Double-gate four-bar feeding structure of roller mill

Abstract

The application discloses a kind of double-gate four-bar unloading structures of roll mill, including rack and the feed cylinder of being arranged in rack, feed cylinder is equipped with left dynamic unloading guide gate and right dynamic unloading guide gate together with rack hinged, left dynamic unloading guide gate is hinged together with the one end of left first connecting rod, the other end of left first connecting rod is hinged together with the one end of left second connecting rod and the one end of left telescopic rod, the other end of left second connecting rod and the other end of left telescopic rod are all hinged together with rack, dynamic unloading guide gate, left first connecting rod, the one end of left second connecting rod and rack are connected into a four-bar linkage structure, the same as left dynamic unloading guide gate, the driving connection mode of right dynamic unloading guide gate, dynamic feed opening is formed between left dynamic unloading guide gate and right dynamic unloading guide gate.The application aims to have the advantage of being able to adjust feed speed, solves the problem that the size of existing sand making machine feed opening cannot meet the need of feed speed adjustment.

Description

Technical Field

[0001] This invention relates to the field of roller sand making machine technology, and in particular to a double-gate four-bar feeding structure for a roller sand making machine. Background Technology

[0002] Roller sand making machines typically include fixed rollers and movable rollers. Material is fed in from above the two rollers, continuously drawn into the space between them by the compression rollers, and discharged from the bottom of the machine at an ideal particle size. The relative movement of the two rollers crushes stones into sand. Chinese patent document CN202021220681X, authorized and announced on April 13, 2021, entitled "A Double Roller Sand Making Machine," includes a frame, a first pressing roller, a second pressing roller, and a drive motor. A pressing channel is formed between the first and second pressing rollers. The first pressing roller is rotatably connected to the frame, and the drive motor is connected to the frame to drive the first pressing roller to rotate. The frame has several support legs, each including a base plate, a lifting plate, a top plate, and a column arranged sequentially from bottom to top. The base plate has a positioning ring. A shortcoming of existing roller sand making machines is that the size of the feed inlet remains constant, thus preventing adjustment of the feed speed as needed. Summary of the Invention

[0003] The present invention aims to provide a double-gate four-bar feeding structure for a roller mill with adjustable feeding speed, which solves the problem that the existing sand making machine cannot meet the need for feeding speed adjustment due to the fixed size of the feed inlet.

[0004] The above technical problems are solved by the following technical solution: a double-gate four-bar feeding structure for a roller mill, including a frame and a feed cylinder located above two grinding cylinders on the frame. The feed cylinder contains a left movable feeding guide gate hinged to the frame and a right movable feeding guide gate hinged to the frame. The left movable feeding guide gate is hinged to one end of a left first connecting rod, and the other end of the left first connecting rod is hinged to one end of a left second connecting rod and one end of a left telescopic rod. The other ends of the left second connecting rod and the left telescopic rod are both hinged to the frame. The left first link, the left second link, and one end of each link are connected to the frame to form a four-bar linkage. The right moving feed guide gate is hinged to one end of the right first link. The other end of the right first link is hinged to one end of the right second link and one end of the right telescopic rod. The other ends of the right second link and the right telescopic rod are both hinged to the frame. The left and right moving feed guide gates form a dynamic feed inlet. In use, the left and right moving feed guide gates are driven to swing by the left and right telescopic rods, thereby changing the opening and closing size of the dynamic feed inlet. This controls the feeding speed, prevents the roller mill from running dry without material, and avoids blockages in the feed cylinder. Without material, the feed cylinder is easily damaged when material is fed again, and this also prevents jamming when material is encountered. The existing feeds are all of constant size, which cannot solve the above problems.

[0005] Preferably, the feed cylinder is equipped with a right-feeding guide gate and a left-feeding guide gate. The right-feeding guide gate is located above the right-moving feeding guide gate, with its lower end lower than the lower end of the left-moving feeding guide gate and extending to the left beyond the right-feeding guide gate. The left-feeding guide gate is located above the left-moving feeding guide gate, with its lower end lower than the lower end of the left-moving feeding guide gate and extending to the right beyond the left-feeding guide gate. A static feed inlet is formed between the right-feeding guide gate and the left-feeding guide gate. This design reduces the effort required to drive the left and right-moving feeding guide gates to swing.

