Stepped coal crushing device

Abstract

The utility model relates to the technical field of coal chemical production accessory equipment, in particular to a stepped coal crushing device which comprises a frame body, the frame body comprises a first-stage stepped support, a second-stage stepped support and a third-stage stepped support which are arranged in a stepped mode from top to bottom, a first crushing device is arranged on the first-stage stepped support, and a second crushing device is arranged on the second-stage stepped support. A first crushing device is arranged on the first-stage stepped support, a screening component is arranged below the first crushing device, a second crushing device is arranged on the second-stage stepped support, a screening component is arranged below the second crushing device, a third crushing device is arranged on the third-stage stepped support, and the first crushing device, the second crushing device and the third crushing device are extrusion wheel set devices driven by gears. The extrusion rollers of the first crushing device are provided with protruding spiral extrusion strips, the extrusion rollers of the second crushing device are provided with longitudinal extrusion ribs in the circumferential direction of a center shaft, and the extrusion rollers of the third crushing device are formed by alternately combining integrated combination wheels composed of circular ring wheels and toothed ring wheels.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary equipment for coal chemical production, in particular to a stepped coal crushing device. Background Art

[0002] Coal crushers play an important role in coal chemical production. Coal crushers are mainly used for coal crushing. After the coal is crushed, it is screened by the screen mechanism to obtain finer coal. When some existing models of coal crushers are used, due to the large influx of coal blocks from the feed port, the contact between the coal blocks and the extrusion rollers is uneven, resulting in excessive local extrusion time of the extrusion rollers, increased wear of the extrusion rollers, and the transportation of large particles of coal blocks to the next station, which will affect the production equipment and production efficiency of the next station. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a stepped coal crushing device to achieve graded extrusion crushing, ensure uniform feeding of coal blocks, ensure stable particle size of coal block crushing, and improve production efficiency.

[0004] The technical solution adopted by the utility model is:

[0005] A stepped coal crushing device comprises a frame, which comprises a first-level stepped support, a second-level stepped support and a third-level stepped support, wherein the first-level stepped support, the second-level stepped support and the third-level stepped support are arranged from top to bottom in a stepped shape, a first-level mounting platform is arranged on the side of the first-level stepped support, a second-level mounting platform is arranged on the side of the second-level stepped support, a third-level mounting platform is arranged on the side of the third-level stepped support, a first mounting cover is arranged in the first-level stepped support, a first crushing device is arranged in the first mounting cover, the first crushing device is fixedly arranged on the first-level mounting platform, a screening component is arranged below the first crushing device, a second mounting cover is arranged in the second-level stepped support, a second crushing device is arranged in the second mounting cover, the second crushing device is fixedly arranged on the second mounting platform, a screening component is arranged below the second crushing device, a third mounting cover is arranged in the third-level stepped support, a third crushing device is arranged in the third mounting cover, the third crushing device is fixedly arranged on the third mounting platform, and the first crushing device, the second crushing device and the third crushing device are gear-driven extrusion wheel group devices.

[0006] Furthermore, the first crushing device includes a first extrusion roller group and a second extrusion roller group, the first extrusion roller group and the second extrusion roller group are driven by gear meshing, and the extrusion rollers of the first extrusion roller group and the second extrusion roller group are provided with protruding spiral extrusion strips, a first extrusion plate is provided on the side of the first extrusion roller group, and the first extrusion plate is fixedly arranged on the side wall of the first mounting cover, a second extrusion plate is provided on the side of the second extrusion roller group, and the second extrusion plate is fixedly arranged on the side wall of the first mounting cover, the first extrusion plate and the second extrusion plate are triangular structures, and extrusion ridges are arranged on the surfaces facing the first extrusion roller group and the second extrusion roller group, a screening component is arranged below the first extrusion roller group and the second extrusion roller group, and the screening component includes a first screen plate, the first screen plate is arranged in a downward inclined shape, and a hollow through groove is arranged on it.

