Coal mine crushing equipment for raw ore mining of coal mine

Abstract

The utility model belongs to the technical field of crushing, and particularly relates to a coal mine crushing device for raw ore mining of a coal mine, which comprises a support frame, a crushing frame, a blanking hopper, a transmission shaft, a crushing wheel and the like, the crushing frame is mounted on one side of the upper part of the support frame, and the blanking hopper is mounted at the top end of the crushing frame; the two transmission shafts are distributed in parallel and rotationally arranged in the crushing frame, one end of each transmission shaft extends to the outside of the crushing frame, a crushing wheel is fixedly connected to the outside of each transmission shaft, and teeth of the two crushing wheels are distributed in a staggered mode. Through the arrangement of a screening plate of the screening assembly and a connecting frame screening plate structure, crushed coal briquettes can be screened, coal briquettes with qualified and unqualified sizes are effectively separated out, the screening precision and efficiency are improved, meanwhile, a swing rod of the material stirring assembly is periodically inserted into screening holes of the screening plate under the action of a torsion spring, a downward pressing contact block and the like, and the screening efficiency is improved. And accumulated coal briquettes are stirred, so that screening holes are prevented from being blocked, and smooth screening is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of crushing, and in particular relates to a coal mine crushing device used for raw ore mining in coal mines. Background Art

[0002] Coal ore mining refers to the process of extracting natural coal ore directly from a mine, without any prior beneficiation or other technical processing. It is the initial stage of coal production and includes exploration, feasibility studies, mine design, infrastructure construction, production, mine closure, and ecological restoration. Coal mining crushing equipment is specialized equipment that breaks up coal lumps and grinds them into pulverized coal. It is primarily used in coal processing, metallurgy, building materials, and refractory materials.

[0003] Although traditional coal mine crushing equipment can complete the crushing operation of coal mines, there is a problem of large differences in the size of crushed coal blocks during the actual crushing process. In order to meet the requirements of subsequent processes for particle size uniformity, it is usually necessary to add an additional screening process after crushing to separate out coal blocks with oversized sizes, which increases the complexity of the process flow. Moreover, for large-sized coal blocks separated during the screening process, they need to be transported back to the crushing equipment by manual labor or auxiliary equipment for re-crushing. The operation is cumbersome and labor-intensive, which further affects the improvement of production continuity and automation level.

[0004] Therefore, it is necessary to design a coal mine crushing equipment for coal ore mining to solve the above technical problems. Utility Model Content

[0005] In order to overcome the shortcomings of traditional coal mine crushing equipment, such as large differences in coal block sizes after crushing, the need to add a screening process, and the cumbersome re-crushing operation of large-sized coal blocks, which affects production continuity and automation, the utility model provides a coal mine crushing equipment for coal mine ore mining.

[0006] The utility model is realized through the following technical approaches: a coal mine crushing equipment for mining coal ore, including a support frame, a crushing frame, a lower hopper, a transmission shaft, a crushing wheel, a driving motor, a spur gear, a screening assembly, a material digging assembly, a material return assembly and a transmission assembly, the crushing frame is installed on one side of the upper support frame, the lower hopper is installed on the top of the crushing frame, two transmission shafts are distributed and rotated in parallel and arranged inside the crushing frame, one end of each transmission shaft extends to the outside of the crushing frame, and a crushing wheel is fixedly connected to the outside of each transmission shaft, and the teeth of the two crushing wheels are staggered and distributed with each other. The driving motor is installed on one side of the upper crushing frame, and the output shaft of the driving motor extends to the left and is fixedly connected to the other end of one of the transmission shafts through a coupling. One end of each transmission shaft is fixedly connected to a spur gear, and the two spur gears are distributed in parallel and mesh with each other. The screening assembly and the material digging assembly are both arranged between the crushing frame and the two transmission shafts, the material return assembly is arranged between the supporting frame, the crushing frame and the lower hopper, and the transmission assembly is arranged on the supporting frame.