[0006] Preferably, the system further includes a left support plate fixed at its upper end to the feed cylinder and located below the left discharge guide gate, and a right support plate fixed at its upper end to the feed cylinder and located below the right discharge guide gate. The left discharge guide gate and the feed cylinder are movable relative to each other. A left guide rod is fixedly connected to the lower surface of the left discharge guide gate and passes through the left support plate. A left shock-absorbing spring for driving the left discharge guide gate to reset is sleeved on the left guide rod. A left sound-insulating sponge is provided between the left support plate and the left discharge guide gate. In its free state, the left sound-insulating sponge is connected to both the left feeding guide gate and the left support plate. The right feeding guide gate is movable relative to the feed cylinder. A right guide rod, passing through the right support plate, is fixed to the lower surface of the right feeding guide gate. A right damping spring, which drives the right feeding guide gate to reset, is sleeved on the right guide rod. A right sound-insulating sponge is provided between the right support plate and the right feeding guide gate. In its free state, the right sound-insulating sponge is connected to both the right feeding guide gate and the right support plate. This design reduces damage to the left and right feeding guide gates during feeding and reduces noise during feeding.

[0007] Preferably, the system also includes a water tank, a left-press nozzle, and a right-press nozzle. The inlet pipe of the left-press nozzle extends into the water tank. The left-press nozzle is fixed to the left guide rod. The upper end of the left support plate is provided with two left baffles distributed in the front-back direction. The left support plate and the two left baffles form a left water supply trough. The nozzle of the left-press nozzle is located in the left water supply trough. The inlet pipe of the right-press nozzle extends into the water tank. The right-press nozzle is fixed to the right guide rod. The upper end of the right support plate is provided with two right baffles distributed in the front-back direction. The right support plate and the two right baffles form a right water supply trough. The nozzle of the right-press nozzle is located in the right water supply trough. This system allows for simultaneous water spraying onto the stones entering the roller mill during feeding. The water is carried by the stones to the rollers, cooling them and preventing softening due to prolonged exposure. Softening leads to increased wear and shortens the rollers' lifespan. The water is also distributed through sound-absorbing foam, enhancing its sound insulation properties.

[0008] Preferably, the frame is hinged to the left movable feeding guide gate via a left first forward-backward hinge axis. The left movable feeding guide gate is hinged to the left first connecting rod via a left second forward-backward hinge axis. The left first connecting rod is hinged to the left second connecting rod and the left telescopic rod via a left third forward-backward hinge axis. The left second connecting rod is hinged to the frame via a left fourth forward-backward hinge axis. The left telescopic rod is hinged to the frame via a left fifth forward-backward hinge axis. The frame is also hinged to the right movable feeding guide gate via a right first forward-backward hinge axis. The right movable feeding guide gate is hinged to the right first connecting rod via a right second forward-backward hinge axis. The right first connecting rod is hinged to the right second connecting rod and the right telescopic rod via a right third forward-backward hinge axis. The right second connecting rod is hinged to the frame via a right fourth forward-backward hinge axis. The right telescopic rod is hinged to the frame via a right fifth forward-backward hinge axis. This design minimizes wobbling during the movable feeding guide gate's swing, improving the accuracy of feeding control.

[0009] Preferably, the telescopic rod is an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder; the right telescopic rod is an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder.

[0010] Preferably, the hinge point between the left first link and the left moving feeding guide gate is located above the hinge point between the left moving feeding guide gate and the frame, and the hinge point between the right first link and the right moving feeding guide gate is located above the hinge point between the right moving feeding guide gate and the frame. This design allows for a longer lever arm for the telescopic rod drive, thereby reducing the force required to open and close the moving feeding guide gate.

[0011] Preferably, the frame has a left longitudinal beam, with a right connecting lug on the right side and a left connecting lug on the left side. The left movable feed guide gate is hinged to the right connecting lug of the left longitudinal beam, and the left second connecting rod is hinged to the left connecting lug of the left longitudinal beam. The frame also has a right longitudinal beam, with a right connecting lug on the right side and a left connecting lug on the left side. The right movable feed guide gate is hinged to the left connecting lug of the right longitudinal beam, and the right second connecting rod is hinged to the right connecting lug of the right longitudinal beam. This design prevents damage to the connection between the movable feed guide gate and the frame.

