Crushing and screening machine for coal mining

Abstract

The utility model discloses a crushing and screening machine for coal mining. The crushing and screening machine comprises a bottom plate, a supporting frame, a connecting block, a connecting frame, a grinding box, a smashing box, a filtering plate, a vibration assembly, a smashing assembly, a grinding assembly and a transmission assembly. Wherein the bottom plate is provided with an upper end face; the supporting frame is fixedly installed on the upper end face of the bottom plate. The connecting block is fixedly installed on one side of the supporting frame. The connecting frame is fixedly installed on the sides, away from the supporting frame, of the multiple connecting blocks. The grinding box is fixedly mounted at the top of the connecting frame; the crushing box is fixedly mounted at the top of the grinding box; the filter plate is arranged between the two support frames; the vibration assembly is arranged between the filter plate and the connecting block; the crushing assembly is arranged in the crushing box; the grinding assembly is arranged in the grinding box; through cooperative use of the structures, the filter plate can vibrate back and forth, coal mines on the filter plate are screened, the situation that the coal mines are blocked on the filter plate is reduced, and the screening efficiency of the coal mines is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coal mine production, and in particular to a crushing and screening machine for coal mining. Background Art

[0002] With the increasing demand for resources, the coal industry has been vigorously developed, and the resulting coal machinery has also developed rapidly. Coal crushers, as a type of coal machinery, play an important role in coal crushing. Coal crushers are mainly used for coal crushing, but can also be used to crush other materials such as ore and slag. After the coal is crushed, it is screened by a screen plate mechanism to obtain finer coal.

[0003] Upon investigation, a Chinese utility model patent discloses a coal mine crushing device for coal mining (publication number: CN215353869U), which includes a slave pulley, a transmission belt, a drive motor, a support plate, a conveyor belt, a conveyor guide roller, a first rotating rod, an opening, a wire filter, a crushing rotating rod, a crushing knife, a second rotating rod, a primary crushing roller, a hopper, a main rotating pulley, a first motor, an electric control box, a bevel block and a second motor.

[0004] In the above patent, the edge frame of the wire filter is fixedly connected to the inner surface of the crushing box, and the crushed coal is screened through the wire filter. However, the wire filter is fixedly installed on the inner surface of the crushing box. When the crushed coal falls on the surface of the wire filter, it may cause the coal to accumulate on the surface of the screen, forming a "dead material area". The accumulated coal hinders the passage of fine particles, resulting in uneven screening. Long-term accumulation may also cause the screen to deform or be damaged. Utility Model Content

[0005] The main purpose of this application is to provide a crushing and screening machine for coal mining, aiming to solve the technical problem of coal accumulation on the screen surface.

[0006] To achieve the above-mentioned objectives, the present application provides a crushing and screening machine for coal mining, comprising a base plate, a support frame, a connecting block, a connecting frame, a crushing box, a pulverizing box, a filter plate, a vibration assembly, a pulverizing assembly, a crushing assembly and a transmission assembly; wherein, the base plate has an upper end surface; the support frame is fixedly mounted on the upper end surface of the base plate; the connecting block is fixedly mounted on one side of the support frame; the connecting frame is fixedly mounted on a side of multiple connecting blocks away from the support frame; the crushing box is fixedly mounted on the top of the connecting frame; the pulverizing box is fixedly mounted on the top of the crushing box; the filter plate is arranged between two of the support frames; the vibration assembly is arranged between the filter plate and the connecting block; the pulverizing assembly is arranged inside the pulverizing box; the crushing assembly is arranged inside the pulverizing box; the transmission assembly is arranged between the crushing box and one side of the pulverizing box.

[0007] Optionally, the vibration assembly includes a connecting rod, a lower limit plate, an upper limit plate, a fixed rod, a first spring and a protective plate; the connecting rod is movably installed inside the connecting block; the lower limit plate is fixedly installed at the bottom end of the connecting rod; the upper limit plate is slidably installed on the side surface of the connecting rod; the fixed rod is fixedly installed on the bottom of the upper limit plate; the first spring is sleeved on the side surface of the connecting rod; and the protective plate is fixedly installed on the top of the filter plate.