[0007] Preferably, the screening assembly includes a screening plate, a connecting frame and a connecting plate. The connecting frame is slidably arranged at the lower part of the crushing frame, and the middle part of the connecting frame is designed as a screening plate structure. A rectangular partition is provided on the connecting frame. A guide groove for accommodating the sliding of the connecting frame is provided at the lower part of the crushing frame. The connecting frame contacts the lowest position of the guide groove. Multiple screening plates are distributed front and back and fixed to the connecting frame and are located inside the crushing frame. The sieve hole size of the screening plate is consistent with the sieve hole size of the connecting frame sieve plate structure. The two transversely aligned screening plates are relatively arranged. The lowest point of the inclined surface of each screening plate is close to the middle position of the connecting frame, thereby forming a material guide structure. Both sides of the connecting frame extend to the outside of the crushing frame and are fixed with a connecting plate respectively. Two slide grooves are provided on the upper part of each connecting plate, and are slidably connected to the eccentric position of the two drive shafts through these two slide grooves.

[0008] Preferably, the material-selecting assembly includes a connecting shaft, a rocker arm, a torsion spring and a downward-pressing contact block. The two connecting shafts are rotatably arranged side by side at the inner lower part of the crushing frame. Both ends of each connecting shaft extend to the outside of the crushing frame. A plurality of rocker arms arranged along its length are fixed to the outside of each connecting shaft. One end of the rocker arm on the same side is inserted into the sieve holes of the corresponding two screening plates. A slot for accommodating the swing of the rocker arm is provided at the lower part of the crushing frame, and the other end of the rocker arm contacts the lowest position of the slot. A torsion spring is sleeved at both ends of each connecting shaft, and both ends of each torsion spring are fixedly connected to the crushing frame and the corresponding connecting shaft respectively. A plurality of downward-pressing contact blocks distributed longitudinally are rotatably arranged on both sides of the lower part of the connecting frame, and the downward-pressing contact blocks contact the corresponding rocker arms.

[0009] Preferably, the return material assembly includes a guide frame, a rotating shaft, a first pulley, a transmission belt, a second pulley, a conveyor belt, a conveyor frame and an idler gear. The two guide frames are installed in parallel on the upper part of the support frame, and the crushing frame and the lower hopper are located between the two guide frames. Two rotating shafts distributed up and down are rotatably arranged inside each guide frame, and a conveyor belt is rotatably arranged between the two vertically aligned rotating shafts. The conveyor belt is located inside the corresponding guide frame and forms a close contact with the inner side wall of the guide frame. The surface of each conveyor belt is fixed with a plurality of conveyor frames distributed along its rotation trajectory. The first discharge port is opened on both sides of the lower part of the crushing frame. A lower part of each guide frame near the crushing frame A second discharge port is provided on the side, and the two first discharge ports are respectively aligned with the two second discharge ports. First return ports are provided on both sides of the lower part of the lower hopper, and a second return port is provided on the side of the upper part of each guide frame close to the crushing frame. The two first return ports are respectively aligned with the two second return ports. One end of the two rotating shafts located at a high position extends to the outside of the corresponding guide frame and is fixedly connected with a first pulley. Two second pulleys are rotatably provided on one side of the upper part of the crushing frame, and a transmission belt is rotatably provided between the first pulley and the corresponding second pulley. An idle tooth is fixed on each second pulley, and the number of the idle teeth is the same as that of the spur gear, and they correspond to each other one by one and mesh with each other.

[0010] Preferably, the conveying assembly includes a conveyor belt, a conveyor roller and a speed-regulating motor. The two conveyor rollers are rotatably arranged side by side inside the support frame. The conveyor belt is rotatably arranged between the outsides of the two conveyor rollers, and both sides of the conveyor belt are close to the inner wall of the support frame. The crushing frame is aligned with the upper right area of the conveyor belt. One end of the conveyor belt maintains a certain distance from the left inner wall of the support frame. This distance serves as the discharge channel for the coal blocks. The speed-regulating motor is installed on the lower side of the support frame, and its output shaft extends backward and is fixedly connected to one end of one of the conveyor rollers through a coupling.

[0011] Preferably, it also includes a material stopper tooth. A row of material stopper teeth distributed evenly is fixed on both sides of the upper part of the crushing frame. The teeth of the two crushing wheels are staggered with the two rows of material stopper teeth, and the two rows of material stopper teeth are respectively located below the two first return material ports.

[0012] Preferably, one end of each rocker rod is inverted and has an oblique angle.

[0013] Preferably, the pressing contact block adopts a roller structure.

[0014] Beneficial effects: 1. Through the setting of the screening plate of the screening assembly and the screen plate structure of the connecting frame, the crushed coal blocks can be screened, and the coal blocks of qualified and unqualified sizes can be effectively separated, thereby improving the accuracy and efficiency of screening. At the same time, the swing rod of the material-diverting assembly, under the action of the torsion spring and the downward pressure contact block, periodically inserts into the screen hole of the screening plate to dig the accumulated coal blocks, prevent the screen hole from being blocked, and ensure the smooth progress of screening.

