A pre-impurity removal special mechanism based on a roller screen raw coal separation process

Abstract

The present application relates to the technical field of raw coal separation, and discloses a special impurity removal mechanism based on a raw coal separation process of a roller screen, which comprises a box body one, a supporting frame arranged at the bottom of the box body one, a baffle one arranged at one side of the box body one, a conveying belt arranged on the inner side wall of the box body one, and an impurity removal mechanism arranged on the inner side wall of the box body one. The impurity removal mechanism comprises a shaft body one, a shaft sleeve and a gear box. The shaft body one is rotationally connected to the inner side wall of the box body one. The shaft sleeve is sleeved on the outer side wall of the shaft body one, and the outer side wall of the shaft sleeve is provided with a hook tooth. The gear box is fixed to one side of the box body one, and a motor is arranged on the gear box. The output end of the gear box is connected to the shaft body one. The motor is used to drive the shaft body one to rotate, and the hook tooth on the shaft sleeve is used to comb and pick up the raw coal on the conveying belt. The through groove on the hook tooth can reduce the adhesion of the raw coal. The recess can effectively engage the soft impurities and metal components, so that the impurities are preliminarily separated, the impurities are prevented from directly entering the subsequent screening link, and the risk of jamming is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of raw coal sorting, specifically to a pre-impurity removal mechanism based on a roller screen raw coal sorting process. Background Technology

[0002] Roller screen raw coal sorting equipment is a commonly used raw coal particle size classification device in the fields of coal washing, power fuel supply and mining material processing. It mainly consists of a drive system, screen shaft assembly and frame. During operation, multiple parallel screen shafts are driven to rotate synchronously by a motor and reducer through chain or gear transmission. The screen plates or toothed structures arranged in a regular pattern on the screen shaft cooperate with each other to form a fixed screening gap. After the raw coal enters the screen surface through the feed port, it is tumbled and conveyed forward under the action of friction and thrust generated by the rotation of the screen shaft. Fine raw coal particles with a particle size smaller than the screen shaft gap will fall through the screening gap to form undersize products, while large raw coal particles and gangue with a particle size larger than the gap are conveyed along the screen surface to the end and discharged to form oversize products, thus completing the particle size classification of raw coal.

[0003] The underground mining environment in coal mines is complex. During the mining and underground transfer stages, raw coal often becomes mixed with soft impurities such as wood, rubber, and woven bags, as well as metal components such as anchor bolts, metal mesh, and steel ladders. These impurities, once carried into the belt conveyor system and subsequent coal preparation processes, can easily cause pipeline blockages and equipment malfunctions, leading not only to production interruptions but also affecting the stable operation of various automated equipment in the coal preparation plant. Therefore, a dedicated pre-impurity removal mechanism based on the roller screen raw coal separation process is proposed. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a pre-impurity removal mechanism based on the raw coal sorting process of roller screens. It has the advantage of pre-removing impurities before screening, reducing the impact of impurities on subsequent screening, and solving the problem that impurities can easily cause pipeline blockages and equipment jams when they accompany raw coal into the belt conveyor system and subsequent coal preparation processes.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a pre-removal mechanism for raw coal sorting based on a roller screen, comprising a housing, a support frame disposed at the bottom of the housing, a baffle disposed on one side of the housing, a conveyor belt disposed on the inner wall of the housing, and a removal mechanism disposed on the inner wall of the housing. The removal mechanism includes a shaft, a bushing, and a gearbox. The shaft is rotatably connected to the inner wall of the housing; the bushing is fitted onto the outer wall of the shaft, and the outer wall of the bushing is provided with hook teeth; the gearbox is fixed to one side of the housing, and a motor is disposed on the gearbox, the output end of which is connected to the shaft. The hook teeth have through slots and a groove at one end.

[0008] In the above scheme, raw materials are introduced from the top of housing one, and the motor drives the gearbox to work, which in turn drives shaft one to rotate on the inner wall of housing one. When shaft one rotates, it drives the bushing on the outer wall to rotate synchronously. The hook teeth on the bushing rotate with the bushing and continuously comb and hook the raw coal conveyed on the conveyor belt. Because the hook teeth have through grooves, the raw coal can be reduced from sticking when hooking impurities, and the groove at one end can more effectively hold soft impurities such as wood and woven bags, as well as metal components such as anchor rods, to achieve the initial separation of impurities in the raw coal. At the same time, the conveyor belt continues to operate, transporting the raw coal that has undergone preliminary impurity removal to the next process.

