A protective device for coal mine conveyor belts with tension buffering function

Abstract

This invention discloses a protective device for a coal mine conveyor belt with tension buffering function, relating to the field of coal mine transportation technology. The protective device for a coal mine conveyor belt with tension buffering function includes a frame, on which symmetrically distributed power rollers are mounted. The power of each of the symmetrically distributed power rollers is provided by the output shaft of a motor. A conveyor belt is wound around the symmetrically distributed power rollers. The frame is equipped with uniformly distributed first idler rollers, and uniformly distributed second idler rollers are rotatably connected to the frame. A first fixed plate is fixedly connected to the frame, and a control frame is slidably connected to the first fixed plate. A tension spring is installed between the control frame and the first fixed plate, and a tension roller is rotatably connected to the control frame. This invention changes the tension state of the conveyor belt by cooperating with the control frame and the tension roller, increasing the buffer distance of the conveyor belt and preventing breakage due to excessive tension accumulation, thus ensuring the safety of the device during emergency stops.

Description

Technical Field

[0001] This invention relates to the field of coal mine transportation technology, and in particular to a protective device for coal mine conveyor belts with tension buffering function. Background Technology

[0002] Coal mine conveyor belts, also known as coal mine belt conveyors, are mechanical devices used to transport coal from the mining site to processing equipment or storage areas. The operation of coal mine conveyor belts is based on a transmission device, usually driven by an electric motor.

[0003] If a power outage occurs suddenly while the coal mine conveyor belt is in operation, the conveyor belt will brake and stop abruptly. When the conveyor belt stops suddenly, the coal on the conveyor belt will continue to move forward due to inertia. The conveyor belt may be subjected to tension beyond normal working conditions, causing the conveyor belt to break or be damaged. If the conveyor belt breaks while working in an inclined coal mine roadway, the coal and the broken conveyor belt will roll downwards due to gravity, posing a great threat to the personal safety of the workers in the coal mine.

[0004] Therefore, there is an urgent need to develop a protective device for coal mine conveyor belts with tension buffering function to prevent rollover. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a protective device for coal mine conveyor belts with tension buffering function to prevent rollover.

[0006] The technical solution of this invention is as follows: A protective device for a coal mine conveyor belt with tension buffering function, comprising a frame, on which symmetrically distributed power rollers are arranged, the power of which is provided by the output shaft of a motor, the symmetrically distributed power rollers are wound around a conveyor belt, the frame is provided with uniformly distributed first idler rollers, the frame is rotatably connected to uniformly distributed second idler rollers, the frame is fixedly connected to a first fixed plate, the first fixed plate is slidably connected to a control frame, a tension spring is arranged between the control frame and the first fixed plate, the control frame is rotatably connected to a tension roller, and the first idler roller, the second idler roller and the tension roller are all connected to the conveyor belt. The frame is fixedly connected to a second fixed plate, and a control cylinder is fixedly connected to the second fixed plate. The control cylinder is equipped with symmetrically distributed electromagnets. The second fixed plate is slidably connected to a first limiting frame, and a tension spring is provided between the second fixed plate and the first limiting frame. The control cylinder is slidably connected to a first sliding plate equipped with a magnet. The first sliding plate is fixedly connected to a first limiting block, and the first limiting block is slidably connected to the second fixed plate. The first limiting frame and the first limiting block are in a limiting engagement. The control frame is equipped with a reset component, the first fixed plate is equipped with an anti-fall component, the frame is equipped with a tensioning and fixing mechanism, and the frame is equipped with an anti-deviation mechanism.

[0007] Furthermore, under normal operating conditions, the upper electromagnet is attracted to the magnet on the first sliding plate, while the lower electromagnet is repelled by the magnet on the first sliding plate.

[0008] Furthermore, the reset assembly includes a first fixed frame, which is fixedly connected to the control frame. The frame is fixedly connected to a first electric push rod via a mounting plate. The telescopic end of the first electric push rod is fixedly connected to the control plate. Both the frame and the first fixed frame are slidably connected to the control plate.