[0007] Furthermore, the third crushing device includes a fifth extrusion roller group and a sixth extrusion roller group, which are driven by gear meshing, and an extrusion screen plate is arranged below the fifth extrusion roller group and the sixth extrusion roller group. The interior of the extrusion screen plate is a groove structure, and the groove walls on both sides are inclined downward, and extrusion ridges are arranged on the groove walls. A screen groove is penetrated through the bottom end surface of the extrusion screen plate, and the extrusion rollers arranged on the fifth extrusion roller group and the sixth extrusion roller group are composed of an integrated combination wheel that is alternately combined, and the integrated combination wheel includes a circular ring wheel and a gear ring wheel.

[0008] Furthermore, the second crushing device comprises a third extrusion roller group and a fourth extrusion roller group, and the extrusion rollers of the third extrusion roller group and the fourth extrusion roller group are provided with longitudinal extrusion ridges along the circumference of the central axis.

[0009] Furthermore, the screening component is a floating screening device, which includes a second screen plate assembly and a floating seat assembly. The second screen plate assembly includes a second screen plate. A rotating shaft hinge is provided at one end of the second screen plate, and the rotating shaft hinge is fixedly arranged on the side wall of the first mounting cover. The other end of the second screen plate is tilted downward, and a floating seat assembly is arranged below. The floating seat assembly includes a mounting support plate, which is an L-shaped bracket. The vertical plate is fixedly arranged on the inner wall of the first mounting cover, and a plurality of floating seats are arranged on the horizontal plate.

[0010] Furthermore, the floating seat includes a support, an upper baffle ring is arranged on the top of the support, a lower baffle plate is arranged on the bottom, a circular through hole is arranged in the support, a floating pin is passed through the circular through hole, the top and bottom of the floating pin pass through the upper baffle ring and the lower baffle plate, a spring is sleeved on the floating pin, and the spring is arranged in the circular through hole of the support, and a ball head is also arranged on the floating pin.

[0011] Furthermore, a plurality of sieve hole slots are provided through the second sieve plate, and the second sieve plate is also provided with raised strips, which are perpendicular to the sieve hole slots.

[0012] Furthermore, a first-level inlet is arranged at the top of the first mounting cover, a first-level first outlet is arranged at the bottom, a first-level second outlet is arranged at the side wall, the first-level second outlet is arranged at the side of the second mounting cover, a second-level first outlet is arranged at the bottom port of the second mounting cover, a second-level inlet is arranged at one side of the side wall, the second-level inlet is arranged at one side of the first mounting cover, and is arranged to match and correspond to the first-level second outlet, a second-level second outlet is arranged at the other side wall of the second mounting cover, and the second-level second outlet is arranged at the side of the third mounting cover; a third-level outlet is arranged at the bottom port of the third mounting cover, a third-level inlet is arranged at one side wall, the third-level inlet is arranged at the side of the second mounting cover, and is arranged to match and correspond to the second-level second outlet.

[0013] Beneficial effects of the utility model:

[0014] The utility model discloses a step coal crushing device, comprising a frame, the frame comprising a first step support, a second step support, and a third step support arranged in a step shape from top to bottom, a first crushing device is arranged on the first step support, a screening component is arranged below the first crushing device, a second crushing device is arranged on the second step support, a screening component is arranged below the second crushing device, and a third crushing device is arranged on the third step support, and the first crushing device, the second crushing device, and the third crushing device are gear-driven extrusion wheel group devices. The extrusion roller of the first crushing device is provided with a protruding spiral extrusion bar, which can extrude the coal block and also perform spiral stirring to make the material uniform, the extrusion roller of the second crushing device is provided with a longitudinal extrusion ridge along the circumference of the central axis, and the longitudinal extrusion ridge is provided so that the coal block can be fully extruded and crushed, and the extrusion roller of the third crushing device is an integral combination wheel composed of a circular ring wheel and a toothed ring wheel, which are alternately combined, and the circular ring wheel and the toothed ring wheel are alternately installed and docked, so that the coal block is extruded more fully. A floating screen plate device is also provided in this device to make the screening of the coal block more sufficient. The device has a simple structure, is easy to operate, and has sufficient three-stage crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the following specifically cites preferred embodiments and cooperates with the attached drawings, but the embodiments in the drawings do not constitute any limitation of the present invention. For ordinary technicians in this field, other drawings can be obtained according to the following drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure;

[0017] Figure 2 This is a schematic diagram of the installation cover entrance and exit structure;

[0018] Figure 3 This is a schematic diagram of the internal structure of the whole structure;

[0019] Figure 4 It is a schematic diagram of the structure of the extruded screen plate;

[0020] Figure 5 It is a schematic diagram of the extrusion wheel structure;

[0021] Figure 6 This is a structural schematic diagram of a second embodiment of a screening device;

[0022] Figure 7 is a schematic structural diagram of the second sieve plate assembly;

[0023] Figure 8 Schematic diagram of the floating seat assembly structure.

