A speed sensor detection device for a mining belt conveyor

Abstract

The utility model provides a kind of mine belt conveyor speed sensor detection device.Technical field is related to sensor detection technology.The technical problem that is solved is that existing detection device cannot simulate complex working condition, detection precision is low, measured object needs to be reformed and security is insufficient.The technical scheme is: including transmission mechanism, speed simulation mechanism and fixed mechanism;Transmission mechanism adopts servo motor drive synchronous wheel group and belt;Speed simulation mechanism adopts side-by-side driven and driven magneto-rheological fluid roller, its internal electromagnetic coil changes magnetic field by current, adjusts magneto-rheological fluid state, to control roller surface stiffness and contact area with sensor in real time.Achieved high-precision non-slip transmission and multi-condition intelligent simulation, significantly improved detection precision, security and applicability, while reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of sensor detection technology, and in particular to a speed sensor detection device for a mining belt conveyor. Background Technology

[0002] Belt conveyors are key transportation equipment in mining production systems, and real-time and accurate monitoring of their operating status is crucial for ensuring safe production and preventing major accidents such as slippage and belt breakage. As a core monitoring component, the reliability and accuracy of speed sensors directly affect the effectiveness of the entire conveying system's safety early warning and control system.

[0003] Currently, there is a general lack of dedicated and efficient testing equipment for performance testing and periodic calibration of speed sensors in mining sites. Actual operation often relies on the subjective experience of technicians, making judgments indirectly or through comparison. This results in a lack of standardized procedures in the testing process, making it difficult to guarantee the consistency, reliability, and accuracy of calibration results. Furthermore, existing general-purpose or simple testing devices have limited functionality and cannot effectively simulate the various complex and variable operating conditions faced by conveyor belts in actual operation (such as slippage during start-up and shutdown, low-speed crawling after overload, and dynamic speed changes). Therefore, it is difficult to comprehensively and accurately evaluate the overall performance of speed sensors in real-world environments (such as response characteristics, low-speed resolution, and anti-interference capabilities).

[0004] While some technological attempts have been made to address the aforementioned issues, such as the invention patent CN105775664A which discloses a belt conveyor speed detection system based on radio frequency identification, it suffers from problems including the need to modify the conveyor belt (adding tags), susceptibility to environmental interference, and limited accuracy. Another utility model patent, CN205010961U, discloses a speed detection device based on a proximity switch, which similarly suffers from inherent drawbacks such as the need to modify the rollers (installing protrusions), the protrusions being prone to loosening or wear, high installation accuracy requirements, and inconvenient maintenance. These existing technologies have not fundamentally solved the need for on-site detection that requires no modification to the object being measured, offers high precision and reliability, and can simulate complex working conditions.

[0005] Therefore, there is an urgent need to develop a dedicated detection device for speed sensors of mining belt conveyors that has a reasonable structure, high detection accuracy, simple operation, and can actively simulate various actual working conditions, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0006] The purpose of this invention is to overcome the problems in the background art and provide a speed sensor detection device for mining belt conveyors.

[0007] The core technical idea of ​​this utility model lies in using magnetorheological fluid rollers as both the active and driven rollers. By adjusting the current of the electromagnetic coil in real time to change the state of the magnetorheological fluid, the surface stiffness of the rollers and the contact area with the sensor are dynamically adjusted. This achieves a large contact area and high starting torque during the start-up phase, and reduced contact during the running phase to reduce friction loss. Combined with a servo motor and synchronous belt drive system, it achieves slip-free, high-precision speed control, and can simulate various actual operating states such as normal start-stop, slippage conditions, and overload restart. It comprehensively detects the response characteristics, measurement accuracy, and shock resistance of the speed sensor under different operating conditions, and has the advantages of high detection accuracy, strong adaptability, low energy consumption, and good safety.

[0008] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a speed sensor detection device for a mining belt conveyor, used for detecting speed sensors, comprising: a transmission mechanism, a speed simulation mechanism, and a fixing mechanism;

[0009] The transmission mechanism includes a servo motor and a set of synchronous pulleys and a transmission belt driven by the servo motor;

[0010] The speed simulation mechanism includes an active roller and a driven roller arranged side by side, with a gap between the active roller and the driven roller for placing a speed sensor.

