Semi-direct-drive permanent magnet driving device and coal mine scraper conveyor

Abstract

The utility model relates to a semi-direct-drive permanent magnet driving device and a coal mine scraper conveyor, and relates to the technical field of mining transmission equipment, the semi-direct-drive permanent magnet driving device comprises a permanent magnet motor, and the permanent magnet motor comprises a rotating shaft; the speed reduction assembly and the permanent magnet motor are coaxially arranged, and the speed reduction assembly is installed on one side of the permanent magnet motor. The chain tightening assembly comprises a connecting cylinder, the connecting cylinder is installed on the side, away from the speed reducing assembly, of the permanent magnet motor, the installing base is arranged on the connecting cylinder, one end of the installing base is hinged to the connecting cylinder, and the other end of the installing base is provided with a telescopic piece connected with the connecting cylinder. The acting gear is located in the installation base which is communicated with the connecting cylinder, the idle gear is installed in a space formed by communication of the installation base and the connecting cylinder, the acting gear is in meshed connection with the idle gear, and the end of the rotating shaft is sleeved with a large gear which is located in the connecting cylinder. The chain tensioning device has the effects that the labor intensity and the misoperation risk are reduced, and the chain tensioning accuracy is improved.

Description

Technical Field

[0001] This application relates to the technical field of mining transmission equipment, and in particular to a semi-direct drive permanent magnet drive device and a coal mine scraper conveyor. Background Technology

[0002] In the coal mining industry, scraper conveyors, as one of the "three-machine matching" equipment in fully mechanized mining faces, are crucial for ensuring the normal operation of coal mining production. Traditional coal mine scraper conveyor drive systems mostly adopt a combination of asynchronous motors, hydraulic couplers, chain tensioning components, and reduction gears. This type of drive system suffers from complex structure, low transmission efficiency, low motor power density, and high maintenance costs. It is gradually being replaced by semi-direct drive permanent magnet motors, which have advantages such as compact structure, high torque at low speeds, smoother start-up, higher transmission efficiency, high motor power density, and simpler maintenance.

[0003] However, semi-direct drive permanent magnet motors cannot be matched with existing chain tensioning devices that are compatible with asynchronous motors, thus failing to achieve the chain tensioning function of scraper conveyors. Most existing hydraulic chain tensioning assemblies matched with semi-direct drive permanent magnet motors use a manual clutch mechanism. Engaging and disengaging between the hydraulic chain tensioning assembly and the permanent magnet motor requires manual operation of the clutch handle, resulting in low mechanization, complex operation, high labor intensity, susceptibility to human error, and increased operating costs of the scraper conveyor. Utility Model Content

[0004] To address the issue that most hydraulic chain tensioning assemblies use a manual clutch mechanism, requiring manual operation of the clutch handle to engage / disengage between the hydraulic chain tensioning assembly and the permanent magnet motor, which is complex, labor-intensive, and increases the operating cost of the scraper conveyor, this application provides a semi-direct drive permanent magnet drive device.

[0005] In a first aspect, this application provides a semi-direct drive permanent magnet drive device, which adopts the following technical solution:

[0006] A semi-direct drive permanent magnet drive device, comprising

[0007] A permanent magnet motor, the permanent magnet motor including a rotating shaft;

[0008] A speed reduction assembly, which is coaxially arranged with the permanent magnet motor and is installed on one side of the permanent magnet motor;

[0009] A chain tensioning assembly includes a connecting cylinder, a mounting base, an idler wheel, and a hydraulic chain tensioner. The connecting cylinder is mounted on the side of the permanent magnet motor away from the reduction assembly. The mounting base is disposed on the connecting cylinder, with one end hinged to the connecting cylinder and the other end having a telescopic member connected to the connecting cylinder. The fixed end of the telescopic member is hinged to the connecting cylinder, and the movable end of the telescopic member is rotatably disposed on the end of the mounting base away from the connecting cylinder. The hydraulic chain tensioner is mounted on the mounting base, with one end driven by an actuating gear located within the mounting base. The mounting base and the connecting cylinder are in communication. The idler wheel is installed within the space formed by the connection between the mounting base and the connecting cylinder, and the actuating gear meshes with the idler wheel for transmission. A large gear is sleeved at the end of a rotating shaft, located within the connecting cylinder. By driving the telescopic member, the mounting base is rotatably disposed on the connecting cylinder so that the idler wheel meshes with or disengages from the large gear.

[0010] By adopting the above technical solution, the permanent magnet motor, as the power core, efficiently converts electrical energy into mechanical energy, providing stable power output for the entire drive device. The reduction gear is coaxially arranged with the permanent magnet motor, which can convert the high-speed, low-torque power output of the permanent magnet motor into low-speed, high-torque power, which can match the load requirements and improve the applicability of the drive device. In the chain tensioning assembly, the telescopic component drives the mounting base to rotate around the hinge point, so that the idler wheel can accurately engage or disengage with the large gear. The hydraulic chain tensioner provides stable and controllable tension to the chain through the transmission between the gear and the idler wheel, realizing the integrated automatic control of the drive device's power transmission and chain tensioning. Compared with the traditional manual adjustment method, the chain tensioning efficiency and accuracy are greatly improved.