[0024] In the figure: 1-frame, 101-first-level step bracket, 102-second-level step bracket, 103-third-level step bracket, 104-first-level mounting platform, 105-second-level mounting platform, 106-third-level mounting platform, 2-first mounting cover, 201-first-level entrance, 202-first-level exit, 203-first-level exit, 3-second-level installation cover, 301-second-level entrance, 302-second-level first exit, 303-second-level second exit, 4-third-level installation cover, 401-third-level entrance, 402-third-level exit,

[0025] 5-first crushing device, 501-first squeezing roller set, 502-second squeezing roller set, 503-first motor, 504-first gear, 505-second gear, 506-first squeezing plate, 507-second squeezing plate, 508-first bearing seat,

[0026] 6-second crushing device, 601-third extrusion roller set, 602-fourth extrusion roller set, 603-second motor, 604-third gear, 605-fourth gear, 606-third extrusion plate, 607-fourth extrusion plate, 608-second bearing seat,

[0027] 7-third crushing device, 701-fifth extrusion roller wheel group, 702-sixth extrusion roller wheel group, 703-third motor, 704-fifth gear, 705-sixth gear, 706-extrusion screen plate, 7061-screen slot, 707-third bearing seat, 708-integrated combination wheel, 7081-circular ring wheel, 7082-toothed ring wheel,

[0028] 8-second sieve plate assembly, 801-second sieve plate, 8011-sieve hole slot, 8012-raised strip, 802-rotating shaft hinge,

[0029] 9-floating seat assembly, 901-mounting support plate, 902-floating seat, 9021-support, 9022-floating pin, 9023-upper retaining ring, 9024-lower retaining plate, 9025-spring, 9026-ball head,

[0030] 10-First sieve plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0033] like Figure 1 , Figure 2 , Figure 3 As shown, a stepped coal crushing device includes a frame 1, which is a welded frame and is stepped from top to bottom. The frame 1 of this embodiment is provided with three stepped brackets, which are respectively: a first-level stepped bracket 101, a second-level stepped bracket 102, and a third-level stepped bracket 103 from top to bottom. A first-level mounting platform 104 is provided on the side of the first-level stepped bracket 101, a second-level mounting platform 105 is provided on the side of the second-level stepped bracket 102, and a third-level mounting platform 106 is provided on the side of the third-level stepped bracket 103. A first mounting cover 2 is provided in the first-level stepped bracket 101, a second mounting cover 3 is provided in the second-level stepped bracket 102, and a third mounting cover 4 is provided in the third-level stepped bracket 103. A first crushing device 5 is arranged in the first installation cover 2, and the first crushing device 5 is fixedly arranged on the first-level installation platform 104, and a screening component is arranged below the first crushing device 5; a second crushing device 6 is arranged in the second installation cover 3, and the second crushing device 6 is fixedly arranged on the second-level installation platform 105, and a screening component is arranged below the second crushing device 6; a third crushing device 7 is arranged in the third installation cover 4, and the third crushing device 7 is fixedly arranged on the third-level installation platform 106.