[0009] Furthermore, the fall arrestor includes a second electric push rod, which is fixed to the first fixed plate via a mounting plate. The telescopic end of the second electric push rod is fixed to a symmetrically distributed second limiting frame via a mounting bracket. The symmetrically distributed second limiting frames are all slidably connected to the first fixed plate. The control frame is slidably connected to a symmetrically distributed second limiting block, which engages with the adjacent second limiting frame. A spring is provided between the second limiting block and the control frame.

[0010] Furthermore, the spring constant between the control frame and the first fixed plate is greater than the spring constant between the second limit block and the control frame.

[0011] Furthermore, the tensioning and fixing mechanism includes a second fixed frame, which is fixedly connected to the frame. The second fixed frame is slidably connected to symmetrically distributed first racks. The first fixed frame is fixedly connected to a third fixed frame. The first rack near the first fixed frame is fixedly connected to the third fixed frame. The second fixed frame is rotatably connected to a first gear. The symmetrically distributed first racks all mesh with the first gear. The first rack away from the first fixed frame is fixedly connected to a sliding frame. The sliding frame is rotatably connected to a squeezing roller. The squeezing roller contacts and engages with the conveyor belt. The frame is equipped with fixing components.

[0012] Furthermore, the fixed assembly includes an energy storage device, which is fixedly connected to the frame. The frame is fixedly connected to a third electric push rod via a mounting plate. The energy storage device is electrically connected to the third electric push rod. The telescopic end of the third electric push rod is fixedly connected to a limit shell, and the frame is slidably connected to the limit shell.

[0013] Furthermore, the movement path of the limiting shell covers the second idler roller near the third electric push rod.

[0014] Furthermore, the anti-deviation mechanism includes two symmetrically distributed sets of second sliding plates, which are slidably connected to both sides of the frame. Each second sliding plate is equipped with a rack, and an anti-deviation rod is slidably connected to it. A spring is provided between the anti-deviation rod and the adjacent second sliding plate. The frame is rotatably connected to symmetrically distributed rotating rods via a mounting plate. Each set of second sliding plates is symmetrical about the axis of the adjacent rotating rod. A second gear is fixedly connected to the rotating rod, and the second gear meshes with the rack of the adjacent second sliding plate. A third gear is fixedly connected to the rotating rod. A first rack away from the first fixed frame is fixedly connected to a third fixed plate. The frame is equipped with symmetrically distributed second racks. The second rack closer to the first rack is fixedly connected to the third fixed plate. A fourth fixed plate is fixedly connected to the third fixed plate. The second rack away from the first rack is fixedly connected to the fourth fixed plate. The second rack meshes with the adjacent third gear.

[0015] Furthermore, the anti-deviation rod has a groove in the middle, and the side of the anti-deviation rod closest to the conveyor belt is inclined from the top and bottom to the middle groove, and the groove in the middle of the anti-deviation rod is equal in thickness to the conveyor belt.

[0016] The beneficial effects of this invention are as follows: This invention changes the tension of the conveyor belt by cooperating with the control frame and the tension roller, increasing the buffer distance of the conveyor belt and preventing breakage accidents caused by excessive tension accumulation. This ensures the safety of the device during emergency stops. The tension spring between the first fixed plate and the control frame, in cooperation with the power roller, buffers the kinetic energy of the conveyor belt, causing the resistance of the conveyor belt to gradually change from small to large during initial deceleration, ensuring the stability of the conveyor belt during deceleration. The control frame is limited by the cooperation of the second limit frame and the second limit block, preventing the tension roller and conveyor belt from resetting after the conveyor belt stops, thus avoiding the danger of the coal mine falling and ensuring the personal safety of personnel in the coal mine. The conveyor belt is released and contracted by the cooperation of the squeeze roller and the limit shell, reducing the tension on the conveyor belt during braking and ensuring that the conveyor belt is not damaged due to excessive tension. The conveyor belt is positioned and clamped by the cooperation of the second sliding plate and the anti-deviation rod, preventing the conveyor belt from deviating during the buffering process and ensuring the stability of the device during the buffering process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural cross-sectional view showing the positional relationship between the first fixing plate and the control frame of the present invention;

[0019] Figure 3 This is a three-dimensional structural cross-sectional view of the reset component of the present invention;

[0020] Figure 4This is a three-dimensional structural cross-sectional view of the positional relationship between the control cylinder and the first sliding plate of the present invention.

