Anti-blocking feeding device of multi-stage concentrating machine

Abstract

The invention discloses an anti-blocking feeding device of a multi-stage concentrating machine, and relates to the technical field of anti-blocking feeding devices of concentrating machines, the anti-blocking feeding device comprises a base, and the upper end of the base is fixedly connected with a sorting box and a mounting plate through a support; the screening mechanism comprises a first screening plate slidably connected to the inner wall of the sorting box, the two ends of the first screening plate penetrate through the side wall of the sorting box, a plurality of screening holes are formed in the upper end of the first screening plate and all penetrate through the first screening plate, and a first rotating shaft is rotatably connected to the lower end of the mounting plate; a plurality of first crushing cutters are fixedly connected to the side wall of the first rotating shaft, a fixing rod is fixedly connected to the side wall of the first rotating shaft, and a second rotating shaft is rotationally connected to the lower end of the fixing rod. The driving motor can crush and screen the ore, and the crushed and screened ore can be conveyed into the concentrating machine through the conveying device, so that the ore can be prevented from being too large in size to block the concentrating machine.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-blocking feeding devices for ore dressing machines, and particularly relates to a multi-stage anti-blocking feeding device for ore dressing machines. Background Art

[0002] An ore dressing machine, also known as an ore separator, is a special equipment for mining and mineral processing, which separates valuable minerals from waste or low-grade ores according to its inherent characteristics.

[0003] When the existing ore dressing machines are in use, ores are usually directly put into the ore dressing machines for separation. However, the sizes of the mined ores vary. Some ores with larger volumes are directly put into the ore dressing machines, which are extremely likely to cause blockage at the feeding ports, resulting in the ore dressing machines being unable to continue feeding and affecting the working efficiency of the ore dressing machines. Based on this, we propose a multi-stage anti-blocking feeding device for ore dressing machines. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a multi-stage anti-blocking feeding device for ore dressing machines is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A multi-stage anti-blocking feeding device for ore dressing machines, including a base, and a sorting box and a mounting plate are fixedly connected to the upper end of the base through brackets; A screening mechanism, the screening mechanism includes a first screening plate slidably connected to the inner wall of the sorting box, both ends of the first screening plate penetrate through the side wall of the sorting box, a plurality of screening holes are opened at the upper end of the first screening plate, and all the plurality of screening holes penetrate through the first screening plate. A first rotating shaft is rotatably connected to the lower end of the mounting plate, a plurality of first crushing knives are fixedly connected to the side wall of the first rotating shaft, a fixing rod is fixedly connected to the side wall of the first rotating shaft, a second rotating shaft is rotatably connected to the lower end of the fixing rod, and a plurality of second crushing knives are fixedly connected to the side wall of the second rotating shaft. A plurality of mounting blocks are fixedly connected to the lower end of the first screening plate. Among them, the side walls of two mounting blocks on the same side close to each other are jointly rotatably connected to a second screening plate. A plurality of arc-shaped cylinders are fixedly connected to the lower end of the first screening plate. The inner wall of each arc-shaped cylinder is hermetically slidably connected to an arc-shaped rod, and the other end of the arc-shaped rod is fixedly connected to the lower end of the second screening plate. A first spring is fixedly connected between the inner wall of the arc-shaped cylinder and the arc-shaped rod.

[0006] Preferably, a driving mechanism is installed on the mounting plate. The driving mechanism includes a rotating rod rotatably connected to the lower end of the mounting plate, a disc is fixedly connected to the lower end of the rotating rod, a first pin shaft is eccentrically fixedly connected to the lower end of the disc, a driving rod is rotatably connected to the side wall of the first pin shaft, a second pin shaft is fixedly connected to the upper end of the first screening plate, and the other end of the driving rod is rotatably connected to the second pin shaft.

[0007] Preferably, the driving mechanism further includes a motor fixedly connected to the upper end of the mounting plate, and the output end of the motor penetrates through the upper end of the mounting plate and is fixedly connected to the rotating rod.