[0034] like Figure 2As shown, the first mounting cover 2 is vertically arranged in the first-stage step bracket 101, the first-stage inlet 201 is arranged at the top of the first mounting cover 2, the first-stage first outlet 202 is arranged at the bottom, the first-stage second outlet 203 is arranged at the side wall, and the first-stage second outlet 203 is arranged at the side of the second mounting cover 3. The second mounting cover 3 is vertically arranged in the second-stage step bracket 102, the bottom port is provided with a second-stage first outlet 302, one side wall is provided with a second-stage inlet 301, the second-stage inlet 301 is arranged at one side of the first mounting cover 2, and is arranged to match and correspond to the first-stage second outlet 203, the other side wall is provided with a second-stage second outlet 303, and the second-stage second outlet 303 is arranged at the side of the third mounting cover 4. The third mounting cover 4 is vertically arranged in the third-stage step bracket 103, the bottom port is provided with a third-stage outlet 402, one side wall is provided with a third-stage inlet 401, the third-stage inlet 401 is arranged at the side of the second mounting cover 3, and is arranged to match and correspond to the second-stage second outlet 303.

[0035] like Figure 2 , Figure 3 As shown, the power of the first crushing device 5 is a gear drive device, including a first squeezing roller group 501 and a second squeezing roller group 502. A group of first bearing seats 508 are respectively arranged at both ends of the transmission shafts of the first squeezing roller group 501 and the second squeezing roller group 502. One end of the transmission shaft of the first squeezing roller group 501 is connected to the output shaft of the first motor 503. A first gear 504 is also arranged on the output shaft of the first motor 503. A second gear 505 is arranged at one end of the transmission shaft of the second squeezing roller group 502. The first gear 504 and the second gear 505 are arranged in meshing. A first extrusion plate 506 is arranged on the side of the first extrusion roller set 501, and the first extrusion plate 506 is fixedly arranged on the side wall of the first installation cover 2. A second extrusion plate 507 is arranged on the side of the second extrusion roller set 502, and the second extrusion plate 507 is fixedly arranged on the side wall of the first installation cover 2. The first extrusion plate 506 and the second extrusion plate 507 are triangular structures, and the surfaces facing the first extrusion roller set 501 and the second extrusion roller set 502 are provided with extrusion ridges, which are extrusion surfaces, and the other two surfaces are fixed connection surfaces, which are fixedly connected to the first installation cover 2. A screening component is arranged below the first extrusion roller set 501 and the second extrusion roller set 502, and the screening component includes a first screen plate 10, one end of which is arranged on the side wall of the first installation cover 2 and is located below the second extrusion plate 507, and the other end is arranged at the first-level second outlet 203. The first screen plate 10 is a plate structure, and the first screen plate 10 is arranged in a downwardly inclined shape, and a hollow through groove is arranged thereon, which is used to screen the coal particles according to requirements.

[0036] like Figure 3 As shown, the extrusion rollers of the first extrusion roller set 501 and the second extrusion roller set 502 are provided with protruding spiral extrusion strips.

[0037] like Figure 2, Figure 3 As shown, the power of the second crushing device 6 is a gear drive device, including a third extrusion roller set 601 and a fourth extrusion roller set 602. A set of second bearing seats 608 are respectively arranged at both ends of the transmission shafts of the third extrusion roller set 601 and the fourth extrusion roller set 602. One end of the transmission shaft of the third extrusion roller set 601 is connected to the output shaft of the second motor 603, and a third gear 604 is also arranged on the output shaft of the second motor 603. A fourth gear 605 is arranged at one end of the transmission shaft of the fourth extrusion roller set 602, and the third gear 604 and the fourth gear 605 are arranged in meshing. A third extrusion plate 606 is arranged on the side of the third extrusion roller set 601, and the third extrusion plate 606 is fixedly arranged on the side wall of the second installation cover 3. A fourth extrusion plate 607 is arranged on the side of the fourth extrusion roller set 602, and the fourth extrusion plate 607 is fixedly arranged on the side wall of the second installation cover 3. The third extrusion plate 606 and the fourth extrusion plate 607 are triangular structures, and the surfaces facing the third extrusion roller set 601 and the fourth extrusion roller set 602 are provided with extrusion ridges, which are extrusion surfaces, and the other two surfaces are fixed connection surfaces, which are fixedly connected to the second installation cover 3. A screening component is arranged below the third extrusion roller set 601 and the fourth extrusion roller set 602, and the screening component includes a first screen plate 10, one end of which is arranged on the side wall of the second installation cover 3 and is located below the third extrusion plate 606, and the other end is arranged at the second secondary outlet 303. The first screen plate 10 is a plate structure, and the first screen plate 10 is arranged in a downwardly inclined shape, and a hollow through groove is arranged thereon, which is used to screen the coal particles according to requirements.