[0015] Through the guide frame, rotating shaft, conveyor belt and other structures of the return assembly, the larger coal blocks after screening are automatically transported back to the lower hopper for re-crushing, realizing the cyclic crushing of large-sized coal blocks, ensuring that all coal blocks can be fully crushed and improving the crushing quality.

[0016] 2. Through the setting of the retaining teeth, and the teeth of the two crushing wheels are staggered with the two rows of retaining teeth, during the crushing process, the retaining teeth can accurately guide the coal blocks discharged from the first return port to the crushing wheel, increasing the contact opportunities between the coal blocks and the teeth of the crushing wheels, so that the coal blocks are more fully squeezed and sheared, thereby enhancing the crushing effect and improving the crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0018] Figure 2 It is a partial cross-sectional view of the lower hopper component of the utility model.

[0019] Figure 3 It is a left side plan view of the present invention.

[0020] Figure 4 It is a partial cross-sectional view of the crushing frame and lower hopper components of the utility model.

[0021] Figure 5 This is the first front plan view of the present utility model.

[0022] Figure 6 This is the second front plan view of the present invention.

[0023] Figure 7 It is a three-dimensional structural diagram of the screening plate, connecting frame, connecting plate and other components of the utility model.

[0024] Figure 8 It is a three-dimensional structural diagram of the material guide frame, conveyor belt, conveyor frame and other components of the utility model.

[0025] Figure 9 It is a schematic diagram of the three-dimensional structure of the conveying frame, the second discharge port, the second return port and other components of the utility model.

[0026] Figure numbers: 1. Support frame, 101. Crushing frame, 2. Discharge hopper, 3. Drive shaft, 4. Crushing wheel, 5. Drive motor, 6. Spur gear, 7. Material stopper, 8. Screening plate, 9. Connecting frame, 10. Connecting plate, 11. Connecting shaft, 12. Rocker arm, 13. Torsion spring, 14. Pressing contact block, 141. Guide frame, 15. Rotating shaft, 16. First pulley, 161. Conveyor belt, 162. Second pulley, 17. Conveyor belt, 18. Conveyor frame, 19. First discharge port, 191. Second discharge port, 20. First return port, 201. Second return port, 21. Idle gear, 22. Conveyor belt, 221. Conveyor roller, 23. Speed regulating motor. DETAILED DESCRIPTION

[0027] Example: A coal crushing device for coal ore mining, such as Figures 1-9 As shown, it includes a support frame 1, a crushing frame 101, a lower hopper 2, a transmission shaft 3, a crushing wheel 4, a drive motor 5, a spur gear 6, a screening assembly, a material shifting assembly, a material return assembly and a transmission assembly. The crushing frame 101 is bolted to the upper right side of the support frame 1, and the lower hopper 2 is bolted to the top of the crushing frame 101. Two transmission shafts 3 are arranged in parallel and rotated inside the crushing frame 101. The left end of each transmission shaft 3 extends to the outside of the crushing frame 101. A crushing wheel 4 is welded to the outside of each transmission shaft 3. Two crushing wheels are connected to the crushing frame 101. The teeth of the crushing wheel 4 are staggered with each other, the drive motor 5 is bolted to the upper right side of the crushing frame 101, the output shaft of the drive motor 5 extends to the left and is fixedly connected to the right end of the front drive shaft 3 through a coupling, and a spur gear 6 is welded to the left end of each drive shaft 3. The two spur gears 6 are distributed in parallel and mesh with each other. The screening assembly and the material shifting assembly are both arranged between the crushing frame 101 and the two drive shafts 3, the return material assembly is arranged between the support frame 1, the crushing frame 101 and the lower hopper 2, and the conveying assembly is arranged on the support frame 1.