[0012] Preferably, the left second link is a curved rod structure bending towards the left longitudinal beam, and the right second link is a curved rod structure bending towards the right longitudinal beam. This avoids interference between the longitudinal beam and the second link while maintaining a compact structure.

[0013] Preferably, the left longitudinal beam includes a left longitudinal flat tube, an upper left longitudinal strip fixed to the upper surface of the left longitudinal flat tube, and a lower left longitudinal strip fixed to the lower surface of the left longitudinal flat tube. The left connecting lug of the left longitudinal rod is simultaneously connected to the left longitudinal flat tube, the upper left longitudinal strip, and the lower left longitudinal strip. The right longitudinal beam includes a right longitudinal flat tube, an upper right longitudinal strip fixed to the upper surface of the right longitudinal flat tube, and a lower right longitudinal strip fixed to the lower surface of the right longitudinal flat tube. The right connecting lug of the right longitudinal rod is simultaneously connected to the right longitudinal flat tube, the upper right longitudinal strip, and the lower right longitudinal strip. The connecting lug can strengthen the longitudinal beam, thereby increasing its strength while reducing its weight.

[0014] The beneficial effect of this invention is that the size of the feed inlet can be adjusted, thereby changing the feeding speed by changing the size of the feed inlet. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention;

[0016] Figure 2 This is a partial schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of Embodiment 2 of the present invention;

[0018] Figure 4 for Figure 3 A magnified view of a portion of point A.

[0019] In the diagram: 1. Frame; 2. Feed cylinder; 3. Left longitudinal beam; 4. Right connecting lug of left longitudinal beam; 5. Left connecting lug of left longitudinal beam; 6. Left longitudinal flat tube; 7. Upper left longitudinal strip; 8. Lower left longitudinal strip; 9. Left first forward / backward hinge shaft; 10. Left moving discharge guide gate; 11. Left second forward / backward hinge shaft; 12. Left first connecting rod; 13. Left third forward / backward hinge shaft; 14. Left telescopic rod; 15. Left fourth forward / backward hinge shaft; 16. Left fifth forward / backward hinge shaft; 33. Left discharge guide gate; 17. Right longitudinal beam; 18. Right connecting lug of right longitudinal beam; 19. Left connecting lug of right longitudinal beam; 20. Right longitudinal flat tube; 21. Upper right longitudinal strip; 22. Lower right longitudinal strip; 23. Right first forward / backward hinge shaft; 24. Right moving discharge guide gate; 25. Right second forward / backward hinge shaft; 26. Right first connecting rod; 27. Right third forward / backward hinge shaft. 28. Hinge shaft, 29. Right second connecting rod, 30. Right telescopic rod, 31. Right fourth forward and backward hinge shaft, 32. Right unloading guide gate, 34. Right fifth forward and backward hinge shaft, 35. Static feed inlet, 36. Dynamic feed inlet, 37. Left support plate, 38. Left baffle plate, 39. Left guide rod, 40. Left shock-absorbing spring, 41. Left sound insulation sponge, 42. Water tank, 43. Left push-button nozzle, 44. Left water baffle, 45. Left water supply trough, 46. Nozzle of left push-button nozzle, 47. Water inlet pipe of left push-button nozzle, 48. Right support plate, 49. Right baffle plate, 50. Right guide rod, 51. Right shock-absorbing spring, 52. Right sound insulation sponge, 53. Right push-button nozzle, 54. Right water baffle, 55. Nozzle of right push-button nozzle, 56. Water inlet pipe of right push-button nozzle, 57. Compactor cylinder, 58. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1, see Figure 1 and Figure 2A double-gate four-bar feeding structure for a roller mill includes a frame 1 and a feed cylinder 2 located above two rolling cylinders 58 on the frame. The frame has a left longitudinal beam 3, with a right connecting lug 4 on the right side and a left connecting lug 5 on the left side. The left longitudinal beam includes a left longitudinal flat tube 6, an upper left longitudinal strip 7 fixed to the upper surface of the left longitudinal flat tube, and a lower left longitudinal strip 8 fixed to the lower surface of the left longitudinal flat tube. The left connecting lug of the left longitudinal bar is simultaneously connected to the left longitudinal flat tube, the upper left longitudinal strip, and the lower left longitudinal strip. The feed cylinder has a left movable feeding guide gate 10 hinged to the right connecting lug of the left longitudinal beam via a left first forward and backward hinge shaft 9. The left moving feed guide gate is hinged to the left first connecting rod 12 via the left second forward-backward hinge shaft 11. The left first connecting rod is hinged to the left second connecting rod 14 and the left telescopic rod 15 via the left third forward-backward hinge shaft 13. The left second connecting rod is hinged to the left connecting lug of the left longitudinal beam via the left fourth forward-backward hinge shaft 16. The left telescopic rod is hinged to the frame via the left fifth forward-backward hinge shaft 33. The moving feed guide gate, the left first connecting rod, and one end of the left second connecting rod are connected to the frame to form a four-bar linkage. The left telescopic rod is an electric cylinder, hydraulic cylinder, or pneumatic cylinder; in this embodiment, it is an electric cylinder. The hinge point between the left first connecting rod and the left moving feed guide gate is located above the hinge point between the left moving feed guide gate and the frame. The left second connecting rod is a curved rod structure that bends towards the left longitudinal beam. The left feed guide gate 17 is estimated to be inside the feed cylinder. The left discharge guide gate is located above the left moving discharge guide gate. The lower end of the left moving discharge guide gate is lower than the lower end of the left discharge guide gate, and the lower end of the left moving discharge guide gate extends to the right beyond the left discharge guide gate.