[0038] like Figure 3 As shown, the extrusion rollers of the third extrusion roller set 601 and the fourth extrusion roller set 602 are provided with longitudinal extrusion ridges along the circumference of the central axis.

[0039] like Figure 2 , Figure 3 As shown, the power of the third crushing device 7 is a gear drive device, including a fifth extrusion roller group 701 and a sixth extrusion roller group 702. A group of third bearing seats 707 are respectively arranged at both ends of the transmission shafts of the fifth extrusion roller group 701 and the sixth extrusion roller group 702. One side end of the transmission shaft of the fifth extrusion roller group 701 is connected to the output shaft of the third motor 703. A fifth gear 704 is also arranged on the output shaft of the third motor 703. A sixth gear 705 is arranged at one side end of the transmission shaft of the sixth extrusion roller group 702. The fifth gear 704 and the sixth gear 705 are arranged in meshing. An extrusion screen plate 706 is arranged below the fifth extrusion roller group 701 and the sixth extrusion roller group 702. Figure 4 As shown, the interior of the extrusion screen plate 706 is a groove structure, the groove walls on both sides are inclined downward, and extrusion ridges are provided on the groove walls. A screen groove 7061 is provided through the bottom end surface of the extrusion screen plate 706, and the screen groove 7061 is a coal block particle channel.

[0040] like Figure 3 , Figure 5 As shown, the squeezing rollers of the fifth squeezing roller set 701 and the sixth squeezing roller set 702 are formed by alternatingly combining integral combination wheels 708 , and the integral combination wheel 708 includes a circular ring wheel 7081 and a gear ring wheel 7082 .

[0041] Furthermore, in order to enable the first crushing device 5 and the second crushing device 6 to perform a better screening function, a second embodiment of a floating screening device that is superior to the first screen plate 10 is provided.

[0042] The floating screening device of the second embodiment is matched with the first crushing device 5 and the second crushing device 6 respectively, and is installed and fixed on the first mounting cover 2 and the second mounting cover 3. Its structure and installation method are the same, so the accompanying drawings illustrate the embodiment arranged on the first mounting cover 2 as an example.

[0043] like Figure 6 , Figure 7 , Figure 8 As shown, the floating screening device includes a second screen plate assembly 8 and a floating seat assembly 9. The second screen plate assembly 8 includes a second screen plate 801. A rotating shaft hinge 802 is provided at one end of the second screen plate 801. The second screen plate 801 can rotate along the rotating shaft hinge 802. The rotating shaft hinge 802 is fixedly arranged on the side wall of the first mounting cover 2. The other end of the second screen plate 801 is tilted downward to the first-level second outlet 203, and a floating seat assembly 9 is arranged below. The floating seat assembly 9 includes a mounting support plate 901. The mounting support plate 901 is an L-shaped bracket. The vertical plate is fixedly arranged on the inner wall of the first mounting cover 2 below the first-level second outlet 203, and a plurality of floating seats 902 are arranged on the horizontal plate. Figure 8 As shown, the floating seat 902 includes a support 9021, an upper retaining ring 9023 is provided on the top of the support 9021, a lower retaining plate 9024 is provided on the bottom, a circular through hole is provided in the support 9021, a floating pin 9022 is passed through the circular through hole, the top and bottom of the floating pin pass through the upper retaining ring 9023 and the lower retaining plate 9024, a spring 9025 is sleeved on the floating pin 9022, and the spring 9025 is provided in the circular through hole of the support 9021, and the floating pin 9022 can float up and down under the elastic force of the spring 9025. A ball head 9026 is also provided on the floating pin 9022 to reduce the friction between the top of the floating pin 9022 and the second screen plate 801.

[0044] like Figure 7 As shown, a plurality of sieve slots 8011 are provided through the second sieve plate 801 , and a raised strip 8012 is also provided on the second sieve plate 801 . The raised strip 8012 is perpendicular to the sieve slots 8011 , thereby increasing the screening time and improving the screening effect.