[0008] Preferably, a power mechanism is installed on the rotating rod. The power mechanism includes a driving wheel fixedly connected to the side wall of the rotating rod, a driven wheel fixedly connected to the side wall of the first rotating shaft, the driving wheel is connected to the driven wheel through a synchronous belt, a gear is fixedly connected to the side wall of the second rotating shaft, a tooth ring is fixedly connected to the upper end of the sorting box through a bracket, and the gear is meshed with the tooth ring.

[0009] Preferably, a volume control mechanism is installed on the second rotating shaft. The volume control mechanism includes a vertical groove opened at the upper end of the second rotating shaft, a magnetic rod slidably connected to the inner wall of the vertical groove, a resistance wheel fixedly connected to the upper end of the magnetic rod, a second spring fixedly connected between the bottom of the vertical groove and the magnetic rod, and an electromagnet fixedly connected to the bottom of the vertical groove.

[0010] Preferably, the volume control mechanism further includes a control box fixedly connected to the upper end of the mounting plate. A conductive slider is hermetically slidably connected to the inner wall of the control box. A third spring is fixedly connected between the inner wall of the control box and the conductive slider. A resistance strip is fixedly embedded in the inner wall of the control box. An infrared sensor is installed on the inner wall of the screening hole. The electromagnet, the conductive slider, the resistance strip, the infrared sensor and an external control switch are connected through a PLC control circuit.

[0011] Preferably, a pushing mechanism for driving the conductive slider to move is installed on the arc-shaped cylinder. The pushing mechanism includes a one-way intake pipe fixedly connected to the inner wall of the arc-shaped cylinder. The arc-shaped cylinder is communicated with the control box through a one-way exhaust pipe, and an exhaust hole is opened on the inner wall of the control box.

[0012] Preferably, the aperture of the exhaust hole is smaller than the inner diameter of the one-way exhaust pipe.

[0013] Preferably, a conveying device for conveying the ore is installed on the base.

[0014] The present invention has the following beneficial effects: 1. By providing a screening mechanism and a driving mechanism, driving the motor, the ore can be crushed and screened. The crushed and screened ore will be conveyed into the ore dressing machine through the conveying device, thereby avoiding the ore with too large volume from blocking the ore dressing machine; 2. By setting up a power mechanism, when the first rotating shaft rotates, it will synchronously drive the fixed rod to rotate, and then drive the second rotating shaft to rotate around the center of the first rotating shaft, driving multiple second crushing knives to move in a circular motion. And because the gear meshes with the toothed ring, the toothed ring can make the gear rotate, and then drive the second rotating shaft to rotate self - synchronously, driving multiple second crushing knives to rotate self - synchronously, which can increase the crushing range, uniformly crush the ores at various positions in the sorting box, and make the volume of the crushed ores as uniform as possible; 3. By setting up a volume control mechanism and a pushing mechanism, the crushing effect can be automatically adjusted according to the volume of the ores after crushing and screening. Furthermore, the volume of the crushed ores can be effectively controlled within a certain range, making the volume of the ores input into the ore - dressing machine uniform; 4. When the volume of the crushed ores is too large to pass through the screening holes, at this time, the infrared sensor cannot sense the dropping of ores in the screening holes and will send a signal, causing the control switch to disconnect. As a result, the electromagnet cannot be powered on, and the resistance wheel and the driven wheel are separated from each other, without mutual friction to reduce the rotation speed. At this time, the first crushing knife and the second crushing knife will rotate at the fastest speed, and the crushing efficiency of the ores is the highest. When the volume of the crushed ores is less than the droppable space formed by the four second screening plates when entering the screening holes, at this time, the dropping of the ores cannot squeeze the second screening plates, and thus the conductive slider cannot move. It is located at the position where the resistance of the resistance bar connected to the circuit is the smallest. And at this time, the infrared sensor can sense the dropping of ores in the screening holes, and then the control switch will close. At this time, the current passed through the electromagnet is the largest, and thus the magnetic repulsion force generated is the strongest, making the dynamic friction force between the resistance wheel and the driven wheel the largest. As a result, the rotation speed of the driven wheel and the second rotating shaft is in the slowest state, making the crushing efficiency of the first crushing knife and the second crushing knife drop to the lowest, so as to avoid the ores being crushed too small. Therefore, it can be automatically adjusted to avoid the volume of the crushed ores being too large or too small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three - dimensional structural schematic diagram of a multi - stage ore - dressing machine anti - blocking feeding device proposed by the present invention; Figure 2 is Figure 1 the rear - view schematic diagram of the structure in Figure 3 is Figure 1 the sectional structural schematic diagram of the sorting box in Figure 4 is Figure 3 the sectional structural schematic diagram of the first screening plate in Figure 5 is Figure 3 the enlarged schematic diagram of the structure at A in Figure 6 is Figure 3 the enlarged schematic diagram of the structure at B in Figure 7 is Figure 4 a schematic enlarged view of the structure at position C in Figure 8 a schematic circuit connection diagram of an infrared sensor, a conductive slider, a resistance strip, and an electromagnet.