[0011] The fixing mechanism includes a motor frame for mounting the servo motor and a bearing housing assembly for supporting the driving roller and the driven roller.

[0012] The servo motor drives the active roller to rotate via a synchronous pulley set and a transmission belt, and the active roller then drives the driven roller to rotate synchronously via a transmission belt and a synchronous pulley set.

[0013] Both the active and driven rollers are magnetorheological fluid rollers, with electromagnetic coils inside. The magnetic field strength is adjusted by changing the current flowing through the electromagnetic coils, thereby changing the state of the magnetorheological fluid and adjusting the surface stiffness of the rollers and their contact area with the speed sensor in real time.

[0014] Furthermore, the magnetorheological fluid roller includes:

[0015] The cylinder body, a left end cap and a right end cap fixedly connected to both ends of the cylinder body, a mandrel passing through the inside of the cylinder body, an electromagnetic coil wound on the mandrel, a non-magnetic sleeve disposed inside the cylinder body and enclosing the electromagnetic coil, a magnetorheological fluid filled inside the cylinder body, and a rubber sleeve fitted on the outside of the cylinder body.

[0016] The outer wall of the rubber sleeve is in direct contact with the speed sensor. This structure effectively solves the problems of sealing, magnetic field construction, and flexible contact of the magnetorheological fluid roller, realizes the controllable encapsulation and isolation of the magnetorheological fluid, and provides a flexible contact surface through the outer rubber sleeve, which protects the sensor surface and ensures the effectiveness of friction force transmission.

[0017] Furthermore, the mandrel is provided with a lead hole for leading out the electromagnetic coil lead; the right end cover and / or the left end cover are provided with an injection hole for injecting magnetorheological fluid; this setting solves the problems of sealing and leading out the electromagnetic coil power supply lead, as well as the initial filling and subsequent maintenance of magnetorheological fluid, ensuring the reliability of the internal circuit of the device, facilitating the filling and replacement of magnetorheological fluid, and improving the maintainability and service life of the equipment.

[0018] Furthermore, the interior of the magnetorheological fluid roller is formed with:

[0019] The first chamber, formed by the non-magnetic sleeve, the left end cap, and the right end cap, is used to accommodate the mandrel and the electromagnetic coil.

[0020] The second chamber is formed by the outer wall of the non-magnetic sleeve, the inner wall of the cylinder, and the left and right end caps.

[0021] The third chamber is formed by the outer wall of the cylinder, the rubber sleeve, and the left and right end caps;

[0022] The second and third chambers are connected by a liquid inlet hole on the cylinder, and the magnetorheological fluid fills the second and third chambers. This multi-chamber structure solves the problem of effectively applying a magnetic field to the magnetorheological fluid in the working area. Its technical advantage lies in isolating the magnetic field through a non-magnetic sleeve, allowing the magnetic field energy to be concentrated on the magnetorheological fluid in the second and third chambers, significantly improving the magnetic field utilization efficiency and the response speed and control accuracy of the magnetorheological fluid's state changes.

[0023] Furthermore, the synchronous pulley set includes:

[0024] A first synchronous pulley fixedly mounted on the output shaft of the servo motor;

[0025] A second synchronous pulley is fixedly installed at one end of the drive roller;

[0026] A third synchronous pulley is fixedly installed at the other end of the drive roller;

[0027] A fourth synchronous pulley is fixedly installed at one end of the driven roller;

[0028] The first synchronous pulley and the second synchronous pulley are connected by a first transmission belt;

[0029] The third and fourth synchronous pulleys are connected by a second transmission belt. This transmission layout solves the problem of driving two rollers with a single motor while maintaining strict synchronization. By indirectly driving the driven roller through the active roller, it ensures the absolute consistency of the rotational speeds of the active and driven rollers, providing a stable and accurate speed input reference for the speed sensor.