[0009] Preferably, a second box is fixed to the top of the first box, a feed box is fixed to the top of the second box, and an opening and closing mechanism is provided on the top of the second box for controlling the discharge amount of the second box. The opening and closing mechanism includes a third baffle and a second shaft. The third baffle is slidably connected to the top of the second box. The second shaft is rotatably connected to the inner sidewall of the first box, and a first gear is fixed to the outer sidewall of the second shaft. The first gear meshes with the third baffle.

[0010] With the above scheme, after the material is introduced into the feed box, the user can control the output of the feed box to adapt to different raw coal processing needs by controlling the opening and closing mechanism. Specifically, when it is necessary to adjust the output of box two, the drive shaft two can be rotated on the inner wall of box one. The rotation of shaft two drives gear one fixed on its outer wall to rotate synchronously. Since gear one meshes with baffle three slidably connected to the top of box two, the rotation of gear one will drive baffle three to slide along the top of box two, thereby changing the area of ​​baffle three blocking the discharge port of box two, and achieving precise control of the output. For example, when baffle three slides away from the discharge port, the opening area of ​​the discharge port increases, and the output increases; conversely, when baffle three slides closer to the discharge port, the opening area of ​​the discharge port decreases, and the output decreases accordingly.

[0011] Preferably, a transmission box is fixed to one side of the housing, and a transmission mechanism is fixed to the transmission box. The rotation of the shaft 1 drives the transmission mechanism to work, causing the transmission mechanism to drive the two shafts 2 to rotate. The transmission mechanism includes a synchronous pulley 2, a gear 4, and a synchronous pulley 1. The synchronous pulley 2 is fixed to the outer wall of one of the shafts 2; the gear 4 is fixed to the outer wall of the other shaft 2; the synchronous pulley 1 is fixed to the outer wall of the shaft 1. A shaft 3 is rotatably connected to the inner wall of the housing 1. A synchronous pulley 3 and a synchronous pulley 4 are fixed to the shaft 3. The synchronous pulleys 2, 1, and 3 are connected by a synchronous belt 1. A shaft 4 is rotatably connected to the inner wall of the housing 1. A gear 3 and a synchronous pulley 5 are fixed to the outer wall of the shaft 4. The gear 3 meshes with the gear 4. The synchronous pulleys 4 and 5 are connected by a synchronous belt 2. A spring 1 is fixed between the baffle 3 and the housing 2.

[0012] With the above scheme, when the impurity removal mechanism is working, it drives the transmission mechanism. When shaft one rotates, the synchronous wheel one fixed on its outer wall rotates accordingly. Power is transmitted to synchronous wheel three on shaft three via synchronous belt one, causing shaft three to rotate synchronously. Synchronous wheel four on shaft three then drives synchronous wheel five on shaft four via synchronous belt two, thus rotating shaft four. Gear three on the outer wall of shaft four meshes with gear four on another shaft two, thereby driving shaft two to rotate. At the same time, under the transmission of synchronous belt one, shaft two containing synchronous wheel two also rotates synchronously. When the two shafts two rotate, they each drive gear one on their outer wall to rotate. Since gear one meshes with baffle three, and spring one is fixed between baffle three and housing two, under the drive of gear one and the elastic action of spring one, baffle three will slide back and forth on the top of housing two, realizing automatic adjustment of the discharge amount of housing two.

[0013] Preferably, the second housing is provided with an impact mechanism. The impact mechanism includes a frame and a gear. The frame is fixed to one side of the second housing; the gear is rotatably connected to the frame, and an impact part is fixed on the shaft of the gear. A baffle is slidably connected to the inner wall of the first housing, and a sliding rod is fixed to the top of the baffle. One end of the sliding rod is fixed to the second housing, and a spring is provided on the outer side of the sliding rod. The spring is fixed to both the sliding rod and the second housing.

[0014] With the above scheme, when the second baffle moves, it meshes with the second gear, driving the second gear to rotate on the frame. The shaft of the second gear rotates accordingly, thereby driving the impact part to move synchronously. When the second baffle slides upward, the second gear rotates clockwise, and the impact part lifts upward; when the second baffle slides downward under the elastic reset action of the third spring, the second gear rotates counterclockwise, and the impact part swings downward and impacts the outer wall of the housing.