[0016] In the figure: 1, base; 2, sorting box; 3, mounting plate; 4, first screening plate; 5, screening holes; 6, first rotating shaft; 7, first crushing knife; 8, fixed rod; 9, second crushing knife; 10, mounting block; 11, second screening plate; 12, arc-shaped cylinder; 13, arc-shaped rod; 14, first spring; 15, rotating rod; 16, disc; 17, first pin shaft; 18, driving rod; 19, second pin shaft; 20, motor; 21, driving wheel; 22, driven wheel; 23, gear; 24, toothed ring; 25, second rotating shaft; 26, vertical groove; 27, magnetic rod; 28, resistance wheel; 29, second spring; 30, electromagnet; 31, control box; 32, conductive slider; 33, third spring; 34, resistance strip; 35, exhaust hole; 36, one-way intake pipe; 37, one-way exhaust pipe; 38, infrared sensor; 39, conveying device. Detailed implementation manners

[0017] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0018] Referring to Figures 1 - 8 , a multi-stage ore dressing machine anti-blocking feeding device includes a base 1, and a sorting box 2 and a mounting plate 3 are fixedly connected to the upper end of the base 1 through brackets. A conveying device 39 for conveying ore is installed on the base 1; The screening mechanism includes a first screening plate 4 slidably connected to the inner wall of the sorting box 2. Both ends of the first screening plate 4 penetrate through the side wall of the sorting box 2. A plurality of screening holes 5 are formed in the upper end of the first screening plate 4, and all the plurality of screening holes 5 penetrate through the first screening plate 4. A first rotating shaft 6 is rotatably connected to the lower end of the mounting plate 3. A plurality of first crushing knives 7 are fixedly connected to the side wall of the first rotating shaft 6. A fixing rod 8 is fixedly connected to the side wall of the first rotating shaft 6. A second rotating shaft 25 is rotatably connected to the lower end of the fixing rod 8. A plurality of second crushing knives 9 are fixedly connected to the side wall of the second rotating shaft 25. A plurality of mounting blocks 10 are fixedly connected to the lower end of the first screening plate 4. Among them, the side walls of two mounting blocks 10 on the same side are rotatably connected to a second screening plate 11 together. A plurality of arc-shaped cylinders 12 are fixedly connected to the lower end of the first screening plate 4. An arc-shaped rod 13 is hermetically slidably connected to the inner wall of each arc-shaped cylinder 12. The other end of the arc-shaped rod 13 is fixedly connected to the lower end of the second screening plate 11. A first spring 14 is fixedly connected between the inner wall of the arc-shaped cylinder 12 and the arc-shaped rod 13.

[0019] A driving mechanism is installed on the mounting plate 3. The driving mechanism includes a rotating rod 15 rotatably connected to the lower end of the mounting plate 3. A disc 16 is fixedly connected to the lower end of the rotating rod 15. A first pin shaft 17 is eccentrically fixedly connected to the lower end of the disc 16. A driving rod 18 is rotatably connected to the side wall of the first pin shaft 17. A second pin shaft 19 is fixedly connected to the upper end of the first screening plate 4. The other end of the driving rod 18 is rotatably connected to the second pin shaft 19.