[0008] Optionally, the bottom end of the fixing rod is fixedly connected to the top of the protective plate, one end of the first spring is fixedly connected to the top of the lower limit plate, and the other end of the first spring is fixedly connected to the bottom of the upper limit plate.

[0009] Optionally, the crushing assembly includes a first crushing roller, a second crushing roller and a motor; the first crushing roller is rotatably installed inside the crushing box; the second crushing roller is rotatably installed inside the crushing box; the motor is fixedly installed on one side of the crushing box, and the output end of the motor passes through one side of the crushing box and is fixedly connected to one side of the first crushing roller.

[0010] Optionally, the crushing assembly includes a crushing roller, an inclined plate, a protrusion and a second spring; the crushing roller is rotatably mounted inside the crushing box; the inclined plate is rotatably mounted inside the crushing box through a hinged seat, and two inclined plates are provided and distributed on both sides of the crushing roller; the protrusion is fixedly mounted on the side of the inclined plate close to the crushing roller; and the second spring is provided inside the crushing box.

[0011] Optionally, there are multiple protrusions, which are evenly distributed on the inclined plate, and the protrusions are engaged with the crushing roller. One end of the second spring is fixedly connected to the inner wall of one side of the crushing box, and the other end of the second spring is fixedly connected to the side of the inclined plate away from the crushing roller.

[0012] Optionally, the transmission assembly includes a first synchronous wheel, a second synchronous wheel, a third synchronous wheel and a synchronous belt; the first synchronous wheel is rotatably installed on one side of the crushing box; the second synchronous wheel is rotatably installed on one side of the crushing box; the third synchronous wheel is rotatably installed on one side of the crushing box; and the synchronous belt is movably installed between the first synchronous wheel, the second synchronous wheel and the third synchronous wheel.

[0013] Optionally, the ends of the first crushing roller and the second crushing roller away from the motor both pass through one side of the crushing box and are fixedly connected to one side of the second synchronous wheel and the first synchronous wheel respectively; one end of the crushing roller passes through one side of the crushing box and is fixedly connected to one side of the third synchronous wheel.

[0014] Optionally, a first collecting box is movably connected to the top of the bottom plate, and the first collecting box is arranged below the filter plate.

[0015] Optionally, a second collecting box is movably connected to the top of the bottom plate, and the second collecting box is arranged on one side of the filter plate.

[0016] The crushing and screening machine for coal mining provided in the embodiment of the application can make the filter plate vibrate back and forth through the vibration assembly, screen the coal on the filter plate, crush the large pieces of coal through the arrangement of the crushing assembly, crush the crushed coal through the arrangement of the crushing assembly, and make the crushing assembly and the crushing assembly start at the same time through the arrangement of the transmission assembly, so that the clogging of the coal on the filter plate is reduced, and the screening efficiency of the coal is improved.

[0017] Additional aspects and advantages of the present application will be described in part below, some of which will become apparent from the following description, or will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 Structure diagram of the crushing and screening machine for coal mining provided in the embodiment of the application Figure 1

[0020] Figure 2 Structure diagram of the crushing and screening machine for coal mining provided in the embodiment of the application Figure 2

[0021] Figure 3 Cross-sectional view of the crushing box in the embodiment of the application

[0022] Figure 4 Enlarged view of A in the embodiment of the application Figure 2

[0023] Figure 5 Enlarged view of B in the embodiment of the application Figure 3

[0024] Figure 6 Installation diagram of the lower limit plate in the embodiment of the application

[0025] Figure 7 ​​​​This is a schematic diagram of the installation of the crushing roller in the embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of the installation of the synchronous belt in the embodiment of the present application.

