Coal gangue multi-stage screening and circulating crushing device

Abstract

The present application relates to coal gangue crushing technical field, more specifically discloses a kind of coal gangue multistage screening and circulating crushing device, including shell assembly, the shell assembly includes shell main body, inside shell main body is sequentially provided with primary crushing cavity, screening cavity, secondary crushing cavity and tertiary crushing cavity from top to bottom, the inside of primary crushing cavity, screening cavity, secondary crushing cavity and tertiary crushing cavity is respectively equipped with jaw crushing structure, primary screening structure, secondary crushing box and tertiary crushing structure, the electric anti-blocking system integrated in the primary screening structure is provided in the present application, is advantageous to utilize electroosmosis effect and mechanical vibration synergistic effect, fundamentally solve the industry intractable problem that screen mesh adheres and blocks when high-wet coal gangue material is screened, ensure the continuity and stability of screening efficiency, reduce downtime cleaning time, improve equipment utilization.

Description

Technical Field

[0001] This invention relates to the field of coal gangue crushing technology, and more specifically to a multi-stage screening and circulating crushing device for coal gangue. Background Technology

[0002] Coal gangue is a coal mining waste material with a certain calorific value. It has uneven particle size, with the largest piece exceeding 450mm, and contains impurities such as iron parts, wires, stones, and ropes. The invented process involves two stages of crushing and screening. After being loaded into the hopper by a loader, the material first passes through a bar screen to remove large pieces larger than 300mm and iron parts. These are then crushed by a hydraulic hammer and returned to the hopper. The remaining material, with a particle size ≤300mm, passes through an iron separator to remove iron and separate the iron parts. It then enters a hammer crusher for further crushing, followed by screening by a linear vibrating screen. Coarse particles >3mm are returned for further crushing. The remaining material, with a particle size ≤3mm, is considered qualified coal gangue powder. The hammer crusher consists of a rotor, grate, liners, and a housing. The hammers are suspended on the rotor's hammer frame. The high-speed rotation of the rotor causes the hammers to rotate at high speed, impacting and grinding the raw material entering the crushing chamber, thus reducing the particle size. The discharge particle size is controlled by the screen holes or grate gaps at the discharge port.

[0003] After being crushed by a hammer crusher, the maximum particle size of coal gangue is reduced from 300mm to 10mm, resulting in a crushing ratio of 300 / 10 = 30 times. However, to achieve a conventional crushing ratio of 30 times, a three-stage crusher (coarse, medium, and fine) is required to crush the product to 10mm.

[0004] Existing coal gangue crushing and screening processes mostly adopt a "multi-stage crushing + multi-stage screening" process, but they still face several prominent challenges in actual production: First, coal gangue, especially under high humidity conditions, is prone to adhering to and clogging the screen mesh during screening, severely reducing screening efficiency and requiring frequent shutdowns for cleaning, which greatly affects the continuity and efficiency of production; Second, existing screening equipment lacks effective online anti-clogging and dehumidification methods, usually relying on traditional methods such as increasing vibration intensity or using heated screens, which have limited effectiveness and high energy consumption; Third, to achieve a larger crushing ratio, traditional production lines are usually composed of multiple independent devices connected in series, resulting in problems such as large footprint, multiple material transfers, numerous dust leakage points, high overall energy consumption, and high investment costs. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-stage screening and circulating crushing device for coal gangue, so as to solve the problems existing in the background art.