[0011] Optionally, the connecting cylinder includes a cover and a base plate. The base plate is disposed on the cover and is connected to the cover. The mounting base is mounted on the base plate. The cover is mounted on one side of the permanent magnet motor. The large gear is located inside the cover. A protective cover is installed on the side of the cover away from the permanent magnet motor.

[0012] By adopting the above technical solution, the connection between the cover and the base plate provides sufficient installation and transmission space for the large gear and idler gear, effectively avoiding interference from external debris in the transmission process; the base plate serves as a fixed carrier for the mounting seat, ensuring its rotational stability, while the protective cover provides protection for the transmission components inside the cover, preventing dust, gravel, etc. from entering, extending the service life of key components such as the large gear, and ensuring the reliability of the drive device operation.

[0013] Optionally, the cover is provided with a first connecting window, the base plate is provided with a second connecting window, the mounting base is hollow, and the mounting base is provided with a third connecting window on the side near the base plate. The first connecting window, the second connecting window and the third connecting window are connected in sequence so that the idler wheel and the large gear are engaged or disengaged.

[0014] By adopting the above technical solution, the first, second, and third connecting windows are sequentially connected, providing a transmission channel. This allows the idler wheel to engage or disengage with the large gear without obstruction under the drive of the mounting base, effectively reducing the risk of interference during transmission, ensuring that the chain tensioning assembly can respond quickly, and achieving flexible switching of the chain tension state, thereby improving the smoothness and stability of the chain tensioning operation.

[0015] Optionally, one end of the substrate is provided with a first hinge shaft, a first support, and a second support. The first support is installed on one side of the substrate, and the second support is installed on the other side of the substrate. One end of the first hinge shaft is disposed on the first support, and the other end is disposed on the second support. One end of the mounting seat is sleeved on the first hinge shaft so that the mounting seat rotates about the first hinge shaft as a rotation axis.

[0016] By adopting the above technical solution, the first support and the second support, together with the first hinge shaft, provide a stable and flexible rotation fulcrum for the mounting base. This allows the mounting base to swing around the first hinge shaft with a precise and controllable angle under the drive of the telescopic component, thereby ensuring that the meshing position of the idler wheel and the large gear is accurate and providing a structural basis for the precise control of chain tension.

[0017] Optionally, a third support is provided at the other end of the substrate, a second hinge shaft is mounted on the third support, the fixed end of the telescopic member is sleeved on the second hinge shaft, a fourth support is mounted on the mounting base, a third hinge shaft is provided on the fourth support, and a collar is connected to the movable end of the telescopic member, the collar is sleeved on and rotates on the third hinge shaft.

[0018] By adopting the above technical solution, the second hinge shaft and the third hinge shaft provide hinge support for the fixed end and the movable end of the telescopic component, respectively. With the rotational connection of the collar, the telescopic component can smoothly drive the mounting seat to swing during the telescopic process, ensuring smooth and uninterrupted power transmission. At the same time, it can precisely control the swing amplitude of the mounting seat, thereby achieving stable adjustment of the meshing state between the idler wheel and the large gear.

[0019] Optionally, a support plate is installed inside the connecting cylinder, and a proximity switch is provided on the support plate. The proximity switch and the meshing position of the large gear and the idler gear are in the same horizontal direction.

[0020] By adopting the above technical solution, the proximity switch is installed on the support plate corresponding to the meshing position of the large gear and the idler gear. It can monitor the meshing state of the two in real time. When the idler gear and the large gear approach the preset meshing position, the proximity switch immediately feeds back a signal to control the telescopic component to stop moving, effectively avoiding over-meshing and ensuring the safety of gear transmission. At the same time, it provides a reliable detection method for the automatic control of the drive device.

[0021] Optionally, the permanent magnet motor further includes a housing, a rotor, and a stator. The rotor is coaxial with the rotating shaft and is sleeved on the rotating shaft. The stator is coaxial with the rotating shaft and is sleeved on the rotor.

[0022] By adopting the above technical solution, the rotor and stator are coaxially nested on the rotating shaft, forming the core electromagnetic conversion structure of the permanent magnet motor. Under the action of the rotating magnetic field generated by the stator, the rotor converts electromagnetic force into mechanical energy of the rotating shaft, realizing efficient and stable energy conversion and providing a continuous and reliable power source for the drive device.

[0023] Optionally, a cooling pipe is provided on the side of the housing near the stator, with one end of the cooling pipe connected to an oil inlet pipe and the other end connected to an oil outlet pipe.

[0024] By adopting the above technical solution, the cooling pipe coiled around the housing near the stator side forms a circulating oil circuit through the oil inlet and outlet pipes, which can promptly remove the heat generated by the permanent magnet motor during operation, effectively reduce the working temperature of the stator and rotor, avoid motor performance degradation or damage due to overheating, improve the working stability and service life of the permanent magnet motor, and ensure the long-term efficient operation of the drive device.

[0025] Secondly, this application provides a scraper conveyor for coal mines, which adopts the following technical solution:

[0026] A coal mine scraper conveyor includes a semi-direct drive permanent magnet drive device as described in any of the above embodiments.