[0020] The driving mechanism further includes a motor 20 fixedly connected to the upper end of the mounting plate 3. The output end of the motor 20 penetrates through the upper end of the mounting plate 3 and is fixedly connected to the rotating rod 15.

[0021] A power mechanism is installed on the rotating rod 15. The power mechanism includes a driving wheel 21 fixedly connected to the side wall of the rotating rod 15. A driven wheel 22 is fixedly connected to the side wall of the first rotating shaft 6. The driving wheel 21 is connected to the driven wheel 22 through a synchronous belt. A gear 23 is fixedly connected to the side wall of the second rotating shaft 25. A toothed ring 24 is fixedly connected to the upper end of the sorting box 2 through a bracket. The gear 23 is meshed with the toothed ring 24.

[0022] Further, put the ore into the sorting box 2, then start the motor 20 to drive the rotating rod 15 to rotate, and then drive the driving wheel 21 to rotate, thereby driving the driven wheel 22 to rotate, driving the first rotating shaft 6 to rotate, driving a plurality of first crushing knives 7 to rotate, and crushing the ore in the sorting box 2 until the crushed ore can fall through the screening holes 5 and fall onto the conveying device 39, and then the conveying device 39 conveys it into the ore dressing machine, which can prevent the ore from being too large in volume and blocking the ore dressing machine. The rotating rod 15 will synchronously drive the disc 16 to rotate, driving the first pin shaft 17 to rotate eccentrically. The first pin shaft 17 will drive the first screening plate 4 to reciprocate horizontally through the driving rod 18, and can quickly screen the crushed ore so that it can quickly fall through the screening holes 5, improving the screening efficiency.

[0023] Furthermore, the rotation of the first rotating shaft 6 will synchronously drive the rotation of the fixed rod 8, thereby driving the second rotating shaft 25 to rotate around the center of the first rotating shaft 6, driving a plurality of second crushing knives 9 to move in a circular motion. And because the gear 23 meshes with the toothed ring 24, the toothed ring 24 can cause the gear 23 to rotate, thereby driving the second rotating shaft 25 to rotate self, driving a plurality of second crushing knives 9 to rotate synchronously, which can increase the crushing range, evenly crush the ores at various positions in the sorting box 2, and make the volume of the crushed ores as uniform as possible.

[0024] A volume control mechanism is installed on the second rotating shaft 25. The volume control mechanism includes a vertical groove 26 opened at the upper end of the second rotating shaft 25. A magnetic rod 27 is slidably connected to the inner wall of the vertical groove 26. The upper end of the magnetic rod 27 is fixedly connected to a resistance wheel 28. A second spring 29 is fixedly connected between the bottom of the vertical groove 26 and the magnetic rod 27. An electromagnet 30 is fixedly connected to the bottom of the vertical groove 26.

[0025] The volume control mechanism further includes a control box 31 fixedly connected to the upper end of the mounting plate 3. A conductive slider 32 is hermetically slidably connected to the inner wall of the control box 31. A third spring 33 is fixedly connected between the inner wall of the control box 31 and the conductive slider 32. A resistance strip 34 is fixedly embedded in the inner wall of the control box 31. An infrared sensor 38 is installed on the inner wall of the screening hole 5. The electromagnet 30, the conductive slider 32, the resistance strip 34, the infrared sensor 38 and an external control switch are connected through a PLC control circuit.

[0026] A pushing mechanism for driving the conductive slider 32 to move is installed on the arc-shaped cylinder 12. The pushing mechanism includes a one-way air inlet pipe 36 fixedly connected to the inner wall of the arc-shaped cylinder 12. The one-way air inlet pipe 36 only allows external air to enter the arc-shaped cylinder 12. The arc-shaped cylinder 12 is communicated with the control box 31 through a one-way exhaust pipe 37. The one-way exhaust pipe 37 only allows the air in the arc-shaped cylinder 12 to enter the control box 31. And the one-way exhaust pipe 37 is made of a flexible hose. An exhaust hole 35 is opened on the inner wall of the control box 31. The aperture of the exhaust hole 35 is much smaller than the inner diameter of the one-way exhaust pipe 37.