[0021] Figure 5 This is a three-dimensional structural cross-sectional view of the fall protection component of the present invention;

[0022] Figure 6 This is a three-dimensional structural cross-sectional view of the positional relationship between the second limiting frame and the second limiting block of the present invention;

[0023] Figure 7 This is a three-dimensional structural diagram of the tensioning and fixing mechanism of the present invention;

[0024] Figure 8 This is a three-dimensional structural cross-sectional view showing the positional relationship between the second fixing frame and the first gear of the present invention;

[0025] Figure 9 This is a three-dimensional structural cross-sectional view showing the positional relationship between the first rack and the third fixing plate of the present invention;

[0026] Figure 10 This is a three-dimensional structural cross-sectional view of the anti-deviation mechanism of the present invention;

[0027] Figure 11 This is a three-dimensional structural cross-sectional view showing the positional relationship between the second rack and the fourth fixing plate of the present invention.

[0028] Reference numerals: 1. Frame; 2. Power roller; 3. Conveyor belt; 4. First idler roller; 5. Second idler roller; 7. First fixed plate; 8. Control frame; 9. Tension roller; 10. Second fixed plate; 11. Control cylinder; 12. Electromagnet; 13. First limit frame; 14. First sliding plate; 15. First limit block; 1601. First fixed frame; 1602. First electric push rod; 1603. Control plate; 1701. Second electric push rod; 1702. Second limit frame; 1703. Second limit block. 1801. Second fixed frame; 1802. First rack; 1803. Third fixed frame; 1804. First gear; 1805. Sliding frame; 1806. Extrusion roller; 1807. Energy storage device; 1808. Third electric push rod; 1809. Limiting shell; 1901. Second sliding plate; 1902. Anti-deviation rod; 1903. Rotating rod; 1904. Second gear; 1905. Third gear; 1906. Third fixed plate; 1907. Second rack; 1908. Fourth fixed plate. Detailed Implementation

[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] Example 1: A protective device for coal mine conveyor belts with tension buffering function, such as... Figures 1-4 As shown, the device includes a frame 1 with two symmetrically distributed power rollers 2, both powered by motor output shafts. A conveyor belt 3 for carrying coal is wound around the two power rollers 2. A first idler roller 4 is evenly distributed on the upper side of the frame 1, and a second idler roller 5 is rotatably connected to the inner side of the frame 1. A first fixing plate 7 is fixedly connected to the inner side of the frame 1, and a control frame 8 for controlling the tension of the conveyor belt 3 is slidably connected to the first fixing plate 7. A tension spring is provided between the control frame 8 and the first fixing plate 7. To buffer the kinetic energy of the conveyor belt 3 and the coal mine, the control frame 8 is rotatably connected to a tension roller 9. The first idler roller 4, the second idler roller 5, and the tension roller 9 all contact and press against the conveyor belt 3. A second fixed plate 10 is fixedly connected to the inner side of the frame 1. A control cylinder 11 for adjusting the limiting state of the control frame 8 is fixedly connected to the second fixed plate 10. The control cylinder 11 is equipped with two symmetrically distributed electromagnets 12, and the magnetic poles of the two electromagnets 12 face the same direction. A first limiting frame 13 is slidably connected to the second fixed plate 10. The second fixed plate 10 and the first limiting frame 13... A tension spring is provided between the second fixed plate 10 and the first limiting frame 13. The tension spring between them is in a stretched state, used to release the limitation on the control frame 8. A first sliding plate 14 is slidably connected to the inner side of the control cylinder 11. The first sliding plate 14 is equipped with a magnet. When the electromagnet 12 is working normally, the magnet between the upper electromagnet 12 and the first sliding plate 14 is attracted, while the magnet between the lower electromagnet 12 and the first sliding plate 14 is repelled. Furthermore, the tension of the tension spring between the second fixed plate 10 and the first limiting frame 13 is less than that of the upper electromagnet 12. The attraction between magnet 12 and first sliding plate 1; a first limiting block 15 is fixedly connected to the rear side of first sliding plate 14; first limiting block 15 is slidably connected to second fixed plate 10; first limiting frame 13 is limited and cooperates with first limiting block 15; control frame 8 is provided with a reset component for driving it to reset; first fixed plate 7 is provided with a fall prevention component for preventing coal mine from falling downwards; frame 1 is provided with a tensioning and fixing mechanism for preventing conveyor belt 3 from piling up; frame 1 is provided with an anti-deviation mechanism for preventing conveyor belt 3 from deviating during buffering.