[0022] The frame is equipped with a right longitudinal beam 18. The right side of the right longitudinal beam has a right connecting lug 19, and the left side has a left connecting lug 20. The right longitudinal beam includes a right longitudinal flat tube 21, an upper right longitudinal strip 22 fixed to the upper surface of the right longitudinal flat tube, and a lower right longitudinal strip 23 fixed to the lower surface of the right longitudinal flat tube. The right connecting lug of the right longitudinal beam is simultaneously connected to the right longitudinal flat tube, the upper right longitudinal strip, and the lower right longitudinal strip. Inside the feed cylinder is a right movable discharge guide gate 25, hinged to the left connecting lug of the right longitudinal beam via a right first forward / backward hinge shaft 24. The right movable discharge guide gate is hinged to the right first connecting rod 27 via a right second forward / backward hinge shaft 26. The right first connecting rod is hinged to the right second connecting rod 29 and the right telescopic rod 30 via a right third forward / backward hinge shaft 28. The right second connecting rod is hinged to the right connecting lug of the right longitudinal beam via a right fourth forward / backward hinge shaft 31. The moving feed guide gate, the first right connecting rod, one end of the second right connecting rod, and the frame form a four-bar linkage. The right telescopic rod is an electric cylinder, hydraulic cylinder, or pneumatic cylinder. The hinge point between the first right connecting rod and the right moving feed guide gate is located above the hinge point between the right moving feed guide gate and the frame. The second right connecting rod is a curved rod structure that bends towards the right longitudinal beam. A right feed guide gate 32 is estimated to be located inside the feed cylinder. The right feed guide gate is located above the right moving feed guide gate, with its lower end lower than the lower end of the right moving feed guide gate, and its lower end extending to the left beyond the right feeding guide gate. The right telescopic rod and the fifth right forward / backward hinge shaft 34 are hinged together with the frame.

[0023] A static feed inlet 35 is formed between the right and left feed guide gates. A dynamic feed inlet 36 is formed between the left and right moving feed guide gates.

[0024] In use, the left and right telescopic rods drive the left and right moving guide gates to swing, thereby changing the opening and closing size of the dynamic feed port and controlling the feeding speed.

[0025] Example 2 differs from Example 1 in that:

[0026] See Figure 3 and Figure 4It also includes a left support plate 37 located below the left discharge guide gate, which is fixed together with the upper end of the feed cylinder. The left discharge guide gate and the feed cylinder can move relative to each other. The feed cylinder is fixedly and sealed with a left baffle plate 38 that blocks the gap between the upper end of the left discharge guide gate and the feed cylinder. A left guide rod 39 is fixedly connected to the lower surface of the left discharge guide gate and passes through the left support plate. A left shock-absorbing spring 40 is sleeved on the left guide rod to drive the left discharge guide gate to reset. A left sound insulation sponge 41 is provided between the left support plate and the left discharge guide gate. When the left discharge guide gate is in a free state, the left sound insulation sponge is connected to both the left discharge guide gate and the left support plate. It also includes a water storage tank 42 and a left press-type nozzle 43. The left-press spray head is fixed together with the left guide rod. The upper end of the left support plate is provided with two left baffle plates 44 distributed in the front-back direction. The left support plate and the two left baffle plates form a left water supply trough 45. The nozzle 46 of the left-press spray head is located in the left water supply trough. The water inlet pipe 47 of the left-press spray head extends into the water storage tank.