[0027] Further, when crushing the ore, the ore near the bottom layer in the sorting box 2 will preferentially fall through the screening holes 5, while the ore located in the upper layer can only fall through the screening holes 5 after the ore in the bottom layer has fallen. Therefore, the crushing time of the ore in the upper layer will be longer than that of the bottom layer. So, the smaller the volume of the ore after crushing will be as it gets closer to the upper layer, resulting in uneven volume of the conveyed ore. Since there are four inclined second screening plates 11 arranged below each screening hole 5, a droppable space will be formed between the lowermost ends of the four second screening plates 11. Therefore, when the ore falls through the screening hole 5, if its size is between the diameter of the screening hole 5 and the droppable space formed by the four second screening plates 11, when the ore falls, it will squeeze the second screening plates 11, causing the second screening plates 11 to rotate and expand outwards. Further, the second screening plates 11 will drive the arc-shaped rod 13 to move, so that the air in the arc-shaped cylinder 12 will enter the control box 31 through the one-way exhaust pipe 37. Since the pipe diameter of the one-way exhaust pipe 37 is much larger than the diameter of the exhaust hole 35, the air intake speed in the control box 31 is greater than the exhaust speed. So, it will push the conductive slider 32 to slide rightward and seal in the control box 31 (as Figure 6 shown), and further the resistance of the resistance strip 34 connected to the circuit will be smaller. So, when the volume of the crushed ore is larger, the rotation amplitude of squeezing the second screening plates 11 when falling through the screening hole 5 will be greater, thus the more air will be pumped into the control box 31, the more to the right the position of the conductive slider 32 will be, and further the resistance connected to the circuit will be greater. Since an infrared sensor 38 is arranged in the screening hole 5, when the infrared sensor 38 senses that there is ore falling in the screening hole 5, it will send a signal to control the control switch to turn on through the PLC control circuit, so that the circuit of the electromagnet 30 is connected (as Figure 8 shown). Further, at this time, the electromagnet 30 will be energized to generate a magnetic repulsive force, pushing the magnetic rod 27 to move upwards, and further driving the resistance wheel 28 to abut against the lower end of the driven wheel 22. And the rotation directions between the resistance wheel 28 and the driven wheel 22 are opposite, so a dynamic frictional force will be generated between the resistance wheel 28 and the driven wheel 22, which can reduce the rotation speeds of the driven wheel 22 and the second rotating shaft 25. And when the volume of the ore is larger, the current passed through the electromagnet 30 will be smaller, thus the generated magnetic repulsive force will be smaller, the pressure exerted by the resistance wheel 28 on the driven wheel 22 will be smaller, and further the dynamic frictional force will be smaller, and the rotation speeds of the driven wheel 22 and the second rotating shaft 25 will be faster. So, the rotation speeds of the first crushing knife 7 and the second crushing knife 9 will be faster, improving the crushing effect and making the volume of the crushed ore decrease accordingly. On the contrary, if the volume of the ore entering the screening hole 5 is smaller, the rotation speeds of the first crushing knife 7 and the second crushing knife 9 will be slower, reducing the crushing effect and making the volume of the crushed ore larger. Further, the volume of the crushed ore can be controlled within a certain range, so that it will not be too large or too small and will be kept as uniform as possible.

[0028] It is worth mentioning that when the volume of the crushed ore is too large to pass through the screening hole 5, at this time, the infrared sensor 38 cannot sense the ore falling in the screening hole 5, and will send a signal to disconnect the control switch. As a result, the electromagnet 30 cannot be energized, causing the resistance wheel 28 to separate from the driven wheel 22, and no mutual friction will occur to reduce the rotation speed. At this time, the first crushing knife 7 and the second crushing knife 9 will rotate at the fastest speed, and the crushing efficiency of the ore is the highest. When the volume of the crushed ore is less than the droppable space formed by the four second screening plates 11 when it enters the screening hole 5, the ore drop cannot squeeze the second screening plate 11 at this time, and thus the conductive slider 32 cannot move. The resistance bar 34 is located at the position with the smallest resistance in the circuit. And at this time, the infrared sensor 38 can sense the ore falling in the screening hole 5, and then the control switch will close. At this time, the current passing through the electromagnet 30 is the largest, and thus the magnetic repulsive force generated is the strongest, making the dynamic friction force between the resistance wheel 28 and the driven wheel 22 the largest. As a result, the rotation speed of the driven wheel 22 and the second rotating shaft 25 is in the slowest state, reducing the crushing efficiency of the first crushing knife 7 and the second crushing knife 9 to the lowest, thus avoiding the ore from being crushed too small. Therefore, it can be automatically adjusted to avoid the volume of the crushed ore being too large or too small.