[0031] When this device is used to transport coal in an inclined coal mine roadway, the user drives two power rollers 2 to rotate through the output shaft of the motor. The power rollers 2 drive the conveyor belt 3 to move. The conveyor belt 3 moves back and forth guided by the first idler roller 4 and the second idler roller 5. At the same time, the coal is placed on the conveyor belt 3 and transported to the upper left. After the transportation is completed, the user controls the motor to gradually reduce the speed of the power rollers 2 and the conveyor belt 3 until they stop.

[0032] In the event of a sudden power outage during operation, causing the power roller 2 and conveyor belt 3 to brake abruptly, the two electromagnets 12 inside the control cylinder 11 will simultaneously lose their magnetic force. The tension spring between the first limiting frame 13 and the second fixed plate 10 will cause the first limiting frame 13 to move to the upper left and squeeze the first sliding plate 14 and the first limiting block 15 to move to the lower left until the first sliding plate 14 contacts and squeezes the electromagnet 12 on the lower left. At this point, the first limiting frame 13 loses its limiting effect on the control frame 8, causing the conveyor belt 3 to change from a tensioned state to a relaxed state. At this time, the coal on the conveyor belt 3 will move to the upper left due to inertia. The conveyor belt 3 will then drive the control frame 8 to move to the upper right through the tension roller 9, stretching the tension spring between the first fixed plate 7 and the control frame 8. By cooperating with the tension roller 9, the control frame 8 changes the tension of the conveyor belt 3, increasing the buffer distance of the conveyor belt 3 and preventing the conveyor belt 3 from breaking due to excessive tension accumulation, thus ensuring the safety of the device during emergency stops.

[0033] As the conveyor belt 3 moves to the upper right by the tension roller 9, the tension spring between the power roller 2 on the lower right side and the first fixed plate 7 and the control frame 8 continuously buffers the kinetic energy of the conveyor belt 3. The initial kinetic energy of the conveyor belt 3 driven by the coal mine is relatively large, and the resistance of the tension spring between the first fixed plate 7 and the control frame 8 to the conveyor belt 3 is initially small. As the conveyor belt 3 continues to move, the resistance of the tension spring between the first fixed plate 7 and the control frame 8 to the conveyor belt 3 increases until the conveyor belt 3 is braked. By using the tension spring between the first fixed plate 7 and the control frame 8 and the power roller 2 to buffer the kinetic energy of the conveyor belt 3, the resistance of the conveyor belt 3 during initial deceleration gradually changes from small to large, ensuring the stability of the conveyor belt 3 during deceleration.

[0034] As the control frame 8 moves to the upper right, the anti-fall component will always synchronously limit the position of the control frame 8 to prevent the tension roller 9 and the conveyor belt 3 from resetting after the conveyor belt 3 stops, which would cause the coal mine to fall and become dangerous.

[0035] As the control frame 8 moves to the upper right, it will simultaneously trigger the tensioning and fixing mechanism and the anti-deviation mechanism to prevent the conveyor belt 3 from piling up on the upper left side, while ensuring that the conveyor belt 3 does not deviate during this process.

[0036] Once power is restored, the user can use the reset component to reset the device. After the reset is complete, the device can be used again for coal mine transportation.

[0037] Example 2: Based on Example 1, such as Figure 3 and Figure 4 As shown, the reset assembly includes a first fixed frame 1601, which is fixed to the upper left side of the control frame 8. The frame 1 is fixed to a first electric push rod 1602 via a mounting plate to provide reset power. The telescopic end of the first electric push rod 1602 is fixed to a control plate 1603. Both the frame 1 and the first fixed frame 1601 are slidably connected to the control plate 1603.