[0027] Figure numerals: 1. bottom plate; 2. support frame; 3. connecting block; 4. connecting frame; 5. crushing box; 6. crushing box; 7. vibration assembly; 8. crushing assembly; 9. crushing assembly; 10. transmission assembly; 11. connecting rod; 12. lower limit plate; 13. upper limit plate; 14. fixing rod; 15. first spring; 16. protective plate; 17. first crushing roller; 18. second crushing roller; 19. motor; 20. crushing roller; 21. inclined plate; 22. protrusion; 23. second spring; 24. first synchronous wheel; 25. second synchronous wheel; 26. third synchronous wheel; 27. synchronous belt; 28. first collecting box; 29. ​​second collecting box; 30. filter plate.

[0028] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 Schematic diagram of the structure of the crushing and screening machine for coal mining provided in the embodiment of the present application Figure 1 ; Figure 2 Schematic diagram of the structure of the crushing and screening machine for coal mining provided in the embodiment of the present application Figure 2 ; Figure 3 This is a cross-sectional view of a crushing box in an embodiment of the present application; Figure 4 In the embodiment of this application Figure 2 A magnified view of point A in the figure; Figure 5 In the embodiment of this application Figure 3 Enlarged view of point B in FIG. Figure 6 This is a schematic diagram of the installation of the lower limit plate in the embodiment of the present application; Figure 7 This is a schematic diagram of the installation of the crushing roller in the embodiment of the present application; Figure 8 This is a schematic diagram of the installation of the synchronous belt in the embodiment of the present application.

[0035] The present application embodiment provides a crushing and screening machine for coal mining, such as Figure 1 As shown, the crushing and screening machine for coal mining includes a bottom plate 1, a support frame 2, a connecting block 3, a connecting frame 4, a crushing box 5, a crushing box 6, a filter plate 30, a vibration component 7, a crushing component 8, a crushing component 9 and a transmission component 10;

[0036] The bottom plate 1 has an upper end surface; the support frame 2 is fixedly mounted on the upper end surface of the bottom plate 1; the connecting block 3 is fixedly mounted on one side of the supporting frame 2; the connecting frame 4 is fixedly mounted on the side of the multiple connecting blocks 3 away from the supporting frame 2; the crushing box 5 is fixedly mounted on the top of the connecting frame 4, and the coal is crushed from the inside of the crushing box 5;

[0037] The crushing box 6 is fixedly mounted on the top of the crushing box 5; the filter plate 30 is arranged between the two support frames 2; the coal crushed inside the crushing box 6 is further crushed by the crushing box 5, and enters the top of the filter plate 30 through the unloading hopper at the bottom of the connecting frame 4 for screening.

[0038] Please combine Figure 2 and Figure 3 For reference, the vibration component 7 is disposed between the filter plate 30 and the connecting block 3 , and the vibration component 7 enables the filter plate 30 to vibrate back and forth, thereby screening the coal on the filter plate 30 .

[0039] Please combine Figure 1-Figure 3 For reference, the crushing assembly 8 is arranged inside the crushing box 6; the arrangement of the crushing assembly 8 can crush large pieces of coal.

[0040] Please combine Figure 3 For reference, the crushing assembly 9 is arranged inside the crushing box 5; the arrangement of the crushing assembly 9 can crush the pulverized coal.

[0041] like Figure 2 As shown, the transmission assembly 10 is arranged on one side of the crushing box 5 and the pulverizing box 6; the arrangement of the transmission assembly 10 can enable the pulverizing assembly 8 and the crushing assembly 9 to start at the same time.

[0042] Specifically, the vibration component 7 enables the filter plate 30 to vibrate back and forth, and the coal on the filter plate 30 is screened. The setting of the crushing component 8 can crush large pieces of coal, and the setting of the crushing component 9 can crush the crushed coal. The setting of the transmission component 10 can enable the crushing component 8 and the crushing component 9 to start at the same time, reducing the blockage of coal on the filter plate 30 and improving the screening efficiency of coal.

[0043] Please continue to combine Figure 2 、 Figure 3 and Figure 4 For reference, in an exemplary embodiment, the vibration assembly 7 includes a connecting rod 11, a lower limit plate 12, an upper limit plate 13, a fixing rod 14, a first spring 15 and a protective plate 16; the connecting rod 11 is movably mounted inside the connecting block 3; the lower limit plate 12 is fixedly mounted on the bottom end of the connecting rod 11; the upper limit plate 13 is slidably mounted on the side surface of the connecting rod 11; the fixing rod 14 is fixedly mounted on the bottom of the upper limit plate 13; the first spring 15 is sleeved on the side surface of the connecting rod 11; and the protective plate 16 is fixedly mounted on the top of the filter plate 30.