[0029] In the present invention, the ore is placed into the sorting box 2, and then the motor 20 is started to drive the rotating rod 15 to rotate, which in turn drives the driving wheel 21 to rotate, thereby driving the driven wheel 22 to rotate, driving the first rotating shaft 6 to rotate, and driving a plurality of first crushing knives 7 to rotate to crush the ore in the sorting box 2 until the crushed ore can fall through the screening hole 5 and land on the conveying device 39, and then be conveyed by the conveying device 39 to the ore dressing machine, which can avoid the ore volume being too large to block the ore dressing machine. The rotating rod 15 will synchronously drive the disc 16 to rotate, driving the first pin shaft 17 to rotate eccentrically. The first pin shaft 17 will drive the first screening plate 4 to reciprocate horizontally through the driving rod 18, and can quickly screen the crushed ore, enabling it to quickly fall through the screening hole 5 and improving the screening efficiency.

[0030] In addition, the rotation of the first rotating shaft 6 will synchronously drive the fixed rod 8 to rotate, which in turn drives the second rotating shaft 25 to rotate around the center of the first rotating shaft 6, driving a plurality of second crushing knives 9 to move in a circular motion. And because the gear 23 meshes with the toothed ring 24, the toothed ring 24 can cause the gear 23 to rotate, which in turn drives the second rotating shaft 25 to rotate self - synchronously, driving a plurality of second crushing knives 9 to rotate self - synchronously, which can increase the crushing range and uniformly crush the ore at various positions in the sorting box 2, making the volume of the crushed ore as uniform as possible.

[0031] When crushing ore, the ore near the bottom layer in the sorting box 2 will preferentially fall through the screening holes 5, while the ore located in the upper layer can only fall through the screening holes 5 after the ore in the bottom layer has fallen. Therefore, the crushing time of the ore in the upper layer will be longer than that of the bottom layer. So, the smaller the volume of the crushed ore will be as it gets closer to the upper layer, resulting in uneven volume of the conveyed ore. Since there are four inclined second screening plates 11 arranged below each screening hole 5, a droppable space will be formed between the lowermost ends of the four second screening plates 11. Therefore, when the ore falls through the screening hole 5, if its size is between the diameter of the screening hole 5 and the droppable space formed by the four second screening plates 11, when the ore falls, it will squeeze the second screening plates 11, causing the second screening plates 11 to rotate and expand outwards. Furthermore, the second screening plates 11 will drive the arc-shaped rods 13 to move, enabling the air in the arc-shaped cylinder 12 to enter the control box 31 through the one-way exhaust pipe 37. Since the diameter of the one-way exhaust pipe 37 is larger than the diameter of the exhaust hole 35, the air intake speed in the control box 31 is greater than the exhaust speed. So, it will push the conductive slider 32 to slide rightward and seal in the control box 31 (as Figure 6 shown), and thus the resistance of the resistance strip 34 connected to the circuit will be smaller. Therefore, when the volume of the crushed ore is larger, the rotation amplitude of squeezing the second screening plates 11 when falling through the screening hole 5 will be greater, and thus more air will be pumped into the control box 31. The position of the conductive slider 32 will be more to the right, and thus the resistance connected to the circuit will be larger. Since there is an infrared sensor 38 arranged in the screening hole 5, when the infrared sensor 38 senses that there is ore falling in the screening hole 5, it will send a signal to control the control switch to turn on through the PLC control circuit, enabling the circuit of the electromagnet 30 to be connected (as Figure 8 shown). Furthermore, at this time, the electromagnet 30 will be energized to generate a magnetic repulsive force, pushing the magnetic rod 27 to move upwards, and then driving the resistance wheel 28 to abut against the lower end of the driven wheel 22. And the rotation directions between the resistance wheel 28 and the driven wheel 22 are opposite. So, a dynamic frictional force will be generated between the resistance wheel 28 and the driven wheel 22, which can reduce the rotation speeds of the driven wheel 22 and the second rotating shaft 25. And when the volume of the ore is larger, the current passed through the electromagnet 30 will be smaller, and thus the generated magnetic repulsive force will be smaller. The pressure exerted by the resistance wheel 28 on the driven wheel 22 will be smaller, and thus the dynamic frictional force will be smaller. The rotation speeds of the driven wheel 22 and the second rotating shaft 25 will be faster. So, the rotation speeds of the first crushing knife 7 and the second crushing knife 9 will be faster, improving the crushing effect and making the volume of the crushed ore decrease accordingly. On the contrary, if the volume of the ore entering the screening hole 5 is smaller, the rotation speeds of the first crushing knife 7 and the second crushing knife 9 will be slower, reducing the crushing effect and making the volume of the crushed ore larger. Furthermore, the volume of the crushed ore can be controlled within a certain range, so that it will not be too large or too small and will be kept as uniform as possible.