[0030] Furthermore, the first, second, third, and fourth synchronous pulleys all have the same diameter. This arrangement solves the problems of complex speed ratio calculation and easy introduction of errors in the transmission system. Its technical effect is to simplify the speed ratio relationship of the transmission chain, so that there is a simple and clear proportional relationship between the output speed of the servo motor and the theoretical speed of the roller and speed sensor. This greatly facilitates the comparison and calculation of speed control and detection results, and improves detection accuracy and efficiency.

[0031] Furthermore, the bearing housing assembly includes:

[0032] Vertical bearing seats are respectively installed at both ends of the driving roller and both ends of the driven roller;

[0033] And a bearing housing base for mounting and fixing the vertical bearing housing. This fixing structure solves the problems of high-speed stable support and precise centering of the roller, providing a robust and stable rotational support for the roller, ensuring smooth operation and high concentricity of the roller, providing a reliable foundation for speed detection, and facilitating the installation and leveling of the entire device.

[0034] Furthermore, the ratio of the outer diameter of the speed sensor to the outer diameter of the driving or driven roller is between [range missing]. This ratio range solves the slippage or wear problem that may occur between the speed sensor and the driving roller due to the difference in linear velocity, optimizes the contact mechanics between the two, reduces relative slippage while ensuring sufficient traction, ensures the accuracy of speed transmission, and broadens the size range of detectable sensors.

[0035] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0036] This invention effectively solves the problem of inaccurate detection caused by transmission slippage in existing detection devices. By employing a multi-stage synchronous transmission structure consisting of a servo motor drive and a synchronous pulley and transmission belt, absolute synchronicity is ensured in the power transmission process from the motor to the driving roller and then to the driven roller, completely eliminating relative slippage. This design provides a highly accurate and stable standard speed input reference for the speed sensor, allowing inspectors to directly and reliably compare the sensor's displayed value with the set speed of the servo motor, thereby greatly improving the accuracy of the speed sensor's working precision and stability.

[0037] This invention successfully overcomes the limitations of traditional detection devices, which simulate only a single operating condition and cannot accurately reflect the performance of sensors in complex field environments. Its core lies in the use of magnetorheological fluid roller technology. By adjusting the current in the electromagnetic coil, the surface rigidity and contact area of ​​the roller can be changed in real time and actively. This allows a single device to accurately simulate multiple key operating conditions: providing a large contact area and high torque to prevent slippage during startup; reducing contact to decrease wear during operation; and simulating dynamic slippage through periodic current changes or overload restart through exceeding the rated current. This allows for a comprehensive evaluation of the sensor's response characteristics and measurement resolution under start-up, stop-start, slippage, and low-speed crawling conditions.

[0038] This invention significantly improves the economy, safety, and adaptability of the testing process. The magnetorheological fluid responds rapidly to changes in state and consumes little energy, demonstrating a marked energy saving compared to mechanical adjustment methods. The high efficiency of the synchronous belt drive further reduces energy loss. The outer rubber sleeve and adjustable stiffness design prevent scratches or overload impacts on the sensor caused by rigid contact, enhancing testing safety. Furthermore, the device has a rational structural layout and high integration, requiring no modification to the sensor under test. It is suitable for speed sensors of different sizes and specifications, greatly improving the equipment's versatility and the convenience of on-site calibration. Attached Figure Description

[0039] The accompanying drawings are provided to further understand 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 and do not constitute a limitation thereof.

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0041] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0042] Figure 3 This is a schematic diagram of the internal structure of the driving roller / driven roller.