[0027] By adopting the above technical solution, the semi-direct drive permanent magnet drive device is applied to the coal mine scraper conveyor, giving full play to its advantages of high-efficiency transmission and intelligent chain tensioning, providing a stable and strong driving force for the scraper conveyor, and automatically adjusting the scraper chain tension to effectively reduce chain slack, chain skipping and other failures. Compared with the traditional drive method, it greatly improves the operating efficiency and safety of the coal mine scraper conveyor, and reduces equipment maintenance costs and manual labor intensity.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This semi-direct drive permanent magnet drive device, through the coordinated arrangement of a permanent magnet motor, a reduction gear assembly, and a chain tensioning assembly, constitutes an efficient and stable integrated system for power transmission and chain tensioning. The permanent magnet motor provides power to the device; the reduction gear assembly can adjust the speed and torque to adapt to different working conditions; in the chain tensioning assembly, the telescopic component drives the mounting base to rotate around the hinge point, realizing the precise engagement or disengagement of the idler wheel and the large gear. In conjunction with the hydraulic chain tensioner, through the transmission between the gear and the idler wheel, it provides a stable and controllable tension force to the chain. The automated chain tensioning operation replaces manual adjustment, reducing labor intensity and the risk of operational errors, while improving the accuracy and consistency of chain tensioning, reducing equipment wear, and extending service life.

[0030] 2. The three connecting windows, namely the first, second, and third connecting windows, are sequentially connected to provide a transmission channel. This allows the idler wheel to engage or disengage with the large gear without obstruction under the drive of the mounting base, effectively reducing the risk of interference during transmission, ensuring that the chain tensioning assembly can respond quickly, and achieving flexible switching of the chain tension state, thereby improving the smoothness and stability of the chain tensioning operation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the meshing connection between the idler gear and the large gear in an embodiment of this application;

[0032] Figure 2 This is a front view of the meshing connection between the idler gear and the large gear in an embodiment of this application;

[0033] Figure 3 yes Figure 2 Sectional view of AA;

[0034] Figure 4 This is a schematic diagram of the structure of the connecting cylinder and the large gear in the embodiments of this application;

[0035] Figure 5 This is a schematic diagram of the mounting base, idler wheel, and hydraulic chain tensioner in the embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the structure in which the working gear, idler gear and large gear are sequentially meshed and connected in an embodiment of this application;

[0037] Figure 7 This is a partial structural diagram of the meshing connection between the idler gear and the large gear in an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Permanent magnet motor; 11. Housing; 12. Rotor; 13. Stator; 14. Cooling pipe; 15. Oil inlet pipe; 16. Oil outlet pipe; 17. Rotating shaft; 18. Large gear; 2. Reduction assembly; 3. Chain tensioning assembly; 31. Connecting cylinder; 311. Cover; 3111. First connecting window; 312. Base plate; 3121. Second connecting window; 313. Protective cover; 314. First hinge shaft; 315. First support; 316. Second support; 32. Mounting base; 321. Third support; 322. Second hinge shaft; 323. Fourth support; 324. Third hinge shaft; 325. Collar; 326. Third connecting window; 33. Idler wheel; 34. Telescopic component; 35. Hydraulic chain tensioner; 36. Actuating gear; 37. Support plate; 371. Proximity switch. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0044] Example 1

[0045] This application discloses a semi-direct drive permanent magnet drive device, referring to... Figures 1-3 A semi-direct drive permanent magnet drive device includes a permanent magnet motor 1, a reduction gear assembly 2, and a chain tensioning assembly 3. The permanent magnet motor 1 includes a rotating shaft 17; the reduction gear assembly 2 is coaxially arranged with the permanent magnet motor 1 and is installed on one side of the permanent magnet motor 1; the chain tensioning assembly 3 includes a connecting cylinder 31, a mounting base 32, an idler wheel 33, and a hydraulic chain tensioner 35. The connecting cylinder 31 is installed on the side of the permanent magnet motor 1 away from the reduction gear assembly 2. The mounting base 32 is disposed on the connecting cylinder 31. One end of the mounting base 32 is hinged to the connecting cylinder 31, and the other end is provided with a telescopic member 34 connected to the connecting cylinder 31. The fixed end of the telescopic member 34 is hinged to the connecting cylinder 31. The movable end of the 4 is rotatably set at the end of the mounting base 32 away from the connecting cylinder 31. The hydraulic chain tensioner 35 is installed on the mounting base 32. One end of the hydraulic chain tensioner 35 is driven and connected to the action gear 36. The action gear 36 is located inside the mounting base 32. The mounting base 32 and the connecting cylinder 31 are connected. The idler wheel 33 is installed in the space formed by the connection between the mounting base 32 and the connecting cylinder 31. The action gear 36 and the idler wheel 33 are meshed and connected for transmission. The end of the rotating shaft 17 is fitted with a large gear 18. The large gear 18 is located inside the connecting cylinder 31. By driving the telescopic member 34, the mounting base 32 is rotatably set on the connecting cylinder 31 so that the idler wheel 33 is meshed with or disengaged from the large gear 18.

