Dumbbell pin elongation detection device based on magnetic encoder

Abstract

The utility model provides a dumbbell pin elongation detection device based on a magnetic encoder, which is applied to the technical field of underground detection, and comprises a dumbbell pin main body and a detection assembly, the detection assembly is installed inside the dumbbell pin main body, and the detection assembly comprises the magnetic encoder, a magnet, a gear, a shaft body, a rack, a contact rod and a circuit board; one end of the contact rod is connected with the rack, the other end of the contact rod extends out of the dumbbell pin body and is connected with the dumbbell pin body, the gear is meshed with the rack, the gear is sleeved on the shaft body, the magnet is installed on the shaft body, and the magnetic encoder is used in cooperation with the magnet, senses magnetic field changes, generates corresponding electric signals and transmits the electric signals to the circuit board. Through deep integration of the magnetic encoder and the dumbbell pin structure, tiny deformation can be quantified in real time, and early fault warning is realized, so that limitation of a traditional detection method is broken through, and powerful technical support is provided for improvement of equipment safety and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of downhole detection technology, specifically relating to a dumbbell pin elongation detection device based on a magnetic encoder. Background Technology

[0002] Dumbbell pins are key components in coal mining machinery used to connect and secure various mechanical parts. They are primarily used to connect components such as the intermediate troughs and transition troughs of equipment like scraper conveyors and transfer conveyors, ensuring the stability and continuity of the equipment during operation. Through their high strength and excellent connecting performance, dumbbell pins can withstand various forces and torques during equipment operation, preventing relative displacement and loosening between components, thereby guaranteeing the overall performance and safety of the equipment.

[0003] In complex underground working conditions, dumbbell pins have long faced multiple technical challenges. Currently, dumbbell pins mostly rely on U-shaped clips or axial clamps for fixation. However, under dynamic loads, U-shaped clips are prone to breakage, coal slurry can easily get into the gaps, or the clamps may fail to hold due to insufficient rigidity. Furthermore, the dumbbell pins use a line contact design with equipment components, which, under repeated bending, can easily lead to irregular movement or localized stress concentration, significantly increasing the risk of breakage. Regular inspection of dumbbell pins is necessary.

[0004] However, existing technologies mainly rely on manual inspections, which require clearing loose coal from the coal face before testing. This is not only inefficient but also poses significant safety hazards. Furthermore, the delayed detection of dumbbell pin breakage or detachment often leads to misalignment of components such as the central channel and transition channel, or even system failure, further amplifying safety risks. Although some solutions attempt to introduce sensors for detection, their low reliability and inability to adapt to complex underground conditions make it difficult to accurately capture the gradual micro-deformation of the dumbbell pin caused by impact loads during push-pull and pull-up operations, resulting in unpredictable breakage risks. Utility Model Content

[0005] In view of the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a dumbbell pin elongation detection device based on a magnetic encoder. By deeply integrating the magnetic encoder with the dumbbell pin structure, it can quantify minute deformations in real time and realize early fault warning, thereby breaking through the limitations of traditional detection methods and providing strong technical support for improving equipment safety and production efficiency.

[0006] A dumbbell pin elongation detection device based on a magnetic encoder includes a dumbbell pin body and a detection component. The detection component is installed inside the dumbbell pin body and includes a magnetic encoder, a magnet, a gear, a shaft, a rack, a contact rod, and a circuit board.

[0007] One end of the contact rod is connected to the rack, and the other end extends out of the dumbbell pin body and is connected to the dumbbell pin body. The gear meshes with the rack and is sleeved on the shaft. The magnet is installed on the shaft. The magnetic encoder works with the magnet to sense changes in the magnetic field, generate corresponding electrical signals, and transmit them to the circuit board.

[0008] Preferably, when the dumbbell pin body is deformed by force, it drives the contact rod and rack to move linearly, thereby driving the gear, shaft and magnet to rotate. The magnetic encoder senses the change in magnetic field due to the rotation of the magnet and outputs a corresponding electrical signal. The circuit board calculates and outputs the elongation of the dumbbell pin body based on the electrical signal.

[0009] Preferably, the gear, rack, and shaft are installed inside the cavity, and a magnetic encoder is installed on the cavity at the position corresponding to the magnet. The cavity is installed in the cavity formed by the connection between the protective shell and the base plate.