[0028] like Figure 4 、 Figure 5 and Figure 7As shown, the screening assembly includes a screening plate 8, a connecting frame 9 and a connecting plate 10. The connecting frame 9 is slidably arranged at the lower part of the crushing frame 101. The middle part is designed as a screening plate structure. A rectangular partition is provided on the connecting frame 9, thereby dividing the screening plate structure of the connecting frame 9 into two screening areas. A guide groove for accommodating the sliding of the connecting frame 9 is opened at the lower part of the crushing frame 101. The connecting frame 9 contacts the lowest position of the guide groove. Four screening plates 8 are welded to the connecting frame 9 in a front-to-back distribution and are located inside the crushing frame 101. The sieve hole size of the screening plate 8 is consistent with the sieve hole size of the sieve plate structure of the connecting frame 9. The two transversely aligned screening plates 8 are arranged relative to each other. State, the lowest point of the inclined surface of each screening plate 8 is close to the middle position of the connecting frame 9, thereby forming a material guiding structure, which can guide the coal blocks to the screen plate structure of the connecting frame 9. The left and right sides of the connecting frame 9 extend to the outside of the crushing frame 101, and are respectively welded with a connecting plate 10. Two chutes are provided on the upper part of each connecting plate 10, and are slidably connected to the eccentric positions of the two transmission shafts 3 through these two chutes. Due to the eccentric design of the transmission shaft 3, when the transmission shaft 3 rotates, its eccentric part will slide relatively in the chute, thereby driving the connecting plate 10 to move up and down in the vertical direction.

[0029] like Figure 4 、 Figure 5 and Figure 7 As shown, the material-diverting assembly includes a connecting shaft 11, a rocker arm 12, a torsion spring 13 and a downward-pressing contact block 14. The two connecting shafts 11 are rotatably arranged side by side at the inner lower part of the crushing frame 101. The front and rear ends of each connecting shaft 11 extend to the outside of the crushing frame 101. A plurality of rocker arms 12 arranged along the length are welded to the outside of each connecting shaft 11. The upper ends of the rocker arms 12 on the same side are inserted into the sieve holes of the corresponding two screening plates 8. A notch is provided at the bottom of the crushing frame 101 to accommodate the swing of the rocker arms 12, and the lower ends of the rocker arms 12 contact the lowest position of the notch. The upper end of each rocker arm 12 is inverted and provided with an oblique angle to form a sharp end. In the process of inserting the rocker arm 12 into the sieve hole of the screening plate 8, the sharp end can play a good guiding role, making it easier to align and cut into the sieve hole, reducing the resistance during insertion, and making the material diverter 1 The rocker arm 12 is smoothly inserted into the sieve hole. A torsion spring 13 is provided at the front and rear ends of each connecting shaft 11. The two ends of each torsion spring 13 are fixedly connected to the crushing frame 101 and the corresponding connecting shaft 11 respectively, providing a reset force for the connecting shaft 11. Four longitudinally distributed downward pressure contact blocks 14 are rotatably provided on the left and right sides of the lower part of the connecting frame 9. The downward pressure contact blocks 14 are in contact with the corresponding rocker arm 12, and the downward pressure contact blocks 14 adopt a roller structure. When contacting the rocker arm 12 and applying pressure to it, the roller structure will interact with the contact surface of the rocker arm 12 in a rolling manner. This rolling contact can convert traditional sliding friction into rolling friction, greatly reduce friction resistance, and make the relative movement between the downward pressure contact block 14 and the rocker arm 12 smoother and more free.

[0030] like Figures 1-6 、 Figure 8 and Figure 9 As shown, the return material assembly includes a guide frame 141, a rotating shaft 15, a first pulley 16, a transmission belt 161, a second pulley 162, a conveyor belt 17, a conveyor frame 18 and an idler gear 21. The two guide frames 141 are bolted in parallel and connected to the upper part of the support frame 1. The crushing frame 101 and the lower hopper 2 are located between the two guide frames 141. Two rotating shafts 15 distributed up and down are rotatably arranged inside each guide frame 141. A conveyor belt 17 is rotatably arranged between the two vertically aligned rotating shafts 15. The conveyor belt 17 is located inside the corresponding guide frame 141 and forms a close contact with the inner side wall of the guide frame 141. A plurality of conveyor frames 18 distributed along its rotation trajectory are bonded to the surface of each conveyor belt 17. A first discharge port 19 is provided on both sides of the front and rear of the lower part of the crushing frame 101. The two screening areas of the connecting frame 9 are close to the two first discharge ports 19 respectively. A second discharge port 191 is provided on the lower part of the frame 141 near the crushing frame 101, and the two first discharge ports 19 are respectively aligned with the two second discharge ports 191. A first return port 20 is provided on both sides of the front and rear of the lower part of the lower hopper 2. A second return port 201 is provided on the upper part of each guide frame 141 near the crushing frame 101, and the two first return ports 20 are respectively aligned with the two second return ports 201. The left ends of the two rotating shafts 15 located at a high position extend to the outside of the corresponding guide frame 141 and are welded with a first pulley 16. Two second pulleys 162 are rotatably provided on the left side of the upper part of the crushing frame 101, and a transmission belt 161 is rotatably provided between the first pulley 16 and the corresponding second pulley 162. An idler tooth 21 is welded on each second pulley 162, and the number of the idler teeth 21 is the same as that of the spur gear 6, and they correspond one to one and mesh with each other.