[0046] In this semi-direct drive permanent magnet drive device, the permanent magnet motor 1 serves as the core power source. Through the electromagnetic induction effect between its internal permanent magnets and the stator windings 13, it efficiently converts electrical energy into mechanical energy, driving the rotating shaft 17 to rotate continuously and stably, providing stable power output for the subsequent transmission system. The reduction gear assembly 2 is coaxially and tightly connected to the permanent magnet motor 1, converting the high-speed, low-torque power output by the permanent magnet motor 1 into low-speed, high-torque power through a gear transmission system. This meets the specific torque and speed requirements of actual loads, such as in mining conveying, where it can drive a fully loaded scraper conveyor chain. Simultaneously, the coaxial design significantly reduces the radial dimension of the device, making the overall structure more compact and facilitating installation and maintenance in space-constrained underground environments.

[0047] In the chain tensioning assembly 3, the connecting cylinder 31 provides a supporting foundation for the mounting base 32. The connecting cylinder 31 can be made of high-strength material to withstand the mechanical stress under heavy load conditions, ensuring the stable operation of the chain tensioning assembly 3. One end of the mounting base 32 is connected to the connecting cylinder 31 through a hinge structure, forming a rotatable mechanical connection; the other end is movably connected to the telescopic member 34. The mounting base 32 can support components such as the hydraulic chain tensioner 35 and the idler wheel 33, and swings around the hinge point under the drive of the telescopic member 34 to realize the switching of the meshing state between the idler wheel 33 and the large gear 18, ensuring that the idler wheel 33 and the large gear 18 are in the correct meshing position each time, thereby ensuring the stability of the chain tension and improving the reliability and efficiency of the chain tensioning operation.

[0048] Specifically, the telescopic component 34 is hinged at both ends to the connecting cylinder 31 and the mounting base 32, respectively. The telescopic component 34 drives the telescopic movement, which in turn pushes the mounting base 32 to rotate around the hinge point, controlling the engagement or disengagement of the idler wheel 33 with the large gear 18. The telescopic component 34 can be a hydraulic cylinder or an electric cylinder. Hydraulic drive has the advantages of fast response and stable thrust, enabling the idler wheel 33 to be adjusted in a short time, thus achieving rapid adjustment of the chain tension. Compared with traditional manual adjustment methods, the degree of automation is greatly improved, allowing for real-time adjustment according to load changes, effectively reducing the intensity of manual operation and the risk of error.

[0049] In this application, the telescopic component 34 is an electric cylinder. The electric cylinder incorporates high-precision lead screws, guide rails, and other components, ensuring smooth and stable operation with minimal transmission clearance and high positioning accuracy. This minimizes the rotational error of the mounting base 32, ensuring accurate engagement of the idler wheel 33 and the large gear 18 each time. Compared to hydraulic and pneumatic telescopic methods, it offers higher energy conversion efficiency and reduces energy loss. Its power output, speed, and direction can be precisely adjusted via a servo control system, meeting the different rotational speeds and angles required by the mounting base 32 in the semi-direct drive permanent magnet drive device, thus achieving precise engagement or disengagement control of the idler wheel 33 and the large gear 18. Furthermore, the electric cylinder eliminates the need for complex hydraulic lines and pneumatic components, avoiding issues such as hydraulic oil leakage and air leakage from pneumatic components, reducing maintenance work such as seal replacement and cleaning of oil and air circuits.

[0050] The hydraulic chain tensioner 35 is mounted on the mounting base 32. The hydraulic chain tensioner 35 converts hydraulic energy into mechanical energy, driving the actuating gear 36 to rotate. The actuating gear 36 meshes with the idler gear 33, transmitting power to the idler gear 33 and providing a stable and controllable tension to the chain. The hydraulic chain tensioner 35 itself allows for stepless adjustment of the tension. Through a pressure sensor and control system, it can precisely control the chain tension, ensuring the chain is always at its optimal tension.

[0051] The idler wheel 33 is installed in the space connecting the mounting base 32 and the connecting cylinder 31. By meshing with the large gear 18, it transmits the power of the permanent magnet motor 1 to the chain and achieves chain tension by adjusting its own position. The large gear 18, as a key node for power transmission, transmits the torque of the rotating shaft 17 to the idler wheel 33. The meshing between the idler wheel 33 and the large gear 18 ensures the smoothness and reliability of power transmission and reduces the impact and vibration during the transmission process.

[0052] This semi-direct drive permanent magnet drive unit, through the coordinated arrangement of a permanent magnet motor 1, a reduction gear assembly 2, and a chain tensioning assembly 3, constitutes an integrated system for efficient and stable power transmission and chain tensioning. The permanent magnet motor 1 serves as the power core, providing strong power to the unit. The reduction gear assembly 2 is coaxially arranged with the permanent magnet motor 1, precisely adjusting the speed and torque to adapt to different working conditions. In the chain tensioning assembly 3, the telescopic component 34 drives the mounting base 32 to rotate around the hinge point, achieving precise engagement or disengagement of the idler wheel 33 and the large gear 18. Combined with the hydraulic chain tensioner 35, which, through the transmission between the action gear 36 and the idler wheel 33, provides a stable and controllable tension force to the chain. This unit effectively solves the problems of low efficiency and complex chain tensioning operations in traditional drive systems, improves power transmission efficiency, can quickly respond to load changes, and ensures stable equipment operation. Automated chain tensioning operations replace manual adjustments, reducing labor intensity and the risk of operational errors, while improving the accuracy and consistency of chain tensioning, reducing equipment wear, and extending service life.