[0038] like Figure 5 and Figure 6 As shown, the fall arrestor includes a second electric push rod 1701, which is fixed to the upper right side of the first fixed plate 7 via a mounting plate. The telescopic end of the second electric push rod 1701 is fixed to two symmetrically distributed second limit frames 1702 via a mounting bracket. Both second limit frames 1702 are slidably connected to the first fixed plate 7. The control frame 8 is slidably connected to two symmetrically distributed second limit blocks 1703. The second limit blocks 1703 cooperate with the adjacent second limit frames 1702 to limit the control frame 8. A spring is provided between the second limit blocks 1703 and the control frame 8 to ensure the limited state of the second limit blocks 1703 and the adjacent second limit frames 1702. The elastic coefficient of the tension spring between the control frame 8 and the first fixed plate 7 is greater than the elastic coefficient of the spring between the second limit blocks 1703 and the control frame 8.

[0039] like Figure 7 and Figure 8 As shown, the tensioning and fixing mechanism includes a second fixing frame 1801, which is fixed to the inner side of the frame 1. The second fixing frame 1801 is slidably connected to two symmetrically distributed first racks 1802. A third fixing frame 1803 is fixed to the lower left side of the first fixing frame 1801, and the first rack 1802 on the lower right side is fixed to the third fixing frame 1803. A first gear 1804 is rotatably connected to the second fixing frame 1801, and both first racks 1802 mesh with the first gear 1804. A sliding frame 1805 is fixed to the upper side of the first rack 1802 on the upper left side. A squeezing roller 1806 that contacts and engages with the conveyor belt 3 is rotatably connected to the sliding frame 1805. The frame 1 is provided with a fixing component for fixing the conveyor belt 3.

[0040] like Figure 7 and Figure 8As shown, the fixed assembly includes an energy storage device 1807, which is fixedly connected to the frame 1. The energy storage device 1807 is an independent emergency power supply. A third electric push rod 1808 is fixedly connected to the front side of the frame 1 via a mounting plate. The energy storage device 1807 is electrically connected to the third electric push rod 1808 to provide energy to the third electric push rod 1808. The telescopic end of the third electric push rod 1808 is fixedly connected to a limiting shell 1809. The movement path of the limiting shell 1809 covers the second idler roller 5 of the third electric push rod 1808 to fasten the conveyor belt 3. The frame 1 is slidably connected to the limiting shell 1809.

[0041] like Figure 1 and Figures 9-11 As shown, the anti-deviation mechanism includes two sets of second sliding plates 1901 symmetrically distributed on the left and right sides. The two sets of second sliding plates 1901 are slidably connected to the front and rear sides of the frame 1, respectively. Each second sliding plate 1901 is equipped with a rack. An anti-deviation rod 1902 for correcting the movement angle of the conveyor belt 3 is slidably connected to the upper right side of the second sliding plate 1901. The anti-deviation rod 1902 has a groove in the middle. The side of the anti-deviation rod 1902 closest to the conveyor belt 3 is inclined from the upper and lower sides towards the middle groove. The groove in the middle of the anti-deviation rod 1902 is equal in thickness to the conveyor belt 3. A spring is provided between the anti-deviation rod 1902 and the second sliding plate 1901 to maintain the correction of the conveyor belt 3 by the anti-deviation rod 1902. The frame 1 is rotatably connected to two symmetrically distributed rotating plates via a mounting plate. The rotating rod 1903 and each set of second sliding plates 1901 are symmetrical about the axis of the adjacent rotating rod 1903. The rotating rod 1903 is fixedly connected to the second gear 1904, which meshes with the rack of the adjacent second sliding plate 1901. The rotating rod 1903 is fixedly connected to the third gear 1905. The first rack 1802 on the upper left side is fixedly connected to the third fixed plate 1906. The frame 1 is provided with symmetrically distributed second racks 1907. The second rack 1907 on the upper left side is fixedly connected to the third fixed plate 1906. The front side of the third fixed plate 1906 is fixedly connected to the fourth fixed plate 1908. The second rack 1907 on the lower right side is fixedly connected to the fourth fixed plate 1908. The second rack 1907 meshes with the adjacent third gear 1905.