[0031] like Figure 1 and Figure 2 As shown, the conveying assembly includes a conveyor belt 22, a conveyor roller 221 and a speed-regulating motor 23. The two conveyor rollers 221 are distributed and rotatably arranged side by side inside the support frame 1. The conveyor belt 22 is rotatably arranged between the outsides of the two conveyor rollers 221, and the front and rear sides of the conveyor belt 22 are close to the inner wall of the support frame 1 to prevent the gap between the conveyor belt 22 and the support frame 1 from causing leakage of coal blocks. The crushing frame 101 is aligned with the upper right area of the conveyor belt 22, and the left end of the conveyor belt 22 maintains a certain distance from the left inner wall of the support frame 1. This distance serves as a discharge channel for coal blocks. The speed-regulating motor 23 is bolted to the lower front side of the support frame 1, and its output shaft extends backward and is fixedly connected to the front end of the right conveyor roller 221 through a coupling.

[0032] like Figure 4As shown, it also includes blocking teeth 7. A row of equally spaced blocking teeth 7 are welded on both sides of the front and rear upper part of the crushing frame 101. The teeth of the two crushing wheels 4 are staggered with the two rows of blocking teeth 7 to prevent the presence of the blocking teeth 7 from affecting the normal rotation of the crushing wheel 4, and the two rows of blocking teeth 7 are respectively located below the two first return ports 20.

[0033] In the initial state of the device, the contact block 14 is pressed down to contact and press the corresponding pendulum 12. At this time, the pendulum 12 is in a stable position, fixing the angle of the connecting shaft 11. At the same time, the lower end of the pendulum 12 contacts the lowest position of the slot. The torsion spring 13 is in a deformed state, accumulating elastic potential energy, providing power for the subsequent swinging movement of the pendulum 12.

[0034] When the coal ore is mined and crushed, the operator puts the coal into the crushing frame 101 from the lower hopper 2. At the same time, the drive motor 5 is started, and its output shaft drives the front transmission shaft 3 to rotate clockwise, and the front spur gear 6 rotates clockwise and meshes with the rear spur gear 6. Under the transmission action of the meshing of the two spur gears 6, the rear transmission shaft 3 rotates counterclockwise followed by the rear spur gear 6, thereby causing the two crushing wheels 4 to rotate relative to each other. The surfaces of the two crushing wheels 4 are covered with sharp and hard teeth. During the relative rotation process, they exert strong squeezing and shearing forces on the coal, thereby starting the crushing operation.

[0035] During the crushing process, the coal ore is gradually turned into coal blocks under the strong action of the crushing wheel 4. These coal blocks fall onto the screening plate 8 and the connecting frame 9 under the action of gravity. Due to the eccentric design of the transmission shaft 3, its eccentric part slides relatively in the chute on the connecting plate 10, driving the connecting plate 10 to move up and down in the vertical direction. The connecting plate 10 drives the connecting frame 9 and the screening plate 8 to vibrate up and down. This vibration causes the coal blocks to roll and jump on the screening plate 8 and the connecting frame 9, thereby accelerating the screening process.

[0036] During screening, coal pieces smaller than the sieve holes of the screening plate 8 fall through the sieve holes smoothly, while coal pieces larger in size cannot pass through the sieve holes and are guided along the inclined guide structure of the screening plate 8 to the sieve plate structure of the connecting frame 9 for further screening, ensuring that the coal pieces that have not been fully screened on the screening plate 8 are further processed, thereby improving the accuracy and thoroughness of the overall screening;

[0037] When the connecting frame 9 moves upward, the pressing contact block 14 moves upward together. Since the pressing contact block 14 no longer applies pressure to the rocker arm 12, the torsion spring 13 returns to its original shape and releases the accumulated elastic potential energy. Under the action of the torsion spring 13, the connecting shaft 11 drives the rocker arm 12 to rotate and reset. When the connecting frame 9 moves downward, the pressing contact block 14 moves downward together, re-contacts and squeezes the corresponding rocker arm 12, prompting the rocker arm 12 to drive the connecting shaft 11 to rotate in the opposite direction and return to the initial angle. As the connecting frame 9 continues to move up and down, the rocker arm 12 periodically returns to its initial angle and inserts into the sieve hole of the screening plate 8. During the insertion process, the rocker arm 12 can move the coal blocks accumulated on the screening plate 8 to prevent the coal blocks from clogging the sieve hole, thereby ensuring smooth screening.