[0053] refer to Figure 2 The connecting cylinder 31 includes a cover 311 and a base plate 312. The base plate 312 is disposed on the cover 311 and is connected to the cover 311. The mounting base 32 is mounted on the base plate 312. The cover 311 is mounted on one side of the permanent magnet motor 1. The large gear 18 is located inside the cover 311. A protective cover 313 is installed on the side of the cover 311 away from the permanent magnet motor 1. The interior of the cover 311 is used to accommodate the large gear 18 and provide space for the rotation of the large gear 18. The base plate 312 can ensure the stability of the mounting base 32 when it performs swinging or other actions. The connection between the base plate 312 and the cover 311 allows the internal space to be unobstructed, ensuring that the meshing transmission between the idler wheel 33 and the large gear 18 can be carried out smoothly. It also helps to install and maintain internal components.

[0054] The protective cover 313, together with the cover cylinder 311 and the base plate 312, forms a closed protective space, isolating the internal transmission components from the external environment and preventing impurities such as dust, gravel, and moisture from entering, thus protecting the idler wheel 33, the large gear 18, and other transmission components. Furthermore, the protective cover 313, cover cylinder 311, and base plate 312, through their high-strength materials and sealing design, can effectively resist the impact and erosion of dust and gravel in harsh environments such as underground coal mines, reducing wear on the large gear 18 caused by external impurities, extending its service life, and preventing transmission failures caused by foreign objects jamming, ensuring the stable operation of the semi-direct drive permanent magnet drive device.

[0055] Multiple support plates can be connected between the base plate 312 and the cover 311. The support plates are used to enhance the overall structural strength and stability of the connecting cylinder 31. The base plate 312 and the cover 311 are firmly connected as a whole by welding or bolting. This not only bears the load generated when the mounting base 32, idler wheel 33 and other components are working, but also effectively resists external impacts and vibrations.

[0056] refer to Figures 4-6 The housing 311 has a first connecting window 3111, the base plate 312 has a second connecting window 3121, and the mounting base 32 is hollow. A third connecting window 326 is located on the side of the mounting base 32 closest to the base plate 312. The first connecting window 3111, the second connecting window 3121, and the third connecting window 326 are sequentially connected to allow the idler wheel 33 to engage or disengage with the large gear 18. The first connecting window 3111 provides a spatial interface for the engagement of the idler wheel 33 and the large gear 18, allowing the idler wheel 33 to smoothly enter the internal transmission system from outside the housing 311 under the drive of the mounting base 32. Its position precisely matches the circular motion trajectory of the large gear 18, ensuring that the idler wheel 33 can smoothly approach and engage with the large gear 18 through this window. Simultaneously, the edges of the first connecting window 3111 are chamfered or rounded to reduce the risk of motion interference.

[0057] The second connecting window 3121 connects to the first connecting window 3111, providing a movement path for the idler wheel 33. Precise dimensional control ensures that the idler wheel 33 can achieve its meshing trajectory with the large gear 18 without interference, guaranteeing the meshing accuracy between the idler wheel 33 and the large gear 18. The third connecting window 326 directly connects to the second connecting window 3121, forming a complete transmission channel. The hollow structure inside the mounting base 32 provides installation space for the idler wheel 33. The dimensions of the third connecting window 326 are precisely calculated based on the maximum swing angle of the idler wheel 33, ensuring that the idler wheel 33 can move freely throughout its entire working range.

[0058] The first connecting window 3111, the second connecting window 3121, and the third connecting window 326 form an efficient transmission channel, enabling the idler wheel 33 to engage or disengage with the large gear 18 under the drive of the mounting base 32, thereby completing the chain tensioning function. This configuration organically combines the drive system and the chain tensioning system, realizing integrated control of power transmission and chain tensioning, and providing a strong guarantee for the safe and reliable operation of the coal mine scraper conveyor.

[0059] refer to Figure 1 , Figures 4 to 6The substrate 312 has a first hinge shaft 314, a first support 315, and a second support 316 at one end. The first support 315 is mounted on one side of the substrate 312, and the second support 316 is mounted on the other side of the substrate 312. One end of the first hinge shaft 314 is mounted on the first support 315, and the other end is mounted on the second support 316. One end of the mounting base 32 is sleeved on the first hinge shaft 314, allowing the mounting base 32 to rotate about the first hinge shaft 314 as a rotation axis. The substrate 312 provides a stable mounting platform for the first support 315 and the second support 316. The first support 315 and the second support 316 serve as support components for the first hinge shaft 314, engaging with the first hinge shaft 314 through machined shaft holes to provide positioning and support for the first hinge shaft 314.