[0006] This invention provides the following technical solution: a multi-stage screening and circulating crushing device for coal gangue, comprising an outer shell assembly, the outer shell assembly comprising an outer shell body, the interior of the outer shell body having, from top to bottom, a primary crushing chamber, a screening chamber, a secondary crushing chamber, and a tertiary crushing chamber, respectively. A jaw crusher structure, a primary screening structure, a secondary crushing box, and a tertiary crushing structure are respectively installed inside the primary crushing chamber, the screening chamber, the secondary crushing chamber, and the tertiary crushing chamber. A mirror drive structure is installed on the outer shell body outside the jaw crusher structure. The primary screening structure is installed in conjunction with the mirror drive structure. The return port is located at the top of both sides of the outer shell body, with the bottom facing the discharge chute. The secondary crushing box is installed... The shock-absorbing support plates are fixed together to the central baffle. The secondary screening plate is located at the bottom of the secondary crushing box. The sorting plate is used to separate the materials screened by the secondary screening plate. The tertiary crushing chamber has a tertiary material inlet and an outlet on both sides. The outlet is in the same position as the circulation inlet. The tertiary material inlet is connected to the inner outlet. The central material hole is the passage for qualified materials and is connected to the screening chamber, the secondary crushing chamber, the inner outlet, and the tertiary material inlet. Qualified materials are allowed to enter the central material hole directly to avoid over-processing. The outer shell assembly has a circulation structure installed on both sides. The front of the outer shell assembly is fixedly installed with a drive motor. The drive gear at the bottom of the drive motor is meshed with the tertiary crushing structure.

[0007] Furthermore, the primary screening structure includes a screening box, which has a two-layer structure: an upper layer is a filter plate, and a lower layer is a guide plate. A flow guide plate is installed obliquely on the guide plate, and a discharge trough is opened at the bottom of the guide plate. A support rod is fixedly connected to the bottom center of the guide plate, and buffer springs are installed inside and outside the support rod. The outer buffer springs are sleeved together. A vibrating rod is fixedly connected to the side of the screening box, and a buffer spring is also sleeved on the outer side of the vibrating rod. A flow guide plate is fixedly connected to the bottom of the screening box, and a circular groove is opened in the middle of the flow guide plate. The bottom of the circular groove mates with the central material hole.

[0008] Furthermore, a pulse power controller is installed inside the support rod, which controls the power supply by the contraction of the buffer spring generated by vibration, and applies intermittent pulse current to the screening box during the screening process. The screen of the filter plate is made of conductive material and is electrically connected to the pulse power controller.

[0009] Furthermore, the shock-absorbing support plate has a hollow cavity structure with several ventilation micro-holes on its upper part. The cavity is connected to an external hot air source through a duct to form a ventilation and dehumidification system.

[0010] Furthermore, the mirror transmission structure includes two transmission rods, on which a crushing cam is fixedly connected. The crushing cam and the cam rod are installed in the same position. The two ends of the transmission rod are connected to the vibrating cam via belts. The vibrating cam is installed on the top of the vibrating rod. The vibrating cam consists of a cam and a pulley. The belt is installed on the pulley to drive the cam to rotate.

[0011] Furthermore, the filter plate of the screening box is the first electrode, and a second electrode plate parallel to it is set inside the filter plate. The positive and negative terminals of the pulsed DC power supply are respectively connected to the screening box and the second electrode plate.

[0012] Furthermore, the circulation structure includes a circulation shell and a transmission belt. A feeding plate is installed on the outside of the transmission belt, and a circulation outlet and a circulation inlet are opened on the side of the circulation shell. The unqualified coal gangue after the third-stage crushing is fed from the circulation inlet into the circulation outlet by the feeding plate.

[0013] Furthermore, the three-stage crushing structure includes a crushing ring, an external toothed ring fixedly connected to the outer side of the crushing ring, the external toothed ring meshing with a transmission gear, and multiple crushing balls fixedly connected to the inner side of the crushing ring, the crushing balls being used for three-stage crushing of coal gangue.

[0014] Furthermore, the inner discharge port is the inward passage for qualified materials, and the outer discharge port is the outward passage for unqualified materials. A sweeping plate is installed at the bottom of the three-stage crushing structure, which sweeps the material at the bottom of the three-stage crushing chamber to the outer discharge port.

[0015] The technical effects and advantages of this invention are as follows:

[0016] 1. This invention, by incorporating an integrated electro-anti-clogging system within the primary screening structure, effectively utilizes the synergistic effect of electroosmosis and mechanical vibration to fundamentally solve the industry-wide problem of screen adhesion and clogging during the screening of high-moisture coal gangue materials. This ensures the continuity and stability of screening efficiency, reduces downtime for cleaning, and improves equipment utilization.