[0015] Preferably, a plate is rotatably connected to one side of the housing, and a buffer mechanism is provided on the baffle. The buffer mechanism includes a support rod and a sliding rod, the support rod being fixed to the bottom of the plate; the sliding rod is slidably connected to the baffle, and a spring is fixed between the sliding rod and the baffle, with a push plate fixed to one end of the spring.

[0016] With the above scheme, when large pieces of coal or debris fall onto the plate, the plate rotates downwards under gravity. The support rod fixed at its bottom moves downwards and contacts the push plate, which in turn pushes the push plate along the axial direction of the slide rod. At this time, the slide rod slides on the baffle plate, and the spring fixed between the slide rod and the baffle plate is compressed. The elastic force generated by the spring buffers the movement of the push plate, thus slowing down the rotation speed of the plate and preventing large pieces of coal or debris from directly impacting and damaging it. After the large pieces of coal or debris are processed, the spring returns to its elastic deformation, pushing the push plate and support rod back to their original positions, ensuring proper reception and buffering of subsequent debris.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a special pre-impurity removal mechanism based on the raw coal separation process of roller screen, which has the following beneficial effects:

[0019] 1. This pre-removal mechanism based on the roller screen raw coal sorting process uses a removal mechanism installed inside the housing. A motor drives the shaft to rotate, causing hooks on the bushing to comb and pick up the raw coal on the conveyor belt. The grooves on the hooks reduce coal adhesion, while the recesses effectively engage soft debris and metal components, achieving preliminary separation of impurities and preventing them from directly entering subsequent screening stages, thus reducing the risk of jamming.

[0020] 2. This pre-removal mechanism based on the raw coal sorting process using a roller screen, when shaft one rotates, drives two shafts two to rotate via synchronous pulleys, synchronous belts, and gears. This causes gear one to drive baffle three to slide back and forth under the action of spring one, automatically adjusting the discharge rate of box two. This avoids overloading the conveyor belt or incomplete removal of impurities due to excessive feeding.

[0021] 3. The pre-impurity removal mechanism based on the raw coal sorting process of roller screen is equipped with an impact mechanism. When the second baffle moves, it meshes with the second gear, driving the impact part to periodically impact the large pieces of coal screened out, ensuring the smooth progress of the pre-impurity removal process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0023] Figure 2This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 ;

[0025] Figure 4 This is a schematic diagram of the hidden transmission box structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A;

[0027] Figure 6 This is a schematic diagram of the impurity removal mechanism in the present invention. Figure 1 ;

[0028] Figure 7 This is a schematic diagram of the impurity removal mechanism in the present invention. Figure 2 .

[0029] In the picture:

[0030] 110. Box body one; 120. Support frame; 130. Baffle one; 140. Box body two; 150. Feed box; 160. Transmission box; 170. Plate; 180. Baffle two;

[0031] 200. Conveyor belt;

[0032] 300. Impurity removal mechanism; 310. Motor; 320. Gearbox; 330. Shaft body one; 340. Bushing; 350. Hook tooth;

[0033] 400. Opening and closing mechanism; 410. Baffle three; 420. Shaft two; 430. Gear one;

[0034] 500. Impact mechanism; 510. Frame; 520. Gear II; 530. Spring I; 540. Impact part;

[0035] 600. Buffer mechanism; 610. Support rod; 620. Slide rod one; 630. Spring two; 640. Push plate;

[0036] 700. Transmission mechanism; 710. Synchronous pulley one; 720. Synchronous pulley two; 730. Synchronous pulley three; 740. Synchronous pulley four; 750. Gear three; 760. Synchronous pulley five; 770. Gear four; 780. Synchronous belt one; 790. Synchronous belt two;

[0037] 810. Spring 3; 820. Slide bar 2. Detailed Implementation

[0038] 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.

[0039] The underground mining environment in coal mines is complex. During the mining and underground transfer stages, raw coal often becomes mixed with soft impurities such as wood, rubber, and woven bags, as well as metal components such as anchor bolts, metal mesh, and steel ladders. These impurities, once carried by the raw coal into the belt conveyor system and subsequent coal preparation processes, can easily cause pipeline blockages and equipment malfunctions, leading not only to production interruptions but also affecting the stable operation of various automated equipment in the coal preparation plant. This application provides a dedicated pre-impurity removal mechanism based on a roller screen raw coal sorting process.