[0060] The first hinge shaft 314 passes through the first support 315 and the second support 316, and is fitted with one end of the mounting base 32 to form a rotating pair. Under the drive of the telescopic member 34, the first hinge shaft 314 allows the mounting base 32 to rotate flexibly around it, thereby driving the idler wheel 33 to engage or disengage with the large gear 18, realizing rapid engagement and switching between the idler wheel 33 and the large gear 18, and improving the chain tensioning efficiency. At the same time, a sealing and lubrication structure is provided at the fitting point of the first hinge shaft 314 with the first support 315 and the second support 316 to prevent dust and impurities from entering, and to reduce friction and wear at the hinged parts, thereby ensuring the long-term stable and reliable operation of the chain tensioning assembly 3.

[0061] A third support 321 is provided at the other end of the substrate 312. A second hinge shaft 322 is mounted on the third support 321. The fixed end of the telescopic member 34 is sleeved on the second hinge shaft 322. A fourth support 323 is mounted on the mounting base 32. A third hinge shaft 324 is provided on the fourth support 323. A collar 325 is connected to the movable end of the telescopic member 34. The collar 325 is sleeved on and rotates on the third hinge shaft 324. The third support 321 serves as a support carrier for the fixed end of the telescopic member 34, providing a stable mounting base for the second hinge shaft 322. The mounting surface and positioning holes on the third support 321 ensure the installation requirements of the second hinge shaft 322, while bearing the tension and pressure generated by the telescopic member 34 during operation, and evenly transmitting the load to the substrate 312. The second hinge shaft 322, through its sleeved fit with the fixed end of the telescopic member 34, forms a hinged rotating pair, allowing the telescopic member 34 to change angles during operation, while transmitting telescopic force.

[0062] The fourth support 323 provides installation support for the third hinge shaft 324, transmits the force of the movable end of the telescopic member 34 to the mounting base 32, and at the same time ensures the installation accuracy of the third hinge shaft 324, so that the collar 325 can rotate flexibly around the third hinge shaft 324, and the mounting base 32 rotates smoothly under the drive of the telescopic member 34, realizing the precise meshing adjustment of the idler wheel 33 and the large gear 18.

[0063] Specifically, the third hinge shaft 324 cooperates with the collar 325 at the movable end of the telescopic member 34 to form another key hinge point for the rotation of the mounting base 32. The third hinge shaft 324 can support the rotation of the collar 325 and also convert the telescopic movement of the telescopic member 34 into the swing of the mounting base 32. Through the synergistic effect with the first hinge shaft 314, the precise angle adjustment of the mounting base 32 can be achieved, thereby controlling the meshing state of the idler wheel 33 and the large gear 18.

[0064] refer to Figure 6 A support plate 37 is installed inside the connecting cylinder 31, and a proximity switch 371 is mounted on the support plate 37. The proximity switch 371 and the meshing positions of the large gear 18 and the idler wheel 33 are in the same horizontal direction. The support plate 37 provides an installation position for the proximity switch 371. The support plate 37 can be fixed to the inner wall of the connecting cylinder 31 by welding or bolting to ensure that it will not be displaced due to vibration or impact during operation. At the same time, the support plate 37 provides corresponding mounting holes and wiring channels for the proximity switch 371, ensuring the convenience and safety of the installation of the proximity switch 371. The proximity switch 371 can monitor the meshing state of the idler wheel 33 and the large gear 18 in real time. By sensing the metal parts of the large gear 18 or the idler wheel 33, the proximity switch 371 can accurately determine whether the two have entered the meshing state and whether the meshing position is accurate.

[0065] When the gear is detected to be approaching the preset meshing position, the proximity switch 371 immediately sends an electrical signal to the control system, and the telescopic component 34 stops moving, realizing automated control of the chain tensioning assembly 3. When an abnormal meshing is detected, the system can immediately issue an alarm and stop the equipment operation, preventing equipment failures and safety accidents caused by chain tension problems, and providing strong support for safe production in harsh working environments such as coal mines. The rapid response of the proximity switch 371 enables the control system to adjust the movement of the telescopic component 34 in a timely manner, reducing the occurrence of over-meshing or under-meshing, effectively protecting the gear transmission components, and improving the efficiency and accuracy of chain tensioning operation.

[0066] refer to Figures 1 to 3 , Figure 7 The permanent magnet motor 1 also includes a housing 11, a rotor 12, and a stator 13. The rotor 12 is coaxially arranged with the rotating shaft 17 and is sleeved on the rotating shaft 17. The stator 13 is coaxially arranged with the rotating shaft 17 and is sleeved on the rotor 12. The housing 11 serves as the external protective structure of the permanent magnet motor 1, providing physical protection for the internal rotor 12, stator 13, etc., and can resist the intrusion of external dust, water vapor, and gravel. At the same time, it provides installation support for the internal components of the motor and withstands the electromagnetic force and mechanical vibration generated during motor operation.

[0067] The rotor 12 is coaxially arranged with the rotating shaft 17 and is sleeved on the rotating shaft 17. Multiple sets of high-performance permanent magnets are embedded inside the rotor 12. Under the action of the rotating magnetic field generated by the stator 13, the permanent magnets on the rotor 12 are driven by electromagnetic force, which drives the rotating shaft 17 to rotate and converts electromagnetic energy into mechanical energy output.