[0027] It also includes a right support plate 48 located below the right discharge guide gate, which is fixed together with the upper end of the feed cylinder. The right discharge guide gate and the feed cylinder are movable relative to each other. The feed cylinder is fixedly and sealed with a right baffle plate 49 that blocks the gap between the upper end of the right discharge guide gate and the feed cylinder. A right guide rod 50 is fixedly connected to the lower surface of the right discharge guide gate and passes through the right support plate. A right shock-absorbing spring 51 that drives the right discharge guide gate to reset is sleeved on the right guide rod. A right sound-insulating sponge 52 is provided between the right support plate and the right discharge guide gate. When the right discharge guide gate is in a free state, the right sound-insulating sponge is connected to both the right discharge guide gate and the right support plate. It also includes a right press-type nozzle 53. The right-press nozzle is fixed together with the right guide rod. The upper end of the right support plate is provided with two right baffles 54 distributed in the front-to-back direction. The right support plate and the two right baffles form a right water supply trough 55. The nozzle 56 of the right-press nozzle is located in the right water supply trough. The water inlet pipe 57 of the right-press nozzle extends into the water storage tank.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-gate four-bar feeding structure for a roller mill, comprising a frame and a feed cylinder disposed above two grinding cylinders on the frame, characterized in that, The feeding cylinder is provided with a left movable lower discharging guide flap hinged together with the frame and a right movable lower discharging guide flap hinged together with the frame, the left movable lower discharging guide flap is hinged together with one end of a left first connecting rod, the other end of the left first connecting rod is hinged together with one end of a left second connecting rod and one end of a left telescopic rod, the other end of the left second connecting rod and the other end of the left telescopic rod are both hinged together with the frame, the movable lower discharging guide flap, the left first connecting rod, one end of the left second connecting rod and the frame form a four-connecting-rod structure, the right movable lower discharging guide flap is hinged together with one end of a right first connecting rod, the other end of the right first connecting rod is hinged together with one end of a right second connecting rod and one end of a right telescopic rod, the other end of the right second connecting rod and the other end of the right telescopic rod are both hinged together with the frame, the movable lower discharging guide flap, the right first connecting rod, one end of the right second connecting rod and the frame form a four-connecting-rod structure, the other end of the right telescopic rod is hinged together with the frame, a dynamic feeding port is formed between the left movable lower discharging guide flap and the right movable lower discharging guide flap; the feeding cylinder is provided with a right lower discharging guide flap and a left lower discharging guide flap, the right lower discharging guide flap is located above the right movable lower discharging guide flap, the lower end of the right movable lower discharging guide flap is lower than the lower end of the right lower discharging guide flap, the lower end of the right movable lower discharging guide flap exceeds the right lower discharging guide flap to the left, the left lower discharging guide flap is located above the left movable lower discharging guide flap, the lower end of the left movable lower discharging guide flap is lower than the lower end of the left lower discharging guide flap, the lower end of the left movable lower discharging guide flap exceeds the left lower discharging guide flap to the right, a static feeding port is formed between the right lower discharging guide flap and the left lower discharging guide flap; the double-gate four-rod discharging structure of the roller mill further comprises a left supporting plate located below the left lower discharging guide flap and having an upper end fixed together with the feeding cylinder and a right supporting plate located below the right lower discharging guide flap and having an upper end fixed together with the feeding cylinder, the left lower discharging guide flap can move relative to the feeding cylinder, a left guide rod is fixedly connected to the lower surface of the left lower discharging guide flap and penetrates through the left supporting plate, a left damping spring is sleeved on the left guide rod and drives the left lower discharging guide flap to reset, a left soundproof sponge is arranged between the left supporting plate and the left lower discharging guide flap, and the left soundproof sponge is connected together with the left lower discharging guide flap and the left supporting plate when the left lower discharging guide flap is in a free state; the right lower discharging guide flap can move relative to the feeding cylinder, a right guide rod is fixedly connected to the lower surface of the right lower discharging guide flap and penetrates through the right supporting plate, a right damping spring is sleeved on the right guide rod and drives the right lower discharging guide flap to reset, a right soundproof sponge is arranged between the right supporting plate and the right lower discharging guide flap, and the right soundproof sponge is connected together with the right lower discharging guide flap and the right supporting plate when the right lower discharging guide flap is in a free state.The double-gate four-bar feeding structure of the roller mill also includes a water storage tank, a left-pressing nozzle, and a right-pressing nozzle. The water inlet pipe of the left-pressing nozzle extends into the water storage tank. The left-pressing nozzle is fixed to the left guide rod. Two left baffles distributed along the front-back direction are provided at the upper end of the left support plate. The left support plate and the two left baffles form a left water supply trough, and the nozzle of the left-pressing nozzle is located within the left water supply trough. Similarly, the water inlet pipe of the right-pressing nozzle extends into the water storage tank. The right-pressing nozzle is fixed to the right guide rod. Two right baffles distributed along the front-back direction are provided at the upper end of the right support plate. The right support plate and the two right baffles form a right water supply trough, and the nozzle of the right-pressing nozzle is located within the right water supply trough.