[0040] As attached Figure 1-7 As shown, the pre-removal machine for the raw coal separation process of the roller screen includes a box 110, a support frame 120, a baffle 130, a box 2 140, and a feed box 150. The box 110 is fixed to the top of the support frame 120, the baffle 130 is fixed to one side of the box 110, the box 2 140 is fixed to the top of the box 110, and the feed box 150 is fixed to the top of the box 2 140. The impurity removal mechanism 300 is rotatably connected to the inner wall of the box 110, and a conveyor belt 200 is provided on the inner wall of the box 110 near the lower part of the impurity removal mechanism 300.

[0041] Specifically, the raw material is introduced into the box 110 through the feed box 150. At this time, the rotation of the impurity removal mechanism 300 removes large pieces of coal and impurities from the right side of the raw material. The pre-screened coal is introduced onto the conveyor belt 200 through the impurity removal mechanism 300. The conveyor belt 200 then transports the pre-screened coal to the next device, thereby separating the impurities and coal and exporting them from two directions for subsequent separate processing.

[0042] In this embodiment, the impurity removal mechanism 300 includes a motor 310, a gearbox 320, a shaft 330, a bushing 340, and hook teeth 350. The gearbox 320 is fixed to one side of the shaft 310, and the motor 310 is fixed on the gearbox 320. The shaft 330 is rotatably connected to the inner side wall of the shaft 310. The output end of the motor 310 is connected to the shaft 330. The bushing 340 is fixed to the outer side wall of the shaft 330, and three hook teeth 350 are fixed on the bushing 340. The hook teeth 350 can slide on the bushing 340 and are fixed by bolts.

[0043] Specifically, the hook tooth 350 has a hollow structure and a groove is provided at the end of the hook tooth 350. During the rotation of the hook tooth 350, the coal can overflow onto the conveyor belt 200 through the hook tooth 350, or it can be discharged from the gap between the hook teeth 350. Through the rotation of the hook tooth 350, the groove on the hook tooth 350 can screen out flexible impurities in the raw material.

[0044] As attached Figure 1-7 As shown, an opening and closing mechanism 400 is slidably connected to the housing 140. The opening and closing mechanism 400 includes a baffle 410, a shaft 420, and a gear 430. Two opposing baffles 410 are slidably connected to the bottom of the housing 140. Two shafts 420 are rotatably connected to the inner side wall of the housing 110. A gear 430 is fixed to the outer side wall of the shaft 420. The gear 430 meshes with the bottom of the baffle 410. By controlling the rotation of the shaft 420, the gear 430 is driven to rotate, and the gear 430 meshes with the baffle 410, so that the baffle 410 is slidably connected to the housing 140, thereby opening the bottom of the housing 140 and controlling the output of raw materials.

[0045] In this embodiment, the outer wall of gear 430 is provided with an end tooth structure, and springs 530 are fixed on both sides of housing 140. Springs 530 are fixed to baffles 410. By controlling the rotation of shaft 420, gear 430 is rotated, so that the tooth structure on gear 430 meshes with baffles 410, and baffles 410 slides on housing 140. When the tooth structure does not mesh with baffles 410, the elastic reset of spring 530 causes baffles 410 to slide to the initial position on housing 140, thereby moving the two housings 140 toward their relative positions, sealing the bottom of housings 140, realizing intermittent material discharge, and reducing the overload of the pre-screening of the impurity removal mechanism 300.

[0046] Specifically, multiple channels can be opened on both baffles 3 410. When the two baffles 3 410 do not move in opposite directions, coal smaller than the channel size overflows to the impurity removal mechanism 300 and overflows from the impurity removal mechanism 300 to the conveyor belt 200. Large pieces of coal or impurities are blocked and can only overflow after the two baffles 3 410 are opened.

[0047] As attached Figure 1-7 As shown, a transmission box 160 is provided on one side of the housing 110. A transmission mechanism 700 is installed inside the transmission box 160. This transmission mechanism 700 can transmit the rotational force of the impurity removal mechanism 300 to the two baffles 410 to control their movement. In this way, when the impurity removal mechanism 300 rotates, it can drive the two baffles 410 to open and close, realizing the opening and closing action during the pre-screening process, thereby reducing the load on the impurity removal mechanism 300.