[0017] 2. This invention, through the hot air channel set inside the shock-absorbing support plate, facilitates the in-situ drying of materials during screening using system waste heat or auxiliary heat sources, effectively reducing the surface humidity of the materials. This not only further avoids clogging in subsequent screening and crushing stages but also improves the flowability of materials and screening efficiency. Through the synergistic effect of "electric anti-clogging" and "thermal dehumidification," it achieves efficient and continuous processing of high-moisture and high-viscosity coal gangue raw materials. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 For the present invention Figure 1Schematic diagram of structure A in the middle.

[0020] Figure 3 This is a side sectional view of the overall structure of the present invention.

[0021] Figure 4 This is a front cross-sectional view of the overall structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the housing assembly structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the primary screening structure of the present invention.

[0024] Figure 7 This is a bottom view of the primary screening structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the three-stage crushing mechanism of the present invention.

[0026] The attached figures are labeled as follows: 1. Outer shell assembly; 101. Outer shell body; 102. Primary crushing chamber; 103. Screening chamber; 104. Secondary crushing chamber; 105. Central baffle; 106. Tertiary crushing chamber; 107. Sorting plate; 108. Inner discharge port; 109. Outer discharge port; 110. Return port; 111. Central material hole; 112. Tertiary material port; 2. Jaw crusher structure; 201. Crushing plate; 202. Cam rod; 3. Mirror transmission structure; 301. Transmission rod; 302. Crushing cam; 303. Belt; 304. Vibrating cam; 4. Primary crushing chamber. Screening structure; 401, Screening box; 402, Guide plate; 403, Vibrating rod; 404, Support rod; 405, Discharge trough; 406, Buffer spring; 407, Guide inclined plate; 5, Secondary crushing box; 6, Shock-absorbing support plate; 7, Secondary screening plate; 8, Tertiary crushing structure; 801, Crushing ring; 802, External toothed ring; 803, Crushing ball; 9, Drive motor; 10, Drive gear; 11, Circulation structure; 1101, Circulation shell; 1102, Drive belt; 1103, Feeding plate; 1104, Circulation outlet; 1105, Circulation inlet. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The multi-stage screening and circulating crushing device for coal gangue involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figure 1 and Figure 2This invention provides a multi-stage screening and circulating crushing device for coal gangue, including an outer shell assembly 1. The outer shell assembly 1 includes an outer shell body 101. The interior of the outer shell body 101, from top to bottom, is provided with a primary crushing chamber 102, a screening chamber 103, a secondary crushing chamber 104, and a tertiary crushing chamber 106. A jaw crusher structure 2, a primary screening structure 4, a secondary crushing box 5, and a tertiary crushing structure 8 are respectively installed inside the primary crushing chamber 102, screening chamber 103, secondary crushing chamber 104, and tertiary crushing chamber 106. A mirror drive structure 3 is installed on the outer shell body 101 outside the jaw crusher structure 2. The primary screening structure 4 is installed in conjunction with the mirror drive structure 3. Return ports 110 are located at the top of both sides of the outer shell body 101, with the bottom facing the discharge chute 405. The secondary crushing box 5 is mounted on a shock-absorbing support plate 6. The upper part is fixed on the central baffle 105. The secondary screening plate 7 is located at the bottom of the secondary crushing box 5. The sorting plate 107 is used to separate the material screened by the secondary screening plate 7. The tertiary crushing chamber 106 has a tertiary material inlet 112 and an outlet 109 on both sides. The outlet 109 is in the same position as the circulation inlet 1105. The tertiary material inlet 112 is connected to the inner outlet 108. The central material hole 111 is the passage for qualified materials. It is connected to the screening chamber 103, the secondary crushing chamber 104, the inner outlet 108 and the tertiary material inlet 112. Qualified materials are allowed to directly enter the central material hole 111 to avoid over-processing. The outer shell assembly 1 has a circulation structure 11 installed on both sides. The outer shell assembly 1 has a drive motor 9 fixedly installed on the front. The drive gear 10 at the bottom of the drive motor 9 is meshed with the tertiary crushing structure 8.