[0045] The crushed coal blocks fall from the squeezing roller wheel group of the first crushing device 5 and the second crushing device 6 and fall onto the floating screening device. The coal blocks roll on the second screen plate 801 due to their own weight. Smaller coal blocks leak out from the vertical outlet, and larger coal blocks pass through the second screen plate 801 and enter the next crushing and screening device. Under the action of the floating seat 902, the second screen plate 801 will vibrate up and down to improve the screening effect.

[0046] like Figures 1 to 3 As shown, initially, the coal to be crushed enters the first crushing device 5 from the first-level inlet 201 on the first installation cover 2, and the gear drive device is running. The coal is crushed under the mutual squeezing action between the first squeezing roller group 501, the second squeezing roller group 502, the first squeezing plate 506, and the second squeezing plate 507. Qualified coal particles pass through the sieve plate device and flow out from the first-level first outlet 202, and unqualified coal particles pass through the sieve plate device from the first-level second outlet 203 and the second-level inlet 301 into the second crushing device 6. The gear drive device is running, and the coal is squeezed between the third squeezing roller group 601, the fourth squeezing roller group 602, and the first squeezing plate 506. The coal is further crushed under the mutual squeezing action between the pressing roller group 602, the third squeezing plate 606, and the fourth squeezing plate 607. The qualified coal particles flow out from the second-level first outlet 302 through the screen plate device, and the unqualified coal particles enter the third crushing device 7 through the screen plate device from the second-level second outlet 303 and the third-level inlet 401. The gear drive device is running, and the coal is crushed under the mutual squeezing action of the fifth squeezing roller group 701, the sixth squeezing roller group 702, and the squeezing screen plate 706. The crushed coal passes through the screen slot 7061 at the bottom of the squeezing screen plate 706 and flows out from the third-level outlet 402. In this cycle, the coal is processed into the required particle size through the three-level crushing and screening device.

Claims

1. A stepped coal crushing device, comprising a frame (1), wherein the frame (1) comprises a primary stepped support (101), a secondary stepped support (102), and a tertiary stepped support (103), wherein the primary stepped support (101), the secondary stepped support (102), and the tertiary stepped support (103) are arranged from top to bottom in a stepped shape, and characterized in that: A first-stage mounting platform (104) is arranged on the side of the first-stage stepped support (101), a second-stage mounting platform (105) is arranged on the side of the second-stage stepped support (102), and a third-stage mounting platform (106) is arranged on the side of the third-stage stepped support (103). A first mounting cover (2) is arranged inside the first-stage stepped support (101), and a first crushing device (5) is arranged inside the first mounting cover (2). The first crushing device (5) is fixedly arranged on the first-stage mounting platform (104), and a screening component is arranged below the first crushing device (5). A first mounting cover (2) is arranged inside the second-stage stepped support (102). A second mounting cover (3), a second crushing device (6) is arranged in the second mounting cover (3), the second crushing device (6) is fixedly arranged on the second mounting platform (105), a screening component is arranged below the second crushing device (6), a third mounting cover (4) is arranged in the third mounting cover (4), a third crushing device (7) is fixedly arranged on the third mounting platform (106), and the first crushing device (5), the second crushing device (6) and the third crushing device (7) are gear-driven extrusion wheel assembly devices.

2. The step coal crushing device according to claim 1 is characterized in that: The first crushing device (5) comprises a first squeezing roller set (501) and a second squeezing roller set (502), the first squeezing roller set (501) and the second squeezing roller set (502) being driven by gear meshing, the squeezing rollers of the first squeezing roller set (501) and the second squeezing roller set (502) being provided with protruding spiral squeezing strips, the first squeezing roller set (501) being provided with a first squeezing plate (506) on the side, the first squeezing plate (506) being fixedly arranged on the side wall of the first mounting cover (2), and the second squeezing roller set (502) being provided with a first squeezing plate (506) on the side. A second extrusion plate (507) is provided, and the second extrusion plate (507) is fixedly arranged on the side wall of the first mounting cover (2); the first extrusion plate (506) and the second extrusion plate (507) are triangular structures, and extrusion ridges are arranged on the surfaces facing the first extrusion roller group (501) and the second extrusion roller group (502); a screening component is arranged below the first extrusion roller group (501) and the second extrusion roller group (502), and the screening component comprises a first screen plate (10), and the first screen plate (10) is arranged in a downwardly inclined state and is provided with a hollow through groove.