[0010] Preferably, the detection component further includes a magnetic switch and a battery, which are installed inside a protective housing.

[0011] Preferably, the circuit board is connected to the cavity, and the circuit board is equipped with an integrated control module, a power supply module and a wireless transmission module. The power supply module is used to supply power to the integrated control module and the wireless transmission module. The integrated control module is used to acquire and process the signals of the magnetic encoder, and the wireless transmission module is used to wirelessly transmit the data processed by the integrated control module.

[0012] Preferably, the dumbbell pin body includes a protrusion and an elongated portion, with both ends of the elongated portion connected to the protrusion to form a dumbbell shape. The detection component is installed in one of the two protrusions, and one end of the contact rod of the detection component extends through the elongated portion and the other protrusion of the dumbbell pin body.

[0013] The beneficial effects of this utility model are as follows: This dumbbell pin elongation detection device based on a magnetic encoder, through the structural design of the contact rod, gear, rack, shaft, magnet, and magnetic encoder, enables the deformation of the dumbbell pin to be transmitted to the contact rod, thereby driving the rack to make linear displacement. Then, the meshing action of the gear and rack drives the gear to drive the magnet on the shaft to rotate. The magnetic encoder senses the change of the surrounding magnetic field when the magnet rotates and generates a corresponding electrical signal, converting the linear displacement into rotational motion. Then, the rotation angle signal is converted into an electrical signal. Finally, the minute deformation of the dumbbell pin is calculated by collecting and processing the electrical signal, realizing real-time monitoring of the dumbbell pin deformation, accurately capturing the change in elongation, and effectively avoiding the drawback of traditional measurement methods that are difficult to detect gradual micro-deformation under dynamic loads.

[0014] Secondly, the testing device is equipped with a wireless transmission module, which uses wireless transmission technology to achieve efficient transmission of measurement data, completely eliminating the problems of cumbersome wiring and easily damaged cables associated with traditional wired transmission on construction sites. Simultaneously, it integrates a high-performance battery for power supply, eliminating the need for external power cords, significantly simplifying the on-site deployment process and greatly improving the flexibility and reliability of the equipment.

[0015] This testing device features a compact and rational structural design, significantly reducing production and maintenance costs. Simultaneously, its automatic monitoring and reset functions reduce manual inspections and maintenance operations, improving work efficiency and reducing human resource input, thereby significantly enhancing economic benefits. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a rear view of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the dumbbell pin body of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the protective shell of this utility model;

[0021] Figure 5 This is a front view of the inside of the protective shell of this utility model;

[0022] Figure 6 This is a schematic diagram of the internal structure of the cavity in this utility model.

[0023] The following are marked in the diagram: 1. Dumbbell pin body; 2. Protective shell; 3. Magnetic switch; 4. Magnetic encoder; 5. Magnet; 6. Gear; 7. Shaft; 8. Rack; 9. Contact rod; 10. Cavity; 11. Circuit board; 12. Battery; 13. Base plate; 14. Fixing plate. Detailed Implementation

[0024] Dumbbell pins are key components in coal mining machinery used to connect and fix various mechanical parts. They are mainly used to connect components such as the middle trough and transition trough of equipment such as scraper conveyors and transfer conveyors, ensuring the stability and continuity of the equipment during operation.

[0025] The dumbbell pins of this application are mainly used to connect various parts of a scraper conveyor, such as the central trough, skylight trough, convex trough, and recessed trough. During coal mining operations, as the hydraulic supports move, adjacent troughs of the scraper conveyor will deflect, causing the dumbbell pins to be subjected to significant external forces and deform. It is necessary to detect the minute deformation of the dumbbell pins through a detection device.

[0026] Example 1

[0027] like Figure 1 As shown, a dumbbell pin elongation detection device based on a magnetic encoder includes a dumbbell pin body 1 and a detection component, the detection component being installed inside the dumbbell pin body 1.

[0028] The detection assembly includes a magnetic switch 3, a magnetic encoder 4, a magnet 5, a gear 6, a shaft 7, a rack 8, a contact rod 9, a cavity 10, a circuit board 11, a battery 12, a base plate 13, and a protective shell 2.