2. The double-gate four-bar feeding structure for the roller mill according to claim 1, characterized in that, The frame is hinged to the left moving feed guide gate via a left first forward-backward hinge axis. The left moving feed guide gate is hinged to the left first connecting rod via a left second forward-backward hinge axis. The left first connecting rod is hinged to the left second connecting rod and the left telescopic rod via a left third forward-backward hinge axis. The left second connecting rod is hinged to the frame via a left fourth forward-backward hinge axis. The left telescopic rod is hinged to the frame via a left fifth forward-backward hinge axis. The frame is hinged to the right moving feed guide gate via a right first forward-backward hinge axis. The right moving feed guide gate is hinged to the right first connecting rod via a right second forward-backward hinge axis. The right first connecting rod is hinged to the right second connecting rod and the right telescopic rod via a right third forward-backward hinge axis. The right second connecting rod is hinged to the frame via a right fourth forward-backward hinge axis. The right telescopic rod is hinged to the frame via a right fifth forward-backward hinge axis.

3. The double-gate four-bar feeding structure for a roller mill according to claim 1 or 2, characterized in that, The left telescopic rod is an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder, and the right telescopic rod is an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder.

4. The double-gate four-bar feeding structure for a roller mill according to claim 1 or 2, characterized in that, The hinge point between the left first link and the left moving unloading guide gate is located above the hinge point between the left moving unloading guide gate and the frame, and the hinge point between the right first link and the right moving unloading guide gate is located above the hinge point between the right moving unloading guide gate and the frame.

5. The double-gate four-bar feeding structure for a roller mill according to claim 1 or 2, characterized in that, The frame is provided with a left longitudinal beam, and the right side of the left longitudinal beam is provided with a right connecting lug and the left side is provided with a left connecting lug. The left moving feed guide gate is hinged to the right connecting lug of the left longitudinal beam, and the left second link is hinged to the left connecting lug of the left longitudinal beam. The frame is provided with a right longitudinal beam, and the right side of the right longitudinal beam is provided with a right connecting lug and the left side is provided with a left connecting lug. The right moving feed guide gate is hinged to the left connecting lug of the right longitudinal beam, and the right second link is hinged to the right connecting lug of the right longitudinal beam.

6. The double-gate four-bar feeding structure for the roller mill according to claim 5, characterized in that, The left second link is a curved rod structure that bends toward the left longitudinal beam, and the right second link is a curved rod structure that bends toward the right longitudinal beam.

7. The double-gate four-bar feeding structure for the roller mill according to claim 5, characterized in that, The left longitudinal beam includes a left longitudinal flat tube, an upper left longitudinal strip fixed to the upper surface of the left longitudinal flat tube, and a lower left longitudinal strip fixed to the lower surface of the left longitudinal flat tube. The left connecting lug of the left longitudinal beam is simultaneously connected to the left longitudinal flat tube, the upper left longitudinal strip, and the lower left longitudinal strip. The right longitudinal beam includes a right longitudinal flat tube, an upper right longitudinal strip fixed to the upper surface of the right longitudinal flat tube, and a lower right longitudinal strip fixed to the lower surface of the right longitudinal flat tube. The right connecting lug of the right longitudinal beam is simultaneously connected to the right longitudinal flat tube, the upper right longitudinal strip, and the lower right longitudinal strip.

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