[0042] As the control frame 8 moves to the upper right, it drives the two second limit blocks 1703 to move synchronously to the upper right. The inclined surface of the second limit block 1703 contacts the inclined surface of the second limit frame 1702. As the second limit block 1703 moves upward, the second limit frame 1702 compresses the second limit block 1703 and moves it to the upper left. The spring between the second limit block 1703 and the control frame 8 is compressed until the inclined surface of the second limit block 1703 loses contact with the inclined surface of the current second limit frame 1702. The spring between the control frame 8 resets and moves the second limit block 1703 to the lower right, thus limiting the control frame 8. After the kinetic energy of the conveyor belt 3 and the coal mine is buffered, the second limit frame 1702 and the second limit block 1703 always limit the control frame 8. By cooperating with the second limit frame 1702 and the second limit block 1703 to limit the control frame 8, it prevents the tension roller 9 and the conveyor belt 3 from resetting after the first fixed plate 7 and the control frame 8 stop, thus preventing the coal mine from falling and causing danger, and ensuring the personal safety of the personnel in the coal mine.

[0043] Before the control frame 8 moves to the upper right, the user first activates the third electric push rod 1808 through the energy storage device 1807. The user controls the extension end of the third electric push rod 1808 to retract, and the extension end of the third electric push rod 1808 drives the limiting shell 1809 to move downward until the limiting shell 1809 squeezes the conveyor belt 3 against the second idler roller 5 on the lower left side of the limiting shell 1809. The limiting shell 1809 and the adjacent second idler roller 5 cooperate to squeeze and fix the conveyor belt 3. Then, when the control frame 8 moves to the upper right, the control frame 8 drives the first rack 1802 on the lower right side to move to the upper right side through the first fixed frame 1601 and the third fixed frame 1803. 802 meshes with the first gear 1804 and drives the first rack 1802 on the upper left side to move to the lower left side. The first rack 1802 on the upper left side drives the squeezing roller 1806 to move to the lower left side through the sliding frame 1805. The squeezing roller 1806 squeezes and drives the conveyor belt 3 to move to the lower left side. The distance that the squeezing roller 1806 moves downward is equal to the distance that the tensioning roller 9 moves upward. Therefore, the conveyor belt 3 released by the tensioning roller 9 will not cause the conveyor belt 3 to accumulate at the upper left end. Through the cooperation of the squeezing roller 1806 and the limiting shell 1809, the conveyor belt 3 is released and contracted, which reduces the tension on the conveyor belt 3 when braking and ensures that the conveyor belt 3 will not be damaged due to excessive tension.

[0044] When the first rack 1802 on the upper left side moves to the lower left side, it drives the two second racks 1907 to move synchronously to the lower left side through the third fixed plate 1906 and the fourth fixed plate 1908. The two second racks 1907 mesh with the adjacent third gears 1905 respectively. Taking the upper left side as an example, the meshing of the second racks 1907 with the third gears 1905 drives the rotating rod 1903 to rotate. The rotating rod 1903 drives the second gear 1904 to rotate. The second gear 1904 meshes with the racks of the two second sliding plates 1901. The spring between the second sliding plate 1901 and the anti-deviation rod 1902 drives the two anti-deviation rods 1902 to move synchronously towards the middle. After the anti-deviation rod 1902 contacts the conveyor belt 3, it continues to move until the conveyor belt 3 enters the groove in the middle of the anti-deviation rod 1902. At this time, the conveyor belt 3 is positioned to prevent it from deviating due to loosening. The second sliding plate 1901 and the anti-deviation rod 1902 cooperate to position and clamp the conveyor belt 3, preventing it from deviating during the buffering process and ensuring the stability of the device during the buffering process.