[0043] The attached figures are labeled as follows:

[0044] 1-1. Servo motor; 1-2. First synchronous pulley; 1-3. First transmission belt; 1-4. Second synchronous pulley; 1-5. Third synchronous pulley; 1-6. Second transmission belt; 1-7. Fourth synchronous pulley;

[0045] 2-1. Driving roller; 2-1.1. Left end cap; 2-1.2. Rubber sleeve; 2-1.3. Magnetorheological fluid; 2-1.4. Non-magnetic sleeve; 2-1.5. Injection hole; 2-1.6. Electromagnetic coil; 2-1.7. Lead wire hole; 2-1.8. Right end cap; 2-1.9. Cylinder body; 2-1.10. Mandrel; 2-1.11. Inlet hole; 2-2. Speed ​​sensor; 2-3. Driven roller;

[0046] 3-1. Motor frame; 3-2. Vertical bearing housing; 3-3. Bearing housing base;

[0047] 4-1, First chamber; 4-2, Second chamber; 4-3, Third chamber. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only for explaining this utility model and are not intended to limit it.

[0049] Example

[0050] like Figures 1-3 As shown in the figure, this embodiment provides a speed sensor detection device for a mining belt conveyor, which mainly includes three parts: a transmission mechanism, a speed simulation mechanism, and a fixing mechanism.

[0051] The transmission mechanism consists of a servo motor 1-1, a first synchronous pulley 1-2, a second synchronous pulley 1-4, a third synchronous pulley 1-5, a fourth synchronous pulley 1-7, a first transmission belt 1-3, and a second transmission belt 1-6. The servo motor 1-1 serves as the power source, with its output shaft fixedly connected to the first synchronous pulley 1-2, providing precise and controllable speed input. The first synchronous pulley 1-2 is connected to the second synchronous pulley 1-4, mounted at one end of the driving roller 2-1, via the first transmission belt 1-3, transmitting power to the driving roller 2-1. The third synchronous pulley 1-5 at the other end of the driving roller 2-1 is connected to the fourth synchronous pulley 1-7, mounted at one end of the driven roller 2-3, via the second transmission belt 1-6, thereby driving the driven roller 2-3 to rotate synchronously. The core advantage of this multi-stage synchronous transmission layout is that it solves the technical challenge of driving two rollers with a single motor while maintaining absolute synchronization. Synchronous belt drive completely eliminates relative slippage in the transmission chain, ensuring a high degree of consistency in the rotational speeds of the driving roller 2-1 and the driven roller 2-3. This provides a stable, accurate, and known standard rotational speed reference for the speed sensor 2-2 being tested, which is a fundamental prerequisite for achieving high-precision detection. Furthermore, the design of all synchronous pulleys having the same diameter greatly simplifies the speed ratio relationship of the transmission system. For example, the ratio of the outer diameter of the speed sensor 2-3 to the outer diameter of the roller is set between 1 and 2; in this embodiment, it is set to 1.5. This results in a simple and clear linear ratio between the set rotational speed of the servo motor 1-1 and the theoretical rotational speed of the speed sensor 2-3, greatly facilitating calculation, control, and result comparison during the detection process, and significantly improving detection efficiency and accuracy.

[0052] The speed simulation mechanism is the core of this device for achieving multi-functional detection. It consists of an active roller 2-1 and a driven roller 2-3. The two rollers are arranged side by side, with a certain gap between them for placing the speed sensor 2-2 to be detected. Both rollers are intelligent rollers based on magnetorheological fluid 2-1.3 (MRF) technology. The specific structure of each magnetorheological fluid 2-1.3 roller includes: a cylinder body 2-1.9, a left end cap 2-1.1 and a right end cap 2-1.8 fixedly connected to the cylinder body 2-1.9 by bolts, a mandrel 2-1.10 passing through the inside of the cylinder body 2-1.9, an electromagnetic coil 2-1.6 tightly wound on the mandrel 2-1.10, a non-magnetic sleeve 2-1.4 for wrapping and isolating the electromagnetic coil 2-1.6, magnetorheological fluid 2-1.3 filled in a specific cavity, and a rubber sleeve 2-1.2 finally fitted on the outside of the cylinder body 2-1.9. The spindle 2-1.10 has a lead hole 2-1.7 for safely leading the lead wire of the electromagnetic coil 2-1.6 to an external power source; the right end cover 2-1.8 (or / and the left end cover 2-1.1) has a liquid injection hole 2-1.5 for initial filling and subsequent maintenance replenishment of the magnetorheological fluid 2-1.3.