[0044] The bottom end of the fixing rod 14 is fixedly connected to the top of the protective plate 16 , one end of the first spring 15 is fixedly connected to the top of the lower limit plate 12 , and the other end of the first spring 15 is fixedly connected to the bottom of the upper limit plate 13 .

[0045] Specifically, the coal after passing through the crushing component 8 and the grinding component 9 enters the top of the filter plate 30 through the unloading hopper at the bottom of the connecting frame 4. When the coal falls on the top of the filter plate 30, the filter plate 30 moves downward due to gravity, and the movement of the filter plate 30 drives the protective plate 16 fixed thereto to move synchronously. The movement of the protective plate 16 drives the protective plate 16 on top to move synchronously, and the movement of the protective plate 16 drives the upper limit plate 13 to move. The setting of the first spring 15 plays a role of buffering and resetting. When the upper limit plate 13 moves downward, the first spring 15 is compressed and stores elastic potential energy; when the vibration component 7 moves in the opposite direction, the first spring 15 releases the elastic potential energy, pushing the upper limit plate 13 and the protective plate 16 to move upward, thereby realizing rapid vibration of the filter plate 30. This design not only enhances the stability and uniformity of the vibration, but also effectively extends the service life of the vibration component 7, ensuring the efficient coal screening.

[0046] Please continue to combine Figure 1 and Figure 8 For reference, in an exemplary embodiment, the pulverizing assembly 8 includes a first pulverizing roller 17, a second pulverizing roller 18 and a motor 19; the first pulverizing roller 17 is rotatably mounted inside the pulverizing box 6; the second pulverizing roller 18 is rotatably mounted inside the pulverizing box 6; the motor 19 is fixedly mounted on one side of the pulverizing box 6, and the output end of the motor 19 passes through one side of the pulverizing box 6 and is fixedly connected to one side of the first pulverizing roller 17.

[0047] Specifically, one end of the second crushing roller 18 is connected to the other end of the first crushing roller 17 through the transmission assembly 10, so that when the motor 19 is started, it can drive the first crushing roller 17 to rotate, and then drive the second crushing roller 18 to rotate synchronously through the transmission assembly 10, thereby crushing the coal entering the crushing box 6, thereby improving the crushing effect. A discharge port is provided at the bottom of the crushing box 6, and the crushed coal is discharged through the discharge port, which is convenient for subsequent screening and processing.

[0048] In one embodiment, please combine Figure 3 、 Figure 5 and Figure 8 For reference, the crushing assembly 9 includes a crushing roller 20, an inclined plate 21, a protrusion 22 and a second spring 23; the crushing roller 20 is rotatably mounted inside the crushing box 5; the inclined plate 21 is rotatably mounted inside the crushing box 5 through a hinged seat, and two are provided and distributed on both sides of the crushing roller 20; the protrusion 22 is fixedly mounted on the side of the inclined plate 21 close to the crushing roller 20; and the second spring 23 is provided inside the crushing box 5.

[0049] There are multiple protrusions 22, which are evenly distributed on the inclined plate 21. The protrusions 22 engage with the crushing roller 20. One end of the second spring 23 is fixedly connected to the inner wall of one side of the crushing box 5, and the other end of the second spring 23 is fixedly connected to the side of the inclined plate 21 away from the crushing roller 20.

[0050] Specifically, when the coal enters the crushing box 5, it first contacts the crushing roller 20. Since the protrusions 22 mesh with the crushing roller 20, when the crushing roller 20 rotates, the coal is crushed by the cooperation between the protrusions 22. When there is a large amount of coal inside the crushing box 5, the protrusions 22 are pushed, which in turn drives the inclined plate 21 to rotate about the hinge seat. The rotation of the inclined plate 21 causes the coal to be squeezed and rubbed inside the crushing box 5, thereby achieving further crushing. At the same time, the provision of the second spring 23 enables the inclined plate 21 to return to its original position after being pushed by the crushing roller 20, so as to crush the next batch of coal entering the crushing box 5. This design not only improves the coal crushing efficiency, but also ensures the uniformity of the crushing effect.