[0032] When the volume of the crushed ore is too large to pass through the screening hole 5, the infrared sensor 38 cannot sense the ore falling in the screening hole 5 at this time, and will send a signal to make the control switch disconnect. As a result, the electromagnet 30 cannot be energized, so that the resistance wheel 28 and the driven wheel 22 are separated from each other, and no mutual friction will occur to reduce the rotation speed. At this time, the first crushing knife 7 and the second crushing knife 9 will rotate at the fastest speed, and the crushing efficiency of the ore is the highest. When the volume of the crushed ore is smaller than the droppable space formed by the four second screening plates 11 when it enters the screening hole 5, the ore cannot squeeze the second screening plate 11 when it drops at this time, so that the conductive slider 32 cannot move, and is located at the position where the resistance of the resistance bar 34 connected to the circuit is the smallest. And at this time, the infrared sensor 38 can sense that there is ore falling in the screening hole 5, so the control switch will close. At this time, the current passed into the electromagnet 30 is the largest, and the generated magnetic repulsive force is the strongest, so that the dynamic friction force between the resistance wheel 28 and the driven wheel 22 is the largest. As a result, the rotation speed of the driven wheel 22 and the second rotating shaft 25 is in the slowest state, and the crushing efficiency of the first crushing knife 7 and the second crushing knife 9 is reduced to the lowest, so as to avoid the ore being crushed too small. Therefore, it can be automatically adjusted to avoid the volume of the crushed ore being too large or too small.

[0033] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-stage ore dressing machine anti-blocking material feeding device, characterized in that, Including: A base (1), the upper end of the base (1) is fixedly connected with a sorting box (2) and a mounting plate (3) through a bracket; A screening mechanism, the screening mechanism includes a first screening plate (4) slidably connected to the inner wall of the sorting box (2), both ends of the first screening plate (4) penetrate through the side wall of the sorting box (2), a plurality of screening holes (5) are opened at the upper end of the first screening plate (4), and all the plurality of screening holes (5) penetrate through the first screening plate (4). A first rotating shaft (6) is rotatably connected to the lower end of the mounting plate (3), a plurality of first crushing knives (7) are fixedly connected to the side wall of the first rotating shaft (6), a fixing rod (8) is fixedly connected to the side wall of the first rotating shaft (6), a second rotating shaft (25) is rotatably connected to the lower end of the fixing rod (8), a plurality of second crushing knives (9) are fixedly connected to the side wall of the second rotating shaft (25), a plurality of mounting blocks (10) are fixedly connected to the lower end of the first screening plate (4), and two mounting blocks (10) on the same side are rotatably connected to a second screening plate (11) on the mutually approaching side walls. A plurality of arc-shaped cylinders (12) are fixedly connected to the lower end of the first screening plate (4), an arc-shaped rod (13) is hermetically slidably connected to the inner wall of each arc-shaped cylinder (12), the other end of the arc-shaped rod (13) is fixedly connected to the lower end of the second screening plate (11), and a first spring (14) is fixedly connected between the inner wall of the arc-shaped cylinder (12) and the arc-shaped rod (13).