[0029] like Figure 2 , Figure 3 As shown, the base plate 13 and the protective shell 2 are connected to form a cavity for mounting the magnetic switch 3, magnetic encoder 4, magnet 5, gear 6, shaft 7, rack 8, contact rod 9, cavity 10, circuit board 11, and battery 12. The protective shell 2 is screwed into the dumbbell pin body 1, protecting the internal components and ensuring safe and stable operation of the device under complex working conditions. The base plate 13 is located near the outer side of the dumbbell pin body 1 to prevent damage to the detection components from external impacts and collisions, thus comprehensively improving the device's impact resistance and service life.

[0030] like Figure 5 As shown, the magnetic switch 3 is installed inside the protective housing 2 at the upper left, and is responsible for controlling the power supply to and from the entire device. The battery 12 is installed inside the protective housing 2 at the lower left, and is used to provide stable and reliable power support, ensuring that the device can operate normally for a long time in harsh environments such as underground mines.

[0031] like Figure 1 , Figure 6 As shown, one end of the contact rod 9 is connected to the rack 8, and the other end extends out of the dumbbell pin body 1 and is connected to the dumbbell pin body 1 through the fixing plate 14. When the dumbbell pin body 1 is subjected to external force and deforms, it can drive the contact rod 9 to produce a corresponding linear displacement. The fixing plate 14 is used to ensure the accuracy and reliability of the deformation of the dumbbell pin body 1 transmitted to the contact rod 9, avoid measurement errors caused by loosening, and improve the overall structural strength.

[0032] Furthermore, such as Figures 4 to 6As shown, gear 6, rack 8, and shaft 7 are installed inside cavity 10. Cavity 10 is installed in the upper middle part of protective shell 2 by screws, providing reliable structural support. Gear 6 meshes with rack 8, rack 8 is slidably connected to cavity 10, gear 6 is sleeved on shaft 7, and shaft 7 is rotatably connected to cavity 10. A magnet 5 is installed at the end of shaft 7 away from cavity 10, and a magnetic encoder 4 is installed on cavity 10 at the position corresponding to magnet 5. When magnet 5 rotates with shaft 7, magnetic encoder 4 can sense changes in the surrounding magnetic field.

[0033] When the deformation of the dumbbell pin body 1 causes the contact rod 9 to produce a linear displacement, it can drive the rack 8 to slide within the cavity 10. Relying on the meshing action of the gear 6 and the rack 8, the linear displacement of the contact rod 9 can be converted into the rotational motion of the gear 6, thereby driving the magnet 5 on the shaft 7 to rotate. The magnetic encoder 4 senses the change in magnetic field when the magnet 5 rotates and generates a corresponding electrical signal and provides feedback. Specifically, the magnetic encoder 4 is used to convert the rotation angle signal of the magnet 5 into a corresponding electrical signal to achieve accurate monitoring and feedback of the dumbbell pin elongation. The circuit board 11 can calculate the deformation of the dumbbell pin body 1 based on the electrical signal to ensure detection accuracy and real-time performance.

[0034] The circuit board 11 is fixed to the right side of the cavity 10. The circuit board 11 is equipped with an integrated control module, a power supply module, and a wireless transmission module for data acquisition, data processing, and wireless data transmission, ensuring real-time and reliable data transmission. The power supply module provides power to the integrated control module and the wireless transmission module. The integrated control module acquires and processes signals from the magnetic encoder 4, and the wireless transmission module wirelessly transmits the processed data. The integrated control module includes an STM32 microprocessor, and the wireless transmission module includes a LoRa wireless communication module. The circuit board 11 is also compatible with NB-IoT modules. Correspondingly, an antenna is built into the base plate 13 for stable signal transmission.

[0035] It should be noted that the function of circuit board 11 is to acquire, process and transmit the electrical signals generated by magnetic encoder 4, but the process of signal acquisition, signal processing and signal transmission is not the focus of this application and will not be described in detail here.

[0036] Example 2

[0037] like Figure 1 As shown, the structure of this embodiment is basically the same as that of Embodiment 1. The difference is that the dumbbell pin body 1 in this embodiment includes a protrusion and an elongated part. The two ends of the elongated part are respectively connected to the protrusion to form a dumbbell shape. The protrusions at both ends of the dumbbell pin body 1 are used to engage with the ends of the scraper conveyor chute, so that the elongated part can connect two adjacent sections of the scraper conveyor chute, thereby sensing the changes in the chute.