[0045] When power is restored and the conveyor belt 3 needs to be reset, the user first controls the extension end of the third electric push rod 1808 via the energy storage device 1807. The extension end of the third electric push rod 1808 drives the limiting shell 1809 to move upward and lose its limiting effect on the conveyor belt 3. Subsequently, the user controls the extension end of the second electric push rod 1701 to extend. The extension end of the second electric push rod 1701 drives the two second limiting frames 1702 to move to the lower right side via the mounting bracket until both second limiting frames 1702 lose their limiting effect on the two second limiting blocks 1703. The frame 8 is driven to move to the lower left by the tension spring between the first fixed plate 7 and the control frame 8. The control frame 8 moves to the lower left and drives the extrusion roller 1806 to move to the upper right and reset through the first rack 1802, the third fixed frame 1803, the first gear 1804 and the sliding frame 1805. The first rack 1802 on the upper left side is simultaneously driven to reset the anti-deviation rod 1902 through the third fixed plate 1906, the fourth fixed plate 1908, the second rack 1907, the third gear 1905, the rotating rod 1903, the second gear 1904 and the second sliding plate 1901.

[0046] However, due to frictional resistance, the conveyor belt 3 has not yet returned to its initial tension state. The user then controls the extension end of the first electric push rod 1602 to extend. The extension end of the first electric push rod 1602 drives the control plate 1603 to move to the lower left. The control plate 1603 moves to the end of the slide groove of the first fixed frame 1601. The control plate 1603 drives the first fixed frame 1601 to continue moving to the lower left until the control frame 8 returns to the initial tension state of the conveyor belt 3. Then, the user simultaneously activates both electromagnets 12. The electromagnet 12 on the lower left passes through... The electromagnet 12 on the upper right side uses a repulsive force to drive the first sliding plate 14 and the first limiting block 15 to reset through attraction, and also presses the first limiting frame 13 to reset. At this time, the first limiting frame 13 forms a limit on the control frame 8. The user controls the extension end of the second electric push rod 1701 to retract. The extension end of the second electric push rod 1701 drives the two second limiting frames 1702 to reset through the mounting frame. At this time, the second limiting frame 1702 cooperates with the second limiting block 1703 again to limit the control frame 8. The reset is then completed, and the user continues to transport coal.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A protective device for a coal mine conveyor belt with tension buffering function, characterized in that: The system includes a frame (1), on which symmetrically distributed power rollers (2) are provided. The power of the symmetrically distributed power rollers (2) is provided by the output shaft of a motor. The symmetrically distributed power rollers (2) are wound around a conveyor belt (3). The frame (1) is provided with uniformly distributed first idler rollers (4). The frame (1) is rotatably connected to uniformly distributed second idler rollers (5). The frame (1) is fixedly connected to a first fixed plate (7). The first fixed plate (7) is slidably connected to a control frame (8). A tension spring is provided between the control frame (8) and the first fixed plate (7). The control frame (8) is rotatably connected to a tension roller (9). The first idler roller (4), the second idler roller (5), and the tension roller (9) are all in contact with the conveyor belt (3). The frame (1) is fixedly connected to a second fixed plate (10). The second fixed plate (10) is fixedly connected to a device for adjusting... The control cylinder (11) of the control frame (8) in the limit state is provided with symmetrically distributed electromagnets (12), the second fixed plate (10) is slidably connected to the first limit frame (13), a tension spring is provided between the second fixed plate (10) and the first limit frame (13), the control cylinder (11) is slidably connected to the first sliding plate (14), a magnet is provided on the first sliding plate (14), the first sliding plate (14) is fixedly connected to the first limit block (15), the first limit block (15) is slidably connected to the second fixed plate (10), the first limit frame (13) and the first limit block (15) are limited and cooperated, the control frame (8) is provided with a reset component, the first fixed plate (7) is provided with a fall prevention component, the frame (1) is provided with a tensioning and fixing mechanism, and the frame (1) is provided with an anti-deviation mechanism; The reset assembly includes a first fixed frame (1601), which is fixed to the control frame (8). The frame (1) is fixed to a first electric push rod (1602) via a mounting plate. The telescopic end of the first electric push rod (1602) is fixed to a control plate (1603). The frame (1) and the first fixed frame (1601) are slidably connected to the control plate (1603). The telescopic end of the first electric push rod (1602) extends out and drives the control plate (1603) to move. The control plate (1603) moves to the end of the slide groove of the first fixed frame (1601). The fall arrestor includes a second electric push rod (1701), which is fixed to the first fixed plate (7) by a mounting plate. The telescopic end of the second electric push rod (1701) is fixed to a symmetrically distributed second limit frame (1702) by a mounting bracket. The symmetrically distributed second limit frames (1702) are all slidably connected to the first fixed plate (7). The control frame (8) is slidably connected to a symmetrically distributed second limit block (1703). The second limit block (1703) is limited to the adjacent second limit frame (1702). A spring is provided between the second limit block (1703) and the control frame (8). The tensioning and fixing mechanism includes a second fixed frame (1801), which is fixed to the frame (1). The second fixed frame (1801) is slidably connected to a symmetrically distributed first rack (1802). The first fixed frame (1601) is fixedly connected to a third fixed frame (1803). The first rack (1802) near the first fixed frame (1601) is fixedly connected to the third fixed frame (1803). The second fixed frame (1801) is rotatably connected to a first gear (1804). The symmetrically distributed first racks (1802) all mesh with the first gear (1804). The first rack (1802) away from the first fixed frame (1601) is fixedly connected to a sliding frame (1805). The sliding frame (1805) is rotatably connected to a squeezing roller (1806). The squeezing roller (1806) is in contact with the conveyor belt (3). The frame (1) is provided with a fixing component.