[0068] The stator 13 consists of an iron core and three-phase windings wound around it. When three-phase alternating current is applied, the stator 13 windings generate a rotating magnetic field, which interacts with the permanent magnet of the rotor 12, driving the rotor 12 to rotate. The permanent magnet motor 1 has an internal cooling system, but this system is prone to leakage and its cooling effect is insufficient to cool the heat generated during operation. Therefore, a cooling pipe 14 is coiled on the side of the housing 11 near the stator 13. One end of the cooling pipe 14 is connected to an oil inlet pipe 15, and the other end is connected to an oil outlet pipe 16. The cooling pipe 14, coiled on the side of the housing 11 near the stator 13, is made of copper tubing with excellent thermal conductivity, forming a closed-loop oil circulation circuit. The circulating medium in the cooling pipe 14 is a cooling medium such as L-HM anti-wear hydraulic oil. The oil pump is started and stopped automatically by a temperature control sensor, achieving automatic oil temperature regulation. The oil inlet pipe 15 connects to an external cooling oil pump, delivering low-temperature cooling oil to the cooling pipe 14, while the oil outlet pipe 16 returns the hot oil, after absorbing heat, to the cooling system for further cooling. The cooling pipe 14 is tightly attached to the housing 11 and quickly removes the heat generated by the stator 13 and rotor 12 during operation through heat conduction, so that the internal temperature of the motor is always kept within a reasonable range, reducing the demagnetization of permanent magnets due to high temperature, ensuring the stable performance of the motor, and extending the service life of the insulation material.

[0069] The device also includes a frequency converter, which is installed on the outside of the permanent magnet motor 1. The frequency converter is connected to the permanent magnet motor 1 through communication. Through frequency conversion control technology, the speed can be precisely adjusted to flexibly adapt to the power requirements under different working conditions. For example, when the scraper conveyor in the coal mine is started under heavy load, it can output a large torque instantly to ensure the stable operation of the equipment.

[0070] The reduction gear assembly 2 includes planetary gears. The planetary gear transmission consists of a sun gear, planet gears, a ring gear, and a planet carrier. It achieves speed reduction through multi-tooth meshing and has a high load-bearing capacity, converting the high-speed power output from the permanent magnet motor 1 into low-speed, high-torque power. In addition, the planetary gear reduction assembly 2, which is coaxially arranged with the permanent magnet motor 1, can directly receive the power output from the rotating shaft 17, reducing the complexity of the transmission structure and simplifying the axial layout of the overall device.

[0071] The implementation process of a semi-direct drive permanent magnet drive device according to an embodiment of this application is as follows: When the device is started, the frequency converter adjusts the power frequency and voltage of the input permanent magnet motor 1 according to a preset program or external control command. The permanent magnet motor 1 efficiently converts electrical energy into mechanical energy, driving the rotating shaft 17 to rotate. The large gear 18 at the end of the rotating shaft 17 rotates accordingly. At this time, if it is necessary to tension the scraper chain, the telescopic member 34 retracts.

[0072] The fixed end of the telescopic component 34 is hinged to the second hinge shaft 322 of the third support 321 of the connecting cylinder 31, and the movable end is sleeved on the third hinge shaft 324 of the fourth support 323 of the mounting base 32 via a collar 325. As the telescopic component 34 retracts, the mounting base 32 rotates around the first hinge shaft 314, causing the idler wheel 33 inside the mounting base 32 to move closer to the large gear 18. When the idler wheel 33 and the large gear 18 reach the preset meshing position, the proximity switch 371 installed on the inner support plate 37 of the connecting cylinder 31 detects the signal and feeds it back to the control system. The control system then stops the telescopic component 34 from moving, so that the idler wheel 33 and the large gear 18 are stably meshed.

[0073] At this time, the hydraulic chain tensioner 35 on the mounting base 32 is activated, and the hydraulic energy drives the operating gear 36 to rotate. The operating gear 36 meshes with the idler wheel 33, transmitting power to the idler wheel 33, which then transmits the power to the large gear 18, thereby achieving tensioning of the scraper chain. During the transmission process, the reduction assembly 2 converts the high-speed, low-torque power output from the permanent magnet motor 1 into low-speed, high-torque power, adapting to the power requirements for scraper chain tensioning and equipment operation.

[0074] During operation, if the load changes, the frequency converter monitors and adjusts the speed and torque output of the permanent magnet motor 1 in real time. At the same time, the circulating oil circuit in the cooling pipe 14 continuously removes the heat generated by the stator 13 and rotor 12 of the permanent magnet motor 1, maintaining a stable operating temperature for the motor. When it is necessary to release the chain tension, the hydraulic system controls the extension component 34 to extend, driving the mounting base 32 to rotate in the opposite direction, causing the idler wheel 33 to disengage from the large gear 18, thus completing the switch of the chain tension function.

