (FBG) optical signal transmission is rapid, and the drill pipe speed signal can be transmitted to the computer data processing system in a timely and effective manner to generate a curve graph, thereby monitoring the drill pipe speed in real time. The fiber Bragg grating (FBG) monitoring has high precision and is more effective than other types of sensors.

[0015] 2. Strong ability to resist external interference; the underground environment of coal mines is harsh. Fiber Bragg gratings use optical signals as the transmission medium and are completely unaffected by external factors such as mine water, gas, and electromagnetic interference. They also have a long service life and can be used on drilling rigs for a long time.

[0016] 3. The production cost of fiber grating intelligent monitoring device is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the overall structure;

[0019] Figure 2 Schematic diagram of the structure of fiber Bragg grating speed sensor;

[0020] Figure 3is a graph showing the change of fiber Bragg grating wavelength over time;

[0021] Among them, 1. drill rod; 2. fiber Bragg grating speed sensor; 3. adapter; 4. drilling rig; 5. drill bit; 6. sensor housing; 7. mounting cavity; 8. base frame; 9. substrate; 10. fiber Bragg grating strain sensor; 11. fiber Bragg grating temperature sensor; 12. elastic part; 13. contact head; 14. telescopic outer rod; 15. telescopic inner rod. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention provides a fiber Bragg grating intelligent monitoring device for coal mine drill rod speed, comprising a drill rod 1 and a drilling rig 4; one end of the drill rod 1 is transmission-connected to an adapter 3 on the drilling rig 4; a fiber Bragg grating speed sensor 2 is provided at the connection between the adapter 3 and the drill rod 1; the fiber Bragg grating speed sensor 2 is fixedly mounted on the adapter 3, and a contact head 13 installed in the fiber Bragg grating speed sensor 2 abuts against the drill rod 1.

[0025] Furthermore, as an emerging sensing element, fiber Bragg grating (FBG) has the function of data transmission. It has the characteristics of wavelength demodulation, passive and non-electrical, strong anti-electromagnetic interference ability, oil resistance, corrosion resistance, and the ability to transmit data over long distances. Therefore, monitoring the drill pipe speed with the help of fiber Bragg grating sensing technology can largely overcome the shortcomings of other monitoring methods.

[0026] The fiber Bragg grating speed sensor 2 includes a sensor housing 6 ; one side of the sensor housing 6 is fixedly mounted on the adapter 3 ; a plurality of mounting cavities 7 are provided on the outer wall of the sensor housing 6 and extend through the inner cavity; a sensing part is mounted in the mounting cavity 7 .

[0027] There are two mounting cavities 7 , which are symmetrically arranged with respect to the drill rod 1 .

[0028] The sensing part includes a base frame 8; the base frame 8 is fixedly mounted on the outer wall of the sensor housing 6; a mounting groove is provided on the side of the base frame 8 facing the inner cavity of the sensor housing 6; a base plate 9 and two telescopic inner rods 15 are respectively mounted in the mounting grooves; the two telescopic inner rods 15 are symmetrically arranged about the base plate 9; a telescopic outer rod 14 is slidably mounted outside the telescopic inner rod 15; the two telescopic outer rods 14 are also fixedly connected to both ends of the contact head 13.

[0029] A fiber Bragg grating strain sensor 10 and a fiber Bragg grating temperature sensor 11 are attached to the base plate 9 .

[0030] In one embodiment of the present invention, in order to eliminate the influence of temperature during the drill pipe rotation speed monitoring process, a fiber Bragg grating temperature sensor 11 is used for temperature compensation.

[0031] A groove is formed in the middle of one side of the base plate 9 away from the bottom frame 8 ; one end of the elastic member 12 is fixedly installed in the groove; the other end of the elastic member 12 is fixedly connected to the middle of the end surface of the contact head 13 .

[0032] The cross section of the contact head 13 is a U-shaped structure.

[0033] In one embodiment of the present invention, the middle portion of the end surface of the contact head 13 is fixedly connected to one end of the elastic member 12 , and both ends of the contact head 13 are fixedly connected to the two telescopic outer rods 14 .

[0034] In one embodiment of the present invention, the elastic member 12 is a spring.