[0029] In this embodiment, it should be specifically explained that: the inner discharge port 108 is the inward passage for qualified materials, the outer discharge port 109 is the outward passage for unqualified materials, and a sweeping plate is installed at the bottom of the three-stage crushing structure 8. The sweeping plate sweeps the material at the bottom of the three-stage crushing chamber 106 into the outer discharge port 109.

[0030] The main difference between this embodiment and the prior art is that this embodiment achieves full crushing of coal gangue through multi-stage crushing and screening, and directly discharges the qualified material after multi-stage crushing to avoid over-processing. At the same time, it uses a highly integrated electro-osmosis anti-clogging system and ventilation and dehumidification system, specifically the jaw crusher structure 2, the primary screening structure 4, the secondary crushing box 5, the shock-absorbing support plate 6, and the tertiary crushing structure 8.

[0031] The above structure is the main structure of this embodiment, which solves the problem of filter clogging and cleaning difficulty caused by the high moisture content of coal gangue. The circulation structure 11 is an existing structure, and the specific structure and driving method of the circulation structure 11 will not be described in detail in this embodiment.

[0032] Reference Figure 2The mirror transmission structure 3 includes two transmission rods 301. A crushing cam 302 is fixedly connected to the transmission rod 301. The crushing cam 302 is installed in the same position as the cam rod 202. The two ends of the transmission rod 301 are connected to the vibration cam 304 through the belt 303. The vibration cam 304 is installed on the top of the vibration rod 403.

[0033] In this embodiment, it should be specifically explained that the vibrating cam 304 is composed of a cam and a pulley. The belt 303 is installed on the pulley to drive the cam to rotate. Under the action of the belt 303, the vibrating cam 304 pushes the vibrating rod 403 to move up and down, so that the coal gangue is screened under vibration.

[0034] Reference Figure 6-7 The primary screening structure 4 includes a screening box 401, which has a two-layer structure. The upper layer is a filter plate, and the lower layer is a guide plate. A guide plate 402 is installed obliquely on the guide plate. A discharge trough 405 is opened at the bottom of the guide plate 402. A support rod 404 is fixedly connected to the middle of the bottom of the guide plate. Buffer springs 406 are installed inside and outside the support rod 404. The buffer springs 406 on the outside are sleeved. A vibrating rod 403 is fixedly connected to the side of the screening box 401. Buffer springs 406 are also sleeved on the outside of the vibrating rod 403. A guide plate 407 is fixedly connected to the bottom of the screening box 401. A circular groove is opened in the middle of the guide plate 407. The bottom of the circular groove matches the central material hole 111.

[0035] A displacement sensor is installed inside the support rod 404 to detect the compression deformation of the buffer spring 406 in real time. The pulse power controller is connected to the displacement sensor and has a pre-set deformation-current correspondence table (for example, the output current increases by 0.1A for every 1mm increase in deformation). The controller outputs a corresponding pulse current based on the received deformation signal.

[0036] In this embodiment, it should be specifically explained that: a pulse power controller is installed inside the support rod 404, and the power supply is controlled by the contraction of the buffer spring 406 generated by vibration. During the screening process, an intermittent pulse current is applied to the screening box 401. The screen of the filter plate is made of conductive material and is electrically connected to the pulse power controller. The filter plate of the screening box 401 is the first electrode, and a second electrode plate parallel to it is set inside the filter plate. The positive and negative terminals of the pulse DC power supply are respectively connected to the screening box 401 and the second electrode plate.