[0051] Please combine Figure 2 and Figure 8 For reference, in the exemplary embodiment, the transmission assembly 10 includes a first synchronous wheel 24, a second synchronous wheel 25, a third synchronous wheel 26 and a synchronous belt 27; the first synchronous wheel 24 is rotatably mounted on one side of the crushing box 6; the second synchronous wheel 25 is rotatably mounted on one side of the crushing box 6; the third synchronous wheel 26 is rotatably mounted on one side of the crushing box 5; and the synchronous belt 27 is movably mounted between the first synchronous wheel 24, the second synchronous wheel 25 and the third synchronous wheel 26.

[0052] The ends of the first crushing roller 17 and the second crushing roller 18 away from the motor 19 both pass through one side of the crushing box 6 and are fixedly connected to one side of the second synchronous wheel 25 and the first synchronous wheel 24 respectively. One end of the crushing roller 20 passes through one side of the crushing box 5 and is fixedly connected to one side of the third synchronous wheel 26.

[0053] Specifically, when the motor 19 starts, the output shaft of the motor 19 drives the first crushing roller 17 and the second crushing roller 18 to rotate inside the crushing box 6. Since the first crushing roller 17 and the second crushing roller 18 are fixedly connected to the second synchronous wheel 25 and the first synchronous wheel 24 respectively at the ends away from the motor 19, the rotation of the first crushing roller 17 and the second crushing roller 18 drives the second synchronous wheel 25 and the first synchronous wheel 24 to rotate respectively. Since the synchronous belt 27 is movably installed between the first synchronous wheel 24, the second synchronous wheel 25 and the third synchronous wheel 26, when the first synchronous wheel 24 and the second synchronous wheel 25 rotate, the third synchronous wheel 26 is driven to rotate through the synchronous belt 27, and the rotation of the third synchronous wheel 26 drives the crushing roller 20 to rotate inside the crushing box 5. This transmission mode is not only compact in structure, but also high in transmission efficiency, and can ensure the stable operation of the crushing roller and the crushing roller, thereby improving the crushing and screening efficiency of the coal mine.

[0054] Please refer to Figure 1-Figure 3 In the example embodiment, the first collecting box 28 is movably connected to the top of the base plate 1, and the first collecting box 28 is arranged below the filter plate 30.

[0055] The second collecting box 29 is movably connected to the top of the base plate 1, and the second collecting box 29 is arranged on one side of the filter plate 30.

[0056] Specifically, the first collecting box 28 is used to collect larger coal particles after preliminary screening, which may not pass through the screening of the filter plate 30 due to the size being too large, and the second collecting box 29 is used to collect fine and required coal particles after screening by the filter plate 30. Such a design allows coal particles to be classified and collected according to different sizes, improving the screening efficiency and purity of the coal mine. In addition, the movable connection of the first collecting box 28 and the second collecting box 29 allows the user to take out or replace the collecting box at any time according to the needs, further improving the practicality and convenience of the equipment.

[0057] The crushing and screening machine for coal mining provided by the embodiment of the application can make the filter plate 30 vibrate back and forth through the vibration assembly 7 to screen the coal on the filter plate 30. The large pieces of coal can be crushed through the crushing assembly 8, the crushed coal can be crushed through the crushing assembly 9, and the crushing assembly 8 and the crushing assembly 9 can be started at the same time through the transmission assembly 10, thereby reducing the blocking of the coal on the filter plate 30 and improving the screening efficiency of the coal.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A crushing and screening machine for coal mining, characterized in that: include: A bottom plate (1) having an upper end surface; A support frame (2) is fixedly mounted on the upper end surface of the base plate (1); A connecting block (3) is fixedly mounted on one side of the support frame (2); A connecting frame (4) is fixedly mounted on a side of the plurality of connecting blocks (3) away from the supporting frame (2); A crushing box (5) is fixedly mounted on the top of the connecting frame (4); A crushing box (6) is fixedly mounted on the top of the crushing box (5); A filter plate (30) is arranged between the two support frames (2); a vibration assembly (7), arranged between the filter plate (30) and the connecting block (3); A crushing assembly (8) is arranged inside the crushing box (6); A crushing assembly (9) is arranged inside the crushing box (5); The transmission assembly (10) is arranged on one side of the crushing box (5) and the pulverizing box (6).