[0053] The chamber design of the magnetorheological fluid 2-1.3 roller is key to its efficient operation: the first chamber 4-1 is formed by a non-magnetic sleeve 2-1.4 and left and right end caps 2-1.8, which safely accommodates the mandrel 2-1.10 and the electromagnetic coil 2-1.6; the second chamber 4-2 is formed by the outer wall of the non-magnetic sleeve 2-1.4, the inner wall of the cylinder 2-1.9, and the left and right end caps 2-1.8; and the third chamber 4-3 is formed by the outer wall of the cylinder 2-1.9, the rubber sleeve 2-1.2, and the left and right end caps 2-1.8. The second chamber 4-2 and the third chamber 4-3 are connected by multiple fluid inlets 2-1.11 evenly distributed on the cylinder 2-1.9, and the magnetorheological fluid 2-1.3 fills these two connected chambers. This multi-chamber structure solves the problem of precise magnetic field control and efficient utilization. The beneficial effect is achieved through the following process: when current passes through the electromagnetic coil 2-1.6, the generated magnetic field is effectively confined within the first chamber 4-1 by the non-magnetic sleeve 2-1.4, preventing the dispersion of magnetic energy. This allows the magnetic field energy to concentrate and penetrate the non-magnetic sleeve 2-1.4, efficiently acting on the magnetorheological fluid 2-1.3 in the second and third chambers 4-2 and 4-3. This significantly improves the utilization efficiency of the magnetic field, enabling the magnetorheological fluid 2-1.3 to rapidly (in milliseconds) change from a liquid to a near-solid state under an applied magnetic field. The state change response is extremely sensitive, thus achieving real-time, precise, and programmable control over the roller surface stiffness and its contact area with the speed sensor 2-2. The outer rubber sleeve 2-1.2 directly contacts the speed sensor 2-2; its flexibility provides sufficient friction while effectively protecting the expensive sensor surface from scratches, enhancing the safety of the test.

[0054] The fixing mechanism provides a stable foundation for the entire device, including a motor frame 3-1 for mounting and fixing the servo motor 1-1, and a bearing housing assembly for supporting the driving roller 2-1 and the driven roller. The bearing housing assembly consists of vertical bearing housings 3-2 respectively mounted at both ends of the two rollers and a bearing housing base 3-3 for mounting and fixing these bearing housings. This fixing structure solves the problems of stable support and high concentricity requirements for the rollers under high-speed and variable operating conditions. Its beneficial effects and positive impacts are: it provides a robust, stable, and flat mounting platform for the entire transmission and simulation system, ensuring precise alignment of the axes of the driving roller 2-1 and the driven roller and extremely smooth operation, eliminating additional errors caused by vibration or misalignment, and providing a reliable mechanical foundation for high-precision speed detection. At the same time, the modular base design facilitates on-site installation and leveling.

[0055] Working principles under various working conditions

[0056] This device can accurately simulate various typical working conditions faced by the speed sensor 2-2 on the underground belt conveyor by controlling the rotational speed of the servo motor 1-1 and the current of the magnetorheological fluid 2-1.3 roller electromagnetic coil 2-1.6, thereby enabling a comprehensive performance evaluation of it.

[0057] 1. Normal startup and operation condition detection

[0058] Startup Phase: Servo motor 1-1 is energized and begins to rotate; at this time, electromagnetic coil 2-1.6 is not energized. Magnetorheological fluid 2-1.3 maintains Newtonian fluid properties and remains liquid. The roller has low overall stiffness; under the pressure of the speed sensor 2-2's own weight, the outer rubber sleeve 2-1.2 undergoes elastic deformation, maximizing its contact area with the speed sensor 2-2. At this point, the roller provides very high friction and traction, providing sufficient starting torque for the speed sensor 2-2, ensuring rapid synchronous rotation between the sensor and the roller, effectively preventing detection failure due to initial slippage. This is crucial for testing the sensor's startup performance under low-speed, high-torque conditions.