[0035] The drill rod 1 is a hexagonal drill rod; a drill bit 5 is also installed at the other end of the drill rod 1.

[0036] In one embodiment of the present invention, the rotation of the hexagonal drill rod 1 causes the contact head 13 to produce an oscillatory deformation of compression and extension, thereby causing the elastic member 12 to produce synchronous deformation. The elastic member 12 compresses or stretches the substrate 9, and ultimately causes the fiber Bragg grating strain sensor 10 to produce synchronous strain changes. With the help of a fiber Bragg grating demodulator, the signal is analyzed and transmitted to a computer data processing system to obtain a curve graph of the fiber Bragg grating wavelength change over time.

[0037] Furthermore, different drill pipe rotation speeds cause the sensor to have different oscillation periods, which manifests as different time periods of fiber Bragg grating wavelength changes. The rotation speed and the wavelength change period have a corresponding relationship. Therefore, accurate measurement of the drill pipe rotation speed can be achieved by monitoring the wavelength change period.

[0038] like Figure 3As shown, from 0 to t1, the period of the fiber Bragg grating wavelength change is T1, and the rotation speed of drill pipe 1 is n1; from t1 to t2, the period of the fiber Bragg grating wavelength change is T2, and the rotation speed of drill pipe 1 is n2; from t2 to t3, the period of the fiber Bragg grating wavelength change is T3, and the rotation speed of drill pipe 1 is n3. Since the rotation speed is smaller when the wavelength change period is larger, that is, when T1 > T2 > T3, n1 < n2 < n3. Therefore, the accurate measurement of the rotation speed of the drill pipe can be achieved by monitoring the wavelength change period.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A fiber Bragg grating intelligent monitoring device for coal mine drill pipe speed, characterized in that: include: A drill rod (1) and a drilling rig (4); one end of the drill rod (1) is in transmission connection with an adapter (3) on the drilling rig (4); a fiber Bragg grating speed sensor (2) is provided at the connection between the adapter (3) and the drill rod (1); the fiber Bragg grating speed sensor (2) is fixedly mounted on the adapter (3), and a contact head (13) mounted in the fiber Bragg grating speed sensor (2) abuts against the drill rod (1); The fiber Bragg grating speed sensor (2) comprises a sensor housing (6); one side of the sensor housing (6) is fixedly mounted on the adapter (3); a plurality of mounting cavities (7) extending through the outer wall of the sensor housing (6) toward the inner cavity are formed; a sensing portion is mounted in the mounting cavity (7); The sensing part includes a base frame (8); the base frame (8) is fixedly mounted on the outer wall of the sensor housing (6); a mounting groove is provided on the side of the base frame (8) facing the inner cavity of the sensor housing (6); a base plate (9) and two telescopic inner rods (15) are respectively mounted in the mounting groove; the two telescopic inner rods (15) are symmetrically arranged with respect to the base plate (9); a telescopic outer rod (14) is slidably mounted outside the telescopic inner rod (15); and the two telescopic outer rods (14) are also fixedly connected to both ends of the contact head (13).

2. The fiber Bragg grating intelligent monitoring device for coal mine drill pipe speed according to claim 1, characterized in that: There are two mounting cavities (7), which are symmetrically arranged with respect to the drill rod (1).

3. The fiber Bragg grating intelligent monitoring device for coal mine drill pipe rotation speed according to claim 1, characterized in that: A fiber Bragg grating strain sensor (10) and a fiber Bragg grating temperature sensor (11) are adhered to the substrate sheet (9).

4. The fiber Bragg grating intelligent monitoring device for coal mine drill pipe rotation speed according to claim 1, characterized in that: A groove is provided in the middle of one side of the base plate (9) away from the base frame (8); one end of an elastic member (12) is fixedly installed in the groove; the other end of the elastic member (12) is fixedly connected to the middle of the end face of the contact head (13).

5. The fiber Bragg grating intelligent monitoring device for coal mine drill pipe rotation speed according to claim 1, characterized in that: The cross section of the contact head (13) is a U-shaped structure.

6. The fiber Bragg grating intelligent monitoring device for coal mine drill pipe rotation speed according to claim 1, characterized in that: The drill rod (1) is a hexagonal drill rod; a drill bit (5) is also installed at the other end of the drill rod (1).

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