2. The protective device with tension buffering function for a coal mine conveyor belt as described in claim 1, characterized in that: When the electromagnet (12) is working normally, the upper electromagnet (12) and the magnet on the first sliding plate (14) are attracted to each other, while the lower electromagnet (12) and the magnet on the first sliding plate (14) are repelled.

3. A protective device with tension buffering function for a coal mine conveyor belt as described in claim 2, characterized in that: The spring force coefficient between the control frame (8) and the first fixed plate (7) is greater than the spring force coefficient between the second limit block (1703) and the control frame (8).

4. A protective device with tension buffering function for a coal mine conveyor belt as described in claim 3, characterized in that: The fixed assembly includes an energy storage device (1807), which is fixed to the frame (1). The frame (1) is fixed to a third electric push rod (1808) via a mounting plate. The energy storage device (1807) is electrically connected to the third electric push rod (1808). The telescopic end of the third electric push rod (1808) is fixed to a limiting shell (1809). The frame (1) is slidably connected to the limiting shell (1809).

5. A protective device with tension buffering function for a coal mine conveyor belt as described in claim 4, characterized in that: The movement path of the limiting shell (1809) covers the second idler (5) near the third electric push rod (1808).

6. A protective device for a coal mine conveyor belt with tension buffering function as described in claim 5, characterized in that: The anti-deviation mechanism includes two symmetrically distributed sets of second sliding plates (1901), which are slidably connected to both sides of the frame (1). Each second sliding plate (1901) is equipped with a rack, and each second sliding plate (1901) is slidably connected to an anti-deviation rod (1902). A spring is provided between the anti-deviation rod (1902) and the adjacent second sliding plate (1901). The frame (1) is rotatably connected to symmetrically distributed rotating rods (1903) via a mounting plate. Each set of second sliding plates (1901) is symmetrical about the axis of the adjacent rotating rod (1903). A second gear (1904) is fixedly connected to each rotating rod (1903). The second gear (1904) is connected to the corresponding rotating rod. The rack adjacent to the second sliding plate (1901) meshes with the third gear (1905) fixedly connected to the rotating rod (1903). The first rack (1802) away from the first fixed frame (1601) is fixedly connected to the third fixed plate (1906). The frame (1) is provided with symmetrically distributed second racks (1907). The second rack (1907) close to the first rack (1802) is fixedly connected to the third fixed plate (1906). The third fixed plate (1906) is fixedly connected to the fourth fixed plate (1908). The second rack (1907) away from the first rack (1802) is fixedly connected to the fourth fixed plate (1908). The second rack (1907) meshes with the adjacent third gear (1905).

7. A protective device for a coal mine conveyor belt with tension buffering function as described in claim 6, characterized in that: The anti-deviation rod (1902) has a groove in the middle. The anti-deviation rod (1902) is inclined from the top and bottom sides toward the groove in the middle on the side close to the conveyor belt (3). The groove in the middle of the anti-deviation rod (1902) is equal to the thickness of the conveyor belt (3).

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