[0048] In this embodiment, the transmission mechanism 700 includes a first synchronous pulley 710, a second synchronous pulley 720, a third synchronous pulley 730, a fourth synchronous pulley 740, a third gear 750, a fifth synchronous pulley 760, a fourth gear 770, a first synchronous belt 780, and a second synchronous belt 790. One end of a first shaft 330 is fixed to the first synchronous pulley 710, one end of a second shaft 420 is fixed to the second synchronous pulley 720, and one end of another second shaft 420 is fixed to the fourth gear 770. One side of the housing 110 is rotatably connected to... There is a shaft three, and synchronous pulley three 730 and synchronous pulley four 740 are fixed on the outer side wall of shaft three. Shaft four is rotatably connected to one side of housing one 110. Gear three 750 and synchronous pulley five 760 are fixed on the outer side wall of shaft four. Gear three 750 and gear four 770 are meshed and connected. Synchronous pulley four 740 and synchronous pulley five 760 are connected by synchronous belt two 790. Synchronous pulley two 720, synchronous pulley four 740 and synchronous pulley one 710 are connected by synchronous belt one 780.

[0049] Specifically, when shaft 1 330 rotates counterclockwise, it drives synchronous pulley 1 710 to rotate. The synchronous belt 1 780 drives synchronous pulleys 2 720 and 3 730 to rotate counterclockwise. Shaft 3 on synchronous pulley 3 730 drives synchronous pulley 4 740 to rotate counterclockwise. The synchronous belt 2 790 drives synchronous pulley 5 760 to rotate counterclockwise. Shaft 4 on gear 3 750 drives gear 3 750 to rotate counterclockwise. At this time, gear 3 750 and gear 4 770 rotate, causing gear 4 770 to rotate clockwise, thereby realizing that the two baffles 3 410 move in opposite directions.

[0050] In this embodiment, the gearbox 320 includes gear five and gear six. Gear six is ​​fixed to the outer wall of one end of shaft one 330. Gear six is ​​located inside the gearbox 320. Gear six has a partial tooth structure on its outer wall. Gear five is rotatably connected inside the gearbox 320. Gear five is controlled to rotate by motor 310. When gear five rotates continuously and contacts the tooth structure on gear six, it drives gear six to rotate, causing shaft one 330 to start rotating. This achieves the intermittent rotation of hook tooth 350, thus successfully realizing the function of separating blocked debris.

[0051] In this embodiment, a baffle 180 is slidably connected to the inner wall of the housing 110. A sliding rod 820 is fixed to the top of the baffle 180 and is fixedly connected to the housing 140. The sliding rod 820 is sleeved on the outer side of the spring 810 and is fixed to both the housing 140 and the spring 810. One side of the baffle 180 has teeth that mesh with the gear 430. When the gear 430 is not engaged with the baffle 410, the baffle 410 is closed. At this time, the gear 430 engages with the baffle 180, lifting the baffle 180 and increasing the outlet flow to facilitate the discharge of pre-screened raw materials. When the gear 430 is not engaged with the baffle 180, the baffle 180 returns to its initial position under the action of the sliding rod 820 and its own weight. The sliding rod 820 is a telescopic rod.

[0052] As attached Figure 1-7 As shown, a buffer mechanism 600 is provided on the baffle 130, and a plate 170 is rotatably connected to one side of the box 110. When debris or large pieces of coal fall onto the plate 170, the impact force is weakened by the elastic reset of the buffer mechanism 600, and the impact force is converted into pushing the coal above the conveyor belt 200, thereby reducing the accumulation of coal on the conveyor belt 200.

[0053] Specifically, the buffer mechanism 600 includes a support rod 610, a slide rod 620, a spring 630, and a push plate 640. The slide rod 620 is slidably connected to the baffle 130. The support rod 610 is fixed to the bottom of the plate 170. The support rod 610 is slidably connected to one end of the slide rod 620. The spring 630 is fixed between the slide rod 620 and the baffle 130. The push plate 640 is fixed to the other end of the slide rod 620. When the plate 170 is pressed down, the support rod 610 presses the slide rod 620, which in turn drives the push plate 640 to move to one side, causing the push plate 640 to push the coal. The elastic reset of the spring 630 causes the plate 170 to rotate back to its initial position.

[0054] As attached Figure 1-7 As shown, an impact mechanism 500 is fixed to one side of the housing 140. This mechanism is used to crush large pieces of coal to reduce their impact on subsequent discharge equipment. The impact mechanism 500 includes a frame 510, a second gear 520, a first spring 530, and an impact part 540. The frame 510 is fixed to one side of the housing 140, and the second gear 520 is rotatably connected to the frame 510. The impact part 540 is fixed to the shaft of the second gear 520, and the second gear 520 is meshed with a third baffle 410. When the third baffle 410 moves outward, it meshes with the second gear 520, causing the impact part 540 to rotate outward. When the third baffle 410 moves to disengage from the first gear 430, the elastic restoring action of the first spring 530 causes the impact part 540 to quickly rotate back to its initial position, thereby crushing the coal pieces through the impact part 540.