[0038] One of the protrusions at both ends of the dumbbell pin body 1 is provided with a receiving groove for installing the detection component. One end of the contact rod 9 of the detection component extends through the slender part of the dumbbell pin body 1 and the other protrusion. Correspondingly, the slender part of the dumbbell pin body 1 is provided with a small hole to facilitate the passage of the contact rod 9.

[0039] To ensure long-term stable operation, the outer shell of the testing device is made of high-quality, high-strength stainless steel, which is wear-resistant and corrosion-resistant, enabling it to be used for a long time in the harsh environment of underground coal mines, significantly enhancing the durability and adaptability of the equipment.

[0040] Working Principle: This dumbbell pin elongation detection device based on a magnetic encoder works as follows: When the dumbbell pin body 1 deforms and elongates under external force, the contact rod 9, connected to the fixed plate 14 at one end, restricts the displacement of the fixed plate 14 by the dumbbell pin body 1. This causes the contact rod 9 to drive the rack 8 to produce linear displacement. The meshing of the gear 6 and rack 8 drives the gear 6 to rotate, simultaneously causing the magnet 5 on the shaft 7 to rotate synchronously. At this time, the magnetic encoder 4 senses the change in magnetic field, generates an electrical signal, and provides feedback, allowing the circuit board 11 to calculate the deformation of the dumbbell pin body 1. Furthermore, when the external force on the dumbbell pin body 1 is removed, the contact rod 9 retracts, causing the rack 8 to reset, restoring the gear 6 and magnet 5 to their initial positions, achieving automatic reset and zeroing of the detection system.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dumbbell pin elongation detection device based on a magnetic encoder, characterized in that, It includes a dumbbell pin body (1) and a detection component. The detection component is installed inside the dumbbell pin body (1). The detection component includes a magnetic encoder (4), a magnet (5), a gear (6), a shaft (7), a rack (8), a contact rod (9), and a circuit board (11). One end of the contact rod (9) is connected to the rack (8), and the other end extends out of the dumbbell pin body (1) and is connected to the dumbbell pin body (1). The gear (6) meshes with the rack (8), the gear (6) is sleeved on the shaft (7), the magnet (5) is installed on the shaft (7), and the magnetic encoder (4) works in conjunction with the magnet (5) to sense changes in the magnetic field and generate corresponding electrical signals and transmit them to the circuit board (11).

2. The dumbbell pin elongation detection device based on a magnetic encoder according to claim 1, characterized in that, When the dumbbell pin body (1) is deformed by force, it drives the contact rod (9) and rack (8) to move linearly, thereby driving the gear (6), shaft (7) and magnet (5) to rotate. The magnetic encoder (4) senses the change in magnetic field due to the rotation of the magnet (5) and outputs the corresponding electrical signal. The circuit board (11) calculates and outputs the elongation of the dumbbell pin body (1) according to the electrical signal.

3. The dumbbell pin elongation detection device based on a magnetic encoder according to claim 1, characterized in that, The gear (6), rack (8), and shaft (7) are installed inside the cavity (10). A magnetic encoder (4) is installed on the cavity (10) at the position corresponding to the magnet (5). The cavity (10) is installed in the cavity formed by the connection between the protective shell (2) and the base plate (13).

4. The dumbbell pin elongation detection device based on a magnetic encoder according to claim 1, characterized in that, The detection component also includes a magnetic switch (3) and a battery (12), which are installed inside the protective shell (2).

5. The dumbbell pin elongation detection device based on a magnetic encoder according to claim 1, characterized in that, The circuit board (11) is connected to the cavity (10). The circuit board (11) is equipped with an integrated control module, a power supply module and a wireless transmission module. The power supply module is used to supply power to the integrated control module and the wireless transmission module. The integrated control module is used to collect and process the signal of the magnetic encoder (4). The wireless transmission module is used to wirelessly transmit the data processed by the integrated control module.

6. The dumbbell pin elongation detection device based on a magnetic encoder according to claim 1, characterized in that, The dumbbell pin body (1) includes a protrusion and an elongated portion. The two ends of the elongated portion are respectively connected to the protrusion to form a dumbbell shape. The detection component is installed in one of the two protrusions. One end of the contact rod (9) of the detection component extends through the elongated portion and the other protrusion of the dumbbell pin body (1).

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