[0075] Example 2

[0076] This application also provides a coal mine scraper conveyor, including the semi-direct drive permanent magnet drive device described in the above embodiments. This coal mine scraper conveyor uses the aforementioned semi-direct drive permanent magnet drive device as its core power source and chain tensioning system. Through the efficient electrical-to-mechanical energy conversion characteristics of the permanent magnet motor 1, the precise torque adjustment function of the reduction gear assembly 2, and the automated tension control of the chain tensioning assembly 3, it provides stable and powerful power output to the scraper conveyor and achieves intelligent adjustment of the scraper chain tension. All components in the drive device operate collaboratively, the frequency converter dynamically adapts to load changes, and the cooling system ensures stable motor operation, ensuring continuous and reliable operation of the scraper conveyor during coal mining and transportation.

[0077] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A semi-direct drive permanent magnet drive device, characterized in that: include A permanent magnet motor (1), the permanent magnet motor (1) includes a rotating shaft (17); The deceleration assembly (2) is coaxially arranged with the permanent magnet motor (1) and is installed on one side of the permanent magnet motor (1); The chain tensioning assembly (3) includes a connecting cylinder (31), a mounting base (32), an idler wheel (33), and a hydraulic chain tensioner (35). The connecting cylinder (31) is mounted on the side of the permanent magnet motor (1) away from the reduction assembly (2). The mounting base (32) is disposed on the connecting cylinder (31). One end of the mounting base (32) is hinged to the connecting cylinder (31), and the other end is provided with a telescopic member (34) connected to the connecting cylinder (31). The fixed end of the telescopic member (34) is hinged to the connecting cylinder (31), and the movable end of the telescopic member (34) is rotatably disposed on the end of the mounting base (32) away from the connecting cylinder (31). The hydraulic chain tensioner (35) is mounted on the mounting base. On (32), one end of the hydraulic chain tensioner (35) is driven and connected to an action gear (36). The action gear (36) is located inside the mounting base (32). The mounting base (32) and the connecting cylinder (31) are connected. The idler wheel (33) is installed in the space formed by the connection between the mounting base (32) and the connecting cylinder (31). The action gear (36) meshes with the idler wheel (33) for transmission. The end of the rotating shaft (17) is fitted with a large gear (18). The large gear (18) is located inside the connecting cylinder (31). By driving the telescopic member (34), the mounting base (32) is rotatably mounted on the connecting cylinder (31) so that the idler wheel (33) meshes with or disengages from the large gear (18).

2. The semi-direct drive permanent magnet drive device according to claim 1, characterized in that: The connecting cylinder (31) includes a cover (311) and a base plate (312). The base plate (312) is disposed on the cover (311) and is connected to the cover (311). The mounting base (32) is mounted on the base plate (312). The cover (311) is mounted on one side of the permanent magnet motor (1). The large gear (18) is located inside the cover (311). A protective cover (313) is installed on the side of the cover (311) away from the permanent magnet motor (1).

3. The semi-direct drive permanent magnet drive device according to claim 2, characterized in that: The cover (311) is provided with a first connecting window (3111), the base plate (312) is provided with a second connecting window (3121), the mounting base (32) is hollow, and the mounting base (32) is provided with a third connecting window (326) on the side near the base plate (312). The first connecting window (3111), the second connecting window (3121) and the third connecting window (326) are connected in sequence to be engaged or disengaged by the idler wheel (33) and the large gear (18).

4. The semi-direct drive permanent magnet drive device according to claim 2, characterized in that: The substrate (312) is provided with a first hinge shaft (314), a first support (315) and a second support (316) at one end. The first support (315) is installed on one side of the substrate (312) and the second support (316) is installed on the other side of the substrate (312). One end of the first hinge shaft (314) is provided on the first support (315) and the other end is provided on the second support (316). One end of the mounting base (32) is sleeved on the first hinge shaft (314) so ​​that the mounting base (32) rotates about the first hinge shaft (314) as the rotation axis.

5. The semi-direct drive permanent magnet drive device according to claim 2, characterized in that: A third support (321) is provided at the other end of the substrate (312). A second hinge shaft (322) is installed on the third support (321). The fixed end of the telescopic member (34) is sleeved on the second hinge shaft (322). A fourth support (323) is installed on the mounting base (32). A third hinge shaft (324) is provided on the fourth support (323). A collar (325) is connected to the movable end of the telescopic member (34). The collar (325) is sleeved on and rotates on the third hinge shaft (324).

6. The semi-direct drive permanent magnet drive device according to claim 1, characterized in that: A support plate (37) is installed inside the connecting cylinder (31), and a proximity switch (371) is provided on the support plate (37). The proximity switch (371) and the meshing position of the large gear (18) and the idler wheel (33) are in the same horizontal direction.

7. The semi-direct drive permanent magnet drive device according to claim 1, characterized in that: The permanent magnet motor (1) also includes a housing (11), a rotor (12) and a stator (13). The rotor (12) is coaxial with the rotating shaft (17) and is sleeved on the rotating shaft (17). The stator (13) is coaxial with the rotating shaft (17) and is sleeved on the rotor (12).

8. The semi-direct drive permanent magnet drive device according to claim 7, characterized in that: The housing (11) is provided with a cooling pipe (14) on the side near the stator (13). One end of the cooling pipe (14) is connected to an oil inlet pipe (15), and the other end is connected to an oil outlet pipe (16).

9. A scraper conveyor for coal mines, characterized in that: Includes the semi-direct drive permanent magnet drive device as described in any one of claims 1-8.

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