[0059] Operational Phase: Once the speed sensor 2-2 accelerates with the roller to the predetermined detection speed and stabilizes, a certain control current is applied to the electromagnetic coil 2-1.6. The magnetic field causes the magnetorheological fluid 2-1.3 to undergo a phase change within milliseconds, resulting in a sharp increase in apparent viscosity and a near-solid state. The overall stiffness of the roller is significantly enhanced, suppressing deformation of the rubber sleeve 2-1.2 and reducing its contact area with the speed sensor 2-2. This not only reduces the sliding friction resistance and frictional heat generated between the roller and the sensor during high-speed operation, reducing wear on the sensor surface, but more importantly, it avoids measurement errors that may be caused by excessive contact pressure at high speeds. At this point, the system is in a stable, efficient, and low-wear operating state, allowing the operator to accurately compare the input speed of the servo motor 1-1 with the displayed value of the speed sensor to verify its measurement accuracy at high speeds.

[0060] 2. Slippage condition simulation test

[0061] To test the dynamic response characteristics and measurement accuracy of the speed sensor 2-2 under unsteady conditions such as conveyor belt slippage, this invention applies a periodically changing (e.g., square wave, sine wave) current signal to the electromagnetic coil 2-1.6 of the magnetorheological fluid 2-1.3 roller. The change in current causes a periodic change in the magnetic field strength, which in turn causes the state of the magnetorheological fluid 2-1.3 to switch rapidly and periodically between liquid and solid-like states. This causes the surface friction coefficient and output torque of the roller to fluctuate periodically. By precisely controlling the amplitude, frequency, and waveform of the current signal, different slippage rates (e.g., 5%, 10%, 20%) can be accurately reproduced between the roller and the speed sensor 2-2, thus comprehensively evaluating the sensor's tracking ability and measurement accuracy in complex dynamic processes.

[0062] 3. Overload restart (polar speed crawl) working condition simulation

[0063] When a conveyor restarts after being overloaded, it is often in an extremely low-speed crawling state, placing extremely high demands on the low-speed resolution and shock resistance of the speed sensor 2-2. To simulate this condition, a current far exceeding the rated value can be applied to the electromagnetic coil 2-1.6, causing the magnetorheological fluid 2-1.3 to reach its maximum stiffness, simulating extremely high starting resistance. The servo motor 1-1 is then set to operate at an extremely low speed, driving the sensor to rotate very slowly. Under this extremely low-speed crawling state, the speed sensor 2-2 can be tested with extremely high precision to effectively identify and measure speeds as low as a few revolutions per minute, verifying its minimum measurement resolution, accuracy near zero speed, and ability to withstand huge starting shocks.

[0064] In summary, this utility model, through its ingenious mechanical structure design and innovative application of intelligent material—magnetorheological fluid 2-1.3—successfully integrates functions such as high-precision transmission, multi-condition simulation, intelligent adjustment, and protection into one device. It provides a dedicated detection device for the speed sensor 2-2 of mining belt conveyors, which is characterized by high detection accuracy, comprehensive functions, strong applicability, and high safety and reliability. This effectively solves many shortcomings of existing technologies and has good application prospects.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 speed sensor detection device for a mining belt conveyor, used to detect speed sensors (2-2), characterized in that, include: Transmission mechanism, speed simulation mechanism, and stationary mechanism; The transmission mechanism includes a servo motor (1-1) and a synchronous pulley set and a transmission belt driven by the servo motor; The speed simulation mechanism includes an active roller (2-1) and a driven roller (2-3) arranged side by side, with a gap between the active roller (2-1) and the driven roller (2-3) for placing a speed sensor (2-2); The fixing mechanism includes a motor frame (3-1) for mounting the servo motor (1-1) and a bearing housing assembly for supporting the driving roller (2-1) and the driven roller (2-3); The servo motor (1-1) drives the active roller (2-1) to rotate through the synchronous pulley set and the transmission belt, and the active roller (2-1) then drives the driven roller (2-3) to rotate synchronously through the transmission belt and the synchronous pulley set; Both the active roller (2-1) and the driven roller (2-3) are magnetorheological fluid rollers, and an electromagnetic coil (2-1.6) is installed inside them. The magnetic field strength is adjusted by changing the current to the electromagnetic coil (2-1.6), thereby changing the state of the magnetorheological fluid (2-1.3) and adjusting the surface stiffness of the roller and its contact area with the speed sensor (2-2) in real time.