[0037] This invention integrates an electro-osmotic anti-clogging system within the primary screening structure 4. A stainless steel screen serves as one electrode, with a metal plate positioned parallel to it approximately 50-100mm below as the second electrode. Power is supplied by an adjustable pulsed DC power supply, with operating parameters set, for example, to a voltage of 100-500V and a pulse frequency of 1-5Hz. When energized, the electric field formed between the two electrodes acts on the polar water molecules in the wet material, forcing them to move directionally using the electro-osmotic effect. This disrupts the 'liquid bridge' adhesion between the material and the screen, as well as between material particles, from within. This electro-cleaning process is synchronized with the mechanical vibration of the screen. The mechanical vibration dislodges the material that has been 'unbound' by the electro-osmotic effect, achieving efficient and continuous self-cleaning and completely solving the problem of screen clogging.

[0038] Reference Figure 3 The shock-absorbing support plate 6 has a hollow cavity structure with several ventilation micro-holes on its upper part. The cavity is connected to an external hot air source through a duct to form a ventilation and dehumidification system. When the system is running, hot air is blown into the hollow shock-absorbing support plate 6 and seeps out evenly from the numerous micro-holes on its upper part, continuously blowing onto the material being screened on the secondary screening plate 7 to evaporate the surface moisture and keep the material loose and dry.

[0039] In this embodiment, it should be specifically noted that the external hot air source is a heat collection cover installed around the drive motor 9, and the heat collection cover is connected to the cavity of the shock-absorbing support plate 6 through a duct.

[0040] The shock-absorbing support plate 6 is a composite component that combines shock absorption support and ventilation and dehumidification functions. Its interior is hollow and its surface is covered with micropores. It is connected to the hot air collection hood around the crusher drive motor 9 through a pipe. This structure helps to reduce the moisture content of the material and effectively solves the problems of low screening efficiency, material adhesion, and equipment blockage caused by the high moisture content of coal gangue.

[0041] Reference Figure 2 The circulation structure 11 includes a circulation shell 1101 and a transmission belt 1102. A feeding plate 1103 is installed on the outside of the transmission belt 1102. A circulation outlet 1104 and a circulation inlet 1105 are opened on the side of the circulation shell 1101. The unqualified coal gangue after the third-stage crushing is fed from the circulation inlet 1105 into the circulation outlet 1104 by the feeding plate 1103 and enters the return port 110.

[0042] In this embodiment, it should be specifically explained that the rotation of the feeding plate 1103 causes the unqualified crushed stone to re-enter the return port 110 and fall into the secondary crushing box 5 for further cyclic crushing.

[0043] Reference Figure 8The three-stage crushing structure 8 includes a crushing ring 801, an external toothed ring 802 fixedly connected to the outer side of the crushing ring 801, the external toothed ring 802 meshing with the transmission gear 10, and multiple crushing balls 803 fixedly connected to the inner side of the crushing ring 801. The crushing balls 803 are used for three-stage crushing of coal gangue.

[0044] In this embodiment, it should be specifically explained that: the transmission motor 9 drives the three-stage crushing structure 8 to rotate through the transmission gear 10, and the crushing ball 803 crushes the coal gangue inside the three-stage crushing chamber 106 again. The crushed stone after the third crushing enters the inner discharge port 108 through the three-stage feed port 112.

[0045] Working principle of the invention:

[0046] The main problem solved by this embodiment is to achieve full crushing of coal gangue through multi-stage crushing and screening, while directly discharging qualified material after multi-stage crushing to avoid over-processing. At the same time, the highly integrated electro-osmosis anti-clogging system and ventilation and dehumidification system solve the problem of filter clogging and cleaning difficulty caused by the high humidity of coal gangue.