3. The step coal crushing device according to claim 1 is characterized in that: The third crushing device (7) comprises a fifth extrusion roller group (701) and a sixth extrusion roller group (702), wherein the fifth extrusion roller group (701) and the sixth extrusion roller group (702) are driven by gear meshing, and an extrusion screen plate (706) is arranged below the fifth extrusion roller group (701) and the sixth extrusion roller group (702), wherein the interior of the extrusion screen plate (706) is a groove structure, and the groove walls on both sides are arranged to be inclined downward, and the groove walls are provided with extrusion ridges, and the bottom end surface of the extrusion screen plate (706) is penetrated by a screen groove (7061), and the extrusion rollers arranged on the fifth extrusion roller group (701) and the sixth extrusion roller group (702) are composed of an integral combination wheel (708) that is alternately combined, and the integral combination wheel (708) comprises a circular ring wheel (7081) and a gear ring wheel (7082).

4. The step coal crushing device according to claim 1 is characterized in that: The second crushing device (6) comprises a third squeezing roller group (601) and a fourth squeezing roller group (602), wherein the squeezing rollers of the third squeezing roller group (601) and the fourth squeezing roller group (602) are provided with longitudinal squeezing ridges along the circumference of the central axis.

5. The step coal crushing device according to claim 1, characterized in that: The screening component is a floating screening device, which comprises a second screen plate assembly (8) and a floating seat assembly (9). The second screen plate assembly (8) comprises a second screen plate (801). A rotating shaft hinge (802) is arranged at one end of the second screen plate (801). The rotating shaft hinge (802) is fixedly arranged on the side wall of the first mounting cover (2). The other end of the second screen plate (801) is arranged to be tilted downward, and a floating seat assembly (9) is arranged below. The floating seat assembly (9) comprises a mounting support plate (901). The mounting support plate (901) is an L-shaped bracket. The vertical plate is fixedly arranged on the inner wall of the first mounting cover (2), and a plurality of floating seats (902) are arranged on the horizontal plate.

6. The step coal crushing device according to claim 5, characterized in that: The floating seat (902) comprises a support (9021), an upper retaining ring (9023) is arranged on the top of the support (9021), and a lower retaining plate (9024) is arranged on the bottom. A circular through hole is arranged in the support (9021), and a floating pin (9022) is passed through the circular through hole. The top and bottom of the floating pin pass through the upper retaining ring (9023) and the lower retaining plate (9024). A spring (9025) is sleeved on the floating pin (9022), and the spring (9025) is arranged in the circular through hole of the support (9021). A ball head (9026) is also arranged on the floating pin (9022).

7. The step coal crushing device according to claim 5, characterized in that: The second sieve plate (801) is provided with a plurality of sieve hole slots (8011) extending therethrough. The second sieve plate (801) is also provided with a raised strip (8012), wherein the raised strip (8012) is perpendicular to the sieve hole slots (8011).

8. The step coal crushing device according to claim 1, characterized in that: The first installation cover (2) is provided with a primary inlet (201) at the top, a primary first outlet (202) at the bottom, a primary second outlet (203) at the side wall, and the primary second outlet (203) is arranged on the side of the second installation cover (3); a secondary first outlet (302) is provided at the bottom port of the second installation cover (3), a secondary inlet (301) is provided on one side of the side wall, the secondary inlet (301) is arranged on one side of the first installation cover (2), and is arranged to match and correspond to the primary second outlet (203); a secondary second outlet (303) is provided on the other side of the side wall of the second installation cover (3), and the secondary second outlet (303) is arranged on the side of the third installation cover (4); a tertiary outlet (402) is provided at the bottom port of the third installation cover (4), a tertiary inlet (401) is provided on one side of the side wall, and the tertiary inlet (401) is arranged on the side of the second installation cover (3), and is arranged to match and correspond to the secondary second outlet (303).

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