2. The crushing and screening machine for coal mining according to claim 1, characterized in that: The vibration component (7) comprises: A connecting rod (11) movably mounted inside the connecting block (3); A lower limit plate (12) is fixedly mounted on the bottom end of the connecting rod (11); an upper limit plate (13) slidably mounted on a side surface of the connecting rod (11); A fixing rod (14) fixedly mounted on the bottom of the upper limit plate (13); A first spring (15) is sleeved on a side surface of the connecting rod (11); A protective plate (16) is fixedly mounted on the top of the filter plate (30).

3. The crushing and screening machine for coal mining according to claim 2, characterized in that: The bottom end of the fixing rod (14) is fixedly connected to the top of the protective plate (16), one end of the first spring (15) is fixedly connected to the top of the lower limit plate (12), and the other end of the first spring (15) is fixedly connected to the bottom of the upper limit plate (13).

4. The crushing and screening machine for coal mining according to claim 1, characterized in that: The crushing assembly (8) comprises: A first crushing roller (17) rotatably mounted inside the crushing box (6); a second crushing roller (18) rotatably mounted inside the crushing box (6); The motor (19) is fixedly mounted on one side of the crushing box (6), and the output end of the motor (19) passes through one side of the crushing box (6) and is fixedly connected to one side of the first crushing roller (17).

5. The crushing and screening machine for coal mining according to claim 4, characterized in that: The crushing assembly (9) comprises: A crushing roller (20) rotatably mounted inside the crushing box (5); Two inclined plates (21) are rotatably mounted inside the crushing box (5) via a hinged seat and are distributed on both sides of the crushing roller (20); a protrusion (22) fixedly mounted on a side of the inclined plate (21) close to the crushing roller (20); The second spring (23) is arranged inside the crushing box (5).

6. The crushing and screening machine for coal mining according to claim 5, characterized in that: A plurality of protrusions (22) are provided, and the protrusions (22) are evenly distributed on the inclined plate (21). The protrusions (22) engage with the crushing roller (20). One end of the second spring (23) is fixedly connected to an inner wall of one side of the crushing box (5), and the other end of the second spring (23) is fixedly connected to a side of the inclined plate (21) away from the crushing roller (20).

7. The crushing and screening machine for coal mining according to claim 5, characterized in that: The transmission assembly (10) comprises: A first synchronous wheel (24) is rotatably mounted on one side of the crushing box (6); A second synchronous wheel (25) is rotatably mounted on one side of the crushing box (6); a third synchronous wheel (26) rotatably mounted on one side of the crushing box (5); A synchronous belt (27) is movably installed between the first synchronous wheel (24), the second synchronous wheel (25) and the third synchronous wheel (26).

8. The crushing and screening machine for coal mining according to claim 7, characterized in that: The ends of the first crushing roller (17) and the second crushing roller (18) away from the motor (19) both pass through one side of the crushing box (6) and are fixedly connected to one side of the second synchronous wheel (25) and the first synchronous wheel (24), respectively. One end of the crushing roller (20) passes through one side of the crushing box (5) and is fixedly connected to one side of the third synchronous wheel (26).

9. The crushing and screening machine for coal mining according to claim 1, characterized in that: A first collecting box (28) is movably connected to the top of the bottom plate (1), and the first collecting box (28) is arranged below the filter plate (30).

10. The crushing and screening machine for coal mining according to claim 9, characterized in that: A second collecting box (29) is movably connected to the top of the bottom plate (1), and the second collecting box (29) is arranged on one side of the filter plate (30).

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