[0047] The specific steps are as follows:

[0048] Large-diameter coal gangue is placed on top of the outer casing assembly 1 and enters the primary crushing chamber 102 under gravity. The motor drives the mirror transmission structure 3 to rotate. The rotation of the mirror transmission structure 3 causes the cam rod 202 to drive the crushing plate 201 to reciprocate, performing primary crushing of the coal gangue. The crushed coal gangue falls onto the screening box 401. As the mirror transmission structure 3 continues to rotate, the vibrating cam 304, under the action of the belt 303, pushes the vibrating rod 403 to move up and down, causing the coal gangue to... Screening is completed under vibration. Larger diameter coal gangue slides to both sides and enters the secondary crushing box 5 from the discharge chute 405 under the guidance of the guide plate 402. As the secondary crushing in the secondary crushing box 5 ends, the coal gangue falls from the bottom of the secondary crushing box 5 onto the secondary screening plate 7 for secondary screening. The qualified crushed stone from the secondary screening moves towards the center and enters the inner discharge port 108 under the action of the sorting plate 107, while the unqualified crushed stone moves outward and enters the tertiary crushing chamber 106.

[0049] At this time, the drive motor 9 is started. Since the drive gear 10 is meshed with the external gear ring 802, the drive motor 9 drives the three-stage crushing structure 8 to rotate through the drive gear 10. The crushing ball 803 crushes the coal gangue inside the three-stage crushing chamber 106 again. The crushed stone after the third crushing enters the inner discharge port 108 through the three-stage feed port 112. The crushed stone that is still not qualified is cleaned into the outer discharge port 109 by the sweeping plate at the bottom of the crushing ring 801. The feed plate 1103 rotates so that the unqualified crushed stone re-enters the return port 110 and falls into the secondary crushing box 5 for another cycle of crushing.

[0050] Meanwhile, the qualified crushed stone after being screened by the primary screening structure 4 enters the bottom of the primary screening structure 4 through the filter screen of the primary screening structure 4. After being guided by the guide plate 407, it enters the central material hole 111 and is directly discharged to the inner discharge port 108, where it merges with the crushed stone after being screened for the second time on the secondary screening plate 7. At the same time, when the primary screening structure 4 is lowered by the mirror transmission structure 3, the pulse power controller supplies power to the first and second electrodes. The generated electric field acts on the polar water molecules in the wet material at the filter hole, destroying their adhesion and causing them to fall under the combined action of vibration dynamics and pulse electricity, effectively solving the problem of screen clogging.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage screening and circulating crushing device for coal gangue, comprising an outer shell assembly (1), a primary screening structure (4), and a shock-absorbing support plate (6), characterized in that: The outer shell assembly (1) includes an outer shell body (101). The inner shell body (101) is provided with a primary crushing chamber (102), a screening chamber (103), a secondary crushing chamber (104) and a tertiary crushing chamber (106) from top to bottom. The primary crushing chamber (102), the screening chamber (103), the secondary crushing chamber (104) and the tertiary crushing chamber (106) are respectively equipped with a jaw crusher structure (2), a primary screening structure (4), a secondary crushing box (5) and a tertiary crushing structure (8). The primary screening structure (4) includes a support rod (404) and a screening box (401). The screening box (401) has a two-layer structure, with a filter plate on the upper layer and a guide plate on the lower layer. A guide plate (402) is installed on the guide plate at an incline. A discharge trough (405) is opened at the bottom of the guide plate (402). A support rod (404) is fixedly connected to the middle of the bottom of the guide plate. Buffer springs (406) are installed inside and outside the support rod (404). The buffer springs (406) on the outside are sleeved. A vibrating rod (403) is fixedly connected to the side of the screening box (401). Buffer springs (406) are still sleeved on the outside of the vibrating rod (403). A guide plate (407) is fixedly connected to the bottom of the screening box (401). A circular groove is opened in the middle of the guide plate (407). The bottom of the circular groove is matched with the central material hole (111). The inner side of the support rod (404) is equipped with a pulse power controller and a displacement sensor. The displacement sensor is used to detect the compression deformation of the buffer spring (406) caused by the screening vibration in real time. The pulse power controller is connected to the displacement sensor signal and controls the power supply according to the amount of compression deformation. During the screening process, an intermittent pulse current is applied to the screening box (401). The screen of the filter plate is made of conductive material and serves as the first electrode. A second electrode plate is arranged parallel to the inner side of the filter plate. The positive and negative poles of the pulse DC power supply are electrically connected to the screening box (401) and the second electrode plate, respectively. When the power is applied, an electric field is formed between the two poles. The electroosmotic effect is used to destroy the adhesion force of the 'liquid bridge' between the wet material and the screen and between the material particles. The screen is prevented from clogging in conjunction with the mechanical vibration. The shock-absorbing support plate (6) is a hollow cavity structure with several ventilation micro-holes on its upper part. The cavity is connected to an external hot air source through a duct to form a ventilation and dehumidification system.