[0038] After screening, the larger coal lumps enter the conveying frame 18 in the guide frame 141 through the first discharge port 19 and the second discharge port 191. At this time, the rotation of the spur gear 6 drives the idle gear 21 to rotate, and the idle gear 21 drives the upper rotating shaft 15 to rotate through the second pulley 162, the conveyor belt 161 and the first pulley 16. The upper rotating shaft 15 and the lower rotating shaft 15 work together to make the conveyor belt 17 rotate. The conveying frame 18 rotates together with the conveyor belt 17, conveying the large-sized coal lumps upward and returning them to the lower hopper 2 through the second return port 201 and the first return port 20 for further crushing.

[0039] After screening, smaller coal blocks fall through the sieve holes of the sieve plate structure of the connecting frame 9 and finally fall onto the conveyor belt 22 of the conveying assembly. The speed regulating motor 23 is started, and its output drives the right conveyor roller 221 to rotate. The right conveyor roller 221 and the left conveyor roller 221 work together to make the conveyor belt 22 run, and transport the small-sized coal blocks to the left to the designated position, completing the crushing, screening and transportation process of the coal mine.

Claims

1. A coal crushing equipment for coal ore mining, characterized in that: The invention comprises a support frame (1), a crushing frame (101), a lower hopper (2), a transmission shaft (3), a crushing wheel (4), a driving motor (5), a spur gear (6), a screening assembly, a material shifting assembly, a material return assembly and a conveying assembly, wherein the crushing frame (101) is mounted on one side of the upper portion of the support frame (1), the lower hopper (2) is mounted on the top of the crushing frame (101), two transmission shafts (3) are arranged in parallel and rotatably inside the crushing frame (101), one end of each transmission shaft (3) extends to the outside of the crushing frame (101), and a crushing wheel (4) is fixedly connected to the outside of each transmission shaft (3). The two crushing wheels (4) are fixed to the outside of the crushing frame (101). The teeth of the wheel (4) are staggered and arranged. The drive motor (5) is installed on one side of the upper part of the crushing frame (101). The output shaft of the drive motor (5) extends to the left and is fixedly connected to the other end of one of the transmission shafts (3) through a coupling. A spur gear (6) is fixed to one end of each transmission shaft (3). The two spur gears (6) are arranged in parallel and mesh with each other. The screening component and the material shifting component are both arranged between the crushing frame (101) and the two transmission shafts (3). The material return component is arranged between the support frame (1), the crushing frame (101) and the lower hopper (2). The transmission component is arranged on the support frame (1).

2. The coal crushing equipment for coal ore mining according to claim 1, characterized in that: The screening assembly includes a screening plate (8), a connecting frame (9) and a connecting plate (10). The connecting frame (9) is slidably arranged at the lower part of the crushing frame (101). The middle part thereof is designed as a screening plate structure. A rectangular partition is provided on the connecting frame (9). A guide groove for accommodating the sliding of the connecting frame (9) is provided at the lower part of the crushing frame (101). The connecting frame (9) contacts the lowest position of the guide groove. A plurality of screening plates (8) are fixedly connected to the connecting frame (9) in front and back distribution and are located inside the crushing frame (101). The screening plates (8) The sieve hole size is consistent with the sieve hole size of the sieve plate structure of the connecting frame (9), and the two horizontally aligned sieve plates (8) are arranged relative to each other. The lowest point of the inclined surface of each sieve plate (8) is close to the middle position of the connecting frame (9), thereby forming a material guide structure. Both sides of the connecting frame (9) extend to the outside of the crushing frame (101) and are fixed with a connecting plate (10) respectively. Two chutes are opened on the upper part of each connecting plate (10), and are slidably connected to the eccentric position of the two transmission shafts (3) through the two chutes.