[0055] 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 pre-impurity removal mechanism based on the raw coal separation process using a roller screen, characterized in that, The system includes a housing (110), a support frame (120) disposed at the bottom of the housing (110), a baffle (130) disposed on one side of the housing (110), a conveyor belt (200) disposed on the inner wall of the housing (110), and a cleaning mechanism (300) disposed on the inner wall of the housing (110). The cleaning mechanism (300) includes: Shaft 1 (330), which is rotatably connected to the inner side wall of housing 1 (110); A bushing (340) is fitted onto the outer side wall of the shaft body (330), and the outer side wall of the bushing (340) is provided with hook teeth (350). A gearbox (320) is fixed to one side of the housing (110), and a motor (310) is provided on the gearbox (320). The output end of the gearbox (320) is connected to the shaft (330).

2. The pre-impurity removal mechanism based on the raw coal separation process using a roller screen as described in claim 1, characterized in that: The hook tooth (350) has a through groove and a recess at one end.

3. The pre-impurity removal mechanism based on the raw coal separation process using a roller screen as described in claim 2, characterized in that: Box 1 (110) is fixed to the top of Box 2 (140), Box 2 (140) is fixed to the top of Box 2 (140) and a feed box (150) is fixed to the top of Box 2 (140). An opening and closing mechanism (400) is provided on the top of Box 2 (140) and the opening and closing mechanism (400) is used to control the discharge amount of Box 2 (140).

4. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 3, characterized in that: The opening and closing mechanism (400) includes: Baffle three (410), which is slidably connected to the top of the box body two (140); Shaft 2 (420) is rotatably connected to the inner wall of housing 1 (110), and gear 1 (430) is fixed to the outer wall of shaft 2 (420). Gear 1 (430) meshes with baffle 3 (410).

5. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 4, characterized in that: A transmission box (160) is fixed on one side of the housing (110), and a transmission mechanism (700) is fixed on the transmission box (160). The rotation of the shaft (330) drives the transmission mechanism (700) to work, so that the transmission mechanism (700) drives the two shafts (420) to rotate.

6. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 5, characterized in that: The transmission mechanism (700) includes: Synchronous pulley two (720), said synchronous pulley two (720) is fixed to the outer side wall of one of said shaft two (420); Gear four (770), said gear four (770) is fixed to the outer side wall of another said shaft two (420); Synchronous pulley one (710) is fixed to the outer wall of shaft one (330). Shaft three is rotatably connected to the inner wall of housing one (110). Synchronous pulley three (730) and synchronous pulley four (740) are fixed to shaft three. Synchronous pulley two (720), synchronous pulley one (710) and synchronous pulley three (730) are connected by synchronous belt one (780). Shaft four is rotatably connected to the inner wall of housing one (110). Gear three (750) and synchronous pulley five (760) are fixed to the outer wall of shaft four. Gear three (750) and gear four (770) are meshed. Synchronous pulley four (740) and synchronous pulley five (760) are connected by synchronous belt two (790). Spring one (530) is fixed between baffle three (410) and housing two (140).

7. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 6, characterized in that: The second box (140) is equipped with an impact mechanism (500).

8. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 7, characterized in that: The impact mechanism (500) includes: A frame (510) is fixed to one side of the second box (140); Gear 2 (520) is rotatably connected to the frame (510). An impact part (540) is fixed on the shaft where gear 2 (520) is located. A baffle 2 (180) is slidably connected to the inner side wall of the box 1 (110). A slide rod 2 (820) is fixed on the top of the baffle 2 (180). One end of the slide rod 2 (820) is fixed to the box 2 (140). A spring 3 (810) is provided on the outside of the slide rod 2 (820). The spring 3 (810) is fixed to the slide rod 2 (820) and the box 2 (140) respectively.

9. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 8, characterized in that: A plate (170) is rotatably connected to one side of the box body (110), and a buffer mechanism (600) is provided on the baffle (130).

10. A pre-impurity removal mechanism based on a roller screen raw coal separation process according to claim 9, characterized in that: The buffer mechanism (600) includes: A support rod (610) is fixed to the bottom of the plate (170); A sliding rod (620) is slidably connected to a baffle (130). A spring (630) is fixed between the sliding rod (620) and the baffle (130). A push plate (640) is fixed to one end of the spring (630).

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