2. The speed sensor detection device for a mining belt conveyor according to claim 1, characterized in that, The magnetorheological fluid roller includes: The cylinder (2-1.9), the left end cap (2-1.1) and the right end cap (2-1.8) fixedly connected to both ends of the cylinder (2-1.9), the mandrel (2-1.10) passing through the inside of the cylinder (2-1.9), the electromagnetic coil (2-1.6) wound on the mandrel (2-1.10), the non-magnetic sleeve (2-1.4) disposed inside the cylinder (2-1.9) and enclosing the electromagnetic coil (2-1.6), the magnetorheological fluid (2-1.3) filled inside the cylinder (2-1.9), and the rubber sleeve (2-1.2) fitted on the outside of the cylinder (2-1.9); The outer wall of the rubber sleeve (2-1.2) is in direct contact with the speed sensor (2-2).

3. The speed sensor detection device for a mining belt conveyor according to claim 2, characterized in that, The mandrel (2-1.10) has a lead hole (2-1.7) for leading out the lead wire of the electromagnetic coil (2-1.6); the right end cover (2-1.8) and / or the left end cover (2-1.1) have injection holes (2-1.5) for injecting magnetorheological fluid (2-1.3).

4. A speed sensor detection device for a mining belt conveyor according to claim 2 or 3, characterized in that, The interior of the magnetorheological fluid roller is formed with: The first chamber (4-1), formed by the non-magnetic sleeve (2-1.4), the left end cap (2-1.1), and the right end cap (2-1.8), is used to accommodate the mandrel (2-1.10) and the electromagnetic coil (2-1.6); The second chamber (4-2) is formed by the outer wall of the non-magnetic sleeve (2-1.4), the inner wall of the cylinder (2-1.9), and the left end cap (2-1.1) and the right end cap (2-1.8); The third chamber (4-3) is formed by the outer wall of the cylinder (2-1.9), the rubber sleeve (2-1.2), the left end cap (2-1.1), and the right end cap (2-1.8); The second chamber (4-2) and the third chamber (4-3) are connected by a liquid inlet (2-1.11) provided on the cylinder (2-1.9), and the magnetorheological fluid (2-1.3) fills the second chamber (4-2) and the third chamber (4-3).

5. The speed sensor detection device for a mining belt conveyor according to claim 1, characterized in that, The synchronous wheel set includes: The first synchronous pulley (1-2) is fixedly installed on the output shaft of the servo motor (1-1); A second synchronous pulley (1-4) is fixedly installed at one end of the active roller (2-1); A third synchronous pulley (1-5) is fixedly installed at the other end of the active roller (2-1); The fourth synchronous pulley (1-7) is fixedly installed at one end of the driven roller (2-3); The first synchronous pulley (1-2) and the second synchronous pulley (1-4) are connected by a first transmission belt (1-3); The third synchronous pulley (1-5) and the fourth synchronous pulley (1-7) are connected by the second transmission belt (1-6).

6. The speed sensor detection device for a mining belt conveyor according to claim 5, characterized in that, The first synchronous pulley (1-2), the second synchronous pulley (1-4), the third synchronous pulley (1-5), and the fourth synchronous pulley (1-7) all have the same diameter.

7. The speed sensor detection device for a mining belt conveyor according to claim 1, characterized in that, The bearing housing assembly includes: Vertical bearing seats (3-2) are respectively installed at both ends of the driving roller (2-1) and the driven roller (2-3); And a bearing housing base (3-3) for mounting and fixing the vertical bearing housing (3-2).

8. The speed sensor detection device for a mining belt conveyor according to claim 1, characterized in that, The ratio of the outer diameter of the speed sensor (2-2) to the outer diameter of the driving roller (2-1) or the driven roller (2-3) is between 1 and 2.

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