3. The coal crushing equipment for coal ore mining according to claim 2, characterized in that: The material shifting assembly includes a connecting shaft (11), a swing rod (12), a torsion spring (13) and a downward pressing contact block (14). The two connecting shafts (11) are arranged side by side and rotated in the inner lower part of the crushing frame (101). Both ends of each connecting shaft (11) extend to the outside of the crushing frame (101). Each connecting shaft (11) is fixed to the outside with multiple swing rods (12) arranged along its length. One end of the swing rod (12) on the same side is inserted into the sieve holes of the corresponding two screening plates (8). The crushing frame ( A slot is provided at the bottom of the connecting frame (101) to accommodate the swing of the swing rod (12), and the other end of the swing rod (12) contacts the lowest position of the slot. A torsion spring (13) is sleeved on both ends of each connecting shaft (11). Both ends of each torsion spring (13) are fixedly connected to the crushing frame (101) and the corresponding connecting shaft (11), respectively. A plurality of longitudinally distributed downward pressing contact blocks (14) are rotatably provided on both sides of the lower part of the connecting frame (9), and the downward pressing contact blocks (14) contact the corresponding swing rod (12).

4. The coal crushing equipment for coal ore mining according to claim 3, characterized in that: The return material assembly includes a guide frame (141), a rotating shaft (15), a first pulley (16), a transmission belt (161), a second pulley (162), a conveyor belt (17), a conveyor frame (18) and an idler gear (21). The two guide frames (141) are arranged in parallel on the upper part of the support frame (1). The crushing frame (101) and the lower hopper (2) are located between the two guide frames (141). Each guide frame (141) is provided with two upper and lower rotating gears. A conveyor belt (17) is provided between the rotating shaft (15) and the two rotating shafts (15) aligned vertically. The conveyor belt (17) is located inside the corresponding guide frame (141) and forms a close contact with the inner wall of the guide frame (141). The surface of each conveyor belt (17) is fixed with a plurality of conveyor frames (18) distributed along its rotation trajectory. A first discharge port (19) is provided on both sides of the lower part of the crushing frame (101). The lower part of each guide frame (141) is close to the crushing frame (1 01) is provided with a second discharge port (191) on one side, the two first discharge ports (19) are respectively aligned with the two second discharge ports (191), the lower side of the lower hopper (2) is provided with a first return port (20), the upper side of each guide frame (141) close to the crushing frame (101) is provided with a second return port (201), the two first return ports (20) are respectively aligned with the two second return ports (201), one end of the two rotating shafts (15) located at a high position extends to the outside of the corresponding guide frame (141) and is fixedly connected to a first pulley (16), two second pulleys (162) are rotatably provided on one side of the upper part of the crushing frame (101), a transmission belt (161) is rotatably provided between the first pulley (16) and the corresponding second pulley (162), and each second pulley (162) is fixedly connected with an idler tooth (21), the number of the idler teeth (21) is the same as that of the spur gear (6), and they correspond to each other one by one and mesh with each other.

5. The coal crushing equipment for coal ore mining according to claim 4, characterized in that: The conveying assembly includes a conveyor belt (22), a conveyor roller (221) and a speed regulating motor (23). The two conveyor rollers (221) are arranged side by side and are rotatably disposed inside the support frame (1). The conveyor belt (22) is rotatably disposed between the outsides of the two conveyor rollers (221), and both sides of the conveyor belt (22) are closely attached to the inner wall of the support frame (1). The crushing frame (101) is aligned with the upper right area of the conveyor belt (22). One end of the conveyor belt (22) maintains a certain distance from the left inner wall of the support frame (1). This distance serves as a discharge channel for coal blocks. The speed regulating motor (23) is installed on one side of the lower part of the support frame (1), and its output shaft extends backward and is fixedly connected to one end of one of the conveyor rollers (221) through a coupling.

6. The coal crushing equipment for coal ore mining according to claim 5, characterized in that: The crushing frame (101) further comprises a material blocking tooth (7), wherein a row of material blocking teeth (7) distributed evenly is fixedly connected to both sides of the upper portion of the crushing frame (101), the teeth of the two crushing wheels (4) are respectively arranged in an alternating manner with the two rows of material blocking teeth (7), and the two rows of material blocking teeth (7) are respectively located below the two first return material ports (20).

7. The coal crushing equipment for coal ore mining according to claim 6, characterized in that: One end of each swing rod (12) is inverted and provided with an oblique angle.

8. The coal crushing equipment for coal ore mining according to claim 7, characterized in that: The pressing contact block (14) adopts a roller structure.

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