2. The multi-stage screening and circulating crushing device for coal gangue according to claim 1, characterized in that: The outer shell (101) is located on the outside of the jaw crusher structure (2) and a mirror drive structure (3) is installed. The primary screening structure (4) is installed in conjunction with the mirror drive structure (3). The return port (110) is opened on the top of both sides of the outer shell (101) and the bottom faces the discharge trough (405). The secondary crushing box (5) is installed on the shock-absorbing support plate (6) and fixed on the central baffle (105). The secondary screening plate (7) is located at the bottom of the secondary crushing box (5). The sorting plate (107) is used to separate the material screened by the secondary screening plate (7). The tertiary crushing chamber (106) is provided with tertiary material inlets (110) on both sides. 12) The third-stage material outlet (112) is connected to the inner material outlet (108) and the outer material outlet (109). The central material hole (111) is a qualified material passage and is connected to the screening chamber (103), the secondary crushing chamber (104), the inner material outlet (108) and the third-stage material outlet (112). First-stage and second-stage qualified materials are allowed to directly enter the central material hole (111) to avoid over-processing. The outer shell assembly (1) is equipped with a circulation structure (11) on both sides. The outer shell assembly (1) is fixedly installed with a drive motor (9). The drive gear (10) at the bottom of the drive motor (9) is meshed with the third-stage crushing structure (8).

3. The multi-stage screening and circulating crushing device for coal gangue according to claim 2, characterized in that: The mirror transmission structure (3) includes two transmission rods (301). A crushing cam (302) is fixedly connected to the transmission rod (301). The crushing cam (302) corresponds to the installation position of the cam rod (202) of the jaw crusher structure (2). The two ends of the transmission rod (301) are connected to the vibration cam (304) through the belt (303). The vibration cam (304) is installed on the top of the vibration rod (403). The vibration cam (304) is composed of a cam and a pulley. The belt (303) is installed on the pulley to drive the cam to rotate.

4. The multi-stage screening and circulating crushing device for coal gangue according to claim 3, characterized in that: The circulation structure (11) includes a circulation shell (1101) and a transmission belt (1102). A feeding plate (1103) is installed on the outside of the transmission belt (1102). A circulation outlet (1104) and a circulation inlet (1105) are opened on the side of the circulation shell (1101). The unqualified coal gangue after the third-stage crushing is fed from the circulation inlet (1105) into the circulation outlet (1104) by the feeding plate (1103). The outgoing discharge port (109) is in the same position as the circulation inlet (1105) and then returns to the secondary crushing box (5) through the return port (110) of the shell body.

5. The multi-stage screening and circulating crushing device for coal gangue according to claim 4, characterized in that: The three-stage crushing structure (8) includes a crushing ring (801), an external toothed ring (802) is fixedly connected to the outer side of the crushing ring (801), the external toothed ring (802) is meshed with the transmission gear (10), and multiple crushing balls (803) are fixedly connected to the inner side of the crushing ring (801). The crushing balls (803) are used to crush coal gangue in three stages.

6. The multi-stage screening and circulating crushing device for coal gangue according to claim 5, characterized in that: The inner discharge port (108) is the inward passage for qualified materials, and the outer discharge port (109) is the outward passage for unqualified materials. The bottom of the three-stage crushing structure (8) is equipped with a sweeping plate, which sweeps the material at the bottom of the three-stage crushing chamber (106) into the outer discharge port (109).

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