2. The anti-blocking feeding device of a multi-stage ore dressing machine according to claim 1, wherein Among them: A driving mechanism is installed on the mounting plate (3), the driving mechanism includes a rotating rod (15) rotatably connected to the lower end of the mounting plate (3), a disc (16) is fixedly connected to the lower end of the rotating rod (15), a first pin shaft (17) is eccentrically fixedly connected to the lower end of the disc (16), a driving rod (18) is rotatably connected to the side wall of the first pin shaft (17), and a second pin shaft (19) is fixedly connected to the upper end of the first screening plate (4), and the other end of the driving rod (18) is rotatably connected to the second pin shaft (19).

3. The anti-blocking material feeding device for a multi-stage ore dressing machine according to claim 2, characterized in that, Among them: The driving mechanism further includes a motor (20) fixedly connected to the upper end of the mounting plate (3), and the output end of the motor (20) penetrates through the upper end of the mounting plate (3) and is fixedly connected to the rotating rod (15).

4. The anti-blocking material feeding device for a multi-stage ore dressing machine according to claim 2, characterized in that, Among them: A power mechanism is installed on the rotating rod (15), the power mechanism includes a driving wheel (21) fixedly connected to the side wall of the rotating rod (15), a driven wheel (22) is fixedly connected to the side wall of the first rotating shaft (6), the driving wheel (21) is connected to the driven wheel (22) through a synchronous belt, a gear (23) is fixedly connected to the side wall of the second rotating shaft (25), a gear ring (24) is fixedly connected to the upper end of the sorting box (2) through a bracket, and the gear (23) is meshed with the gear ring (24).

5. The anti-blocking material feeding device for a multi-stage ore dressing machine according to claim 1, characterized in that, Among them: A volume control mechanism is installed on the second rotating shaft (25). The volume control mechanism includes a vertical groove (26) formed at the upper end of the second rotating shaft (25). A magnetic rod (27) is slidably connected to the inner wall of the vertical groove (26). A resistance wheel (28) is fixedly connected to the upper end of the magnetic rod (27). A second spring (29) is fixedly connected between the bottom of the vertical groove (26) and the magnetic rod (27). An electromagnet (30) is fixedly connected to the bottom of the vertical groove (26).

6. The anti-blocking feeding device of a multi-stage ore dressing machine according to claim 5, characterized in that, Wherein: The volume control mechanism further includes a control box (31) fixedly connected to the upper end of the mounting plate (3). A conductive slider (32) is slidably connected to the inner wall of the control box (31) in a sealed manner. A third spring (33) is fixedly connected between the inner wall of the control box (31) and the conductive slider (32). A resistance strip (34) is fixedly embedded in the inner wall of the control box (31). An infrared sensor (38) is installed on the inner wall of the screening hole (5). The electromagnet (30), the conductive slider (32), the resistance strip (34), the infrared sensor (38) and an external control switch are connected through a PLC control circuit.

7. The anti-blocking material feeding device for a multi-stage ore dressing machine according to claim 6, characterized in that, Wherein: A pushing mechanism for driving the conductive slider (32) to move is installed on the arc-shaped cylinder (12). The pushing mechanism includes a one-way intake pipe (36) fixedly connected to the inner wall of the arc-shaped cylinder (12). The arc-shaped cylinder (12) is communicated with the control box (31) through a one-way exhaust pipe (37). An exhaust hole (35) is formed in the inner wall of the control box (31).

8. A multi-stage ore dressing machine anti-blocking material feeding device according to claim 7, characterized in that, Wherein: The aperture of the exhaust hole (35) is smaller than the inner diameter of the one-way exhaust pipe (37).

9. The anti-blocking material feeding device for a multi-stage ore dressing machine according to claim 1, characterized in that, Wherein: A conveying device (39) for conveying ores is installed on the base (1).

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