A crushing device for cement production raw materials

Abstract

The present invention relates to a crushing device for raw materials in cement production, which comprises a housing. There is a crushing chamber inside the housing. A main shaft is installed in the crushing chamber. A rotor disc is connected to the main shaft. Hammer heads are provided on the rotor disc. First cushion blocks are arranged on the hammer heads. A counterattack plate is movably connected to the inner wall of the crushing chamber. Second cushion blocks are arranged on the side surface of the counterattack plate facing the rotor disc. Both the first cushion blocks and the second cushion blocks are integrally formed regular pentagonal prism structures composed of one side surface of a regular triangular prism and one side surface of a regular quadrangular prism. The first cushion blocks form crushing edges facing counterclockwise. The second cushion blocks are identical in shape and size to the first cushion blocks. The regular quadrangular prisms of the second cushion blocks are detachably connected to the counterattack plate. The second cushion blocks form crushing edges facing the rotor disc. The crushing device can automatically remove high-hardness impurities during the production process, eliminating the need for manual removal of metal impurities or high-hardness stones and ensuring production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of crushing equipment, and particularly relates to a crushing device for raw materials in cement production. Background Art

[0002] During the cement production process, most raw materials need to be crushed, such as limestone, clay, iron ore, and coal. Limestone is the raw material with the largest consumption in cement production. After mining, its particle size is relatively large, and it is a medium-hard ore. Therefore, the crushing of limestone plays a relatively important role in the material crushing of cement plants.

[0003] The impact crusher has the largest crushing ratio and can complete the crushing operation that other models need two or three stages to complete with one stage. Its system is simple, with fewer equipment used and lower construction costs. It is the first choice for cement plants to crush raw materials. However, in the prior art, most of the pads on the hammer head and the impact plate are flat. When dealing with raw materials adhered with mud, the mud will be transferred to the pads, resulting in a weakened impact force of the hammer head and the impact plate on the raw materials and a decline in the crushing effect. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a crushing device for raw materials in cement production, aiming to provide a crushing device that can handle raw materials adhered with mud and ensure the crushing effect. The present invention further solves the problem that the mixing of high-hardness impurities in the raw materials to be crushed will affect the service life of the crushing device and the subsequent operation of the mill.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A crushing device for raw materials in cement production includes a housing. There is a crushing chamber inside the housing. A main shaft is installed in the crushing chamber. A rotor disc is connected to the main shaft. Hammer heads are provided on the rotor disc. First pads are arranged on the hammer heads. An impact plate is movably connected to the inner wall of the crushing chamber. Second pads are arranged on the side of the impact plate facing the rotor disc;

[0007] Both the first pads and the second pads are integrally formed regular pentagonal prism structures composed of one side surface of a regular triangular prism and one side surface of a regular quadrangular prism. The three side surfaces of the regular triangular prism are respectively the first side surface, the second side surface, and the third side surface. The first side surface coincides with one side surface of the regular quadrangular prism. The regular quadrangular prism of the first pad is detachably connected to the hammer head. The second side surface and the third side surface of the first pad form a counterclockwise-facing crushing edge. The second pads and the first pads are the same in shape and size. The regular quadrangular prism of the second pad is detachably connected to the impact plate. The second side surface and the third side surface of the regular triangular prism of the second pad form a crushing edge facing the rotor disc;

[0008] The upper end of the housing is provided with a feeding port, and the lower end of the housing is provided with a crushed material discharge port corresponding to the feeding port.

[0009] The crushing edges of the present invention can process raw materials adhered with soil, play a self-cleaning role during the crushing process, ensure the stability of the crushing effect, and are more conducive to the crushing of raw materials.

[0010] Further, the crushing edges of the first cushion block and the second cushion block are staggered front and back.

[0011] The staggered crushing edges of the first cushion block and the second cushion block can enable raw materials with a diameter greater than half of the length of the cushion block to be impacted by at least one crushing edge, be quickly crushed, and improve the crushing effect.

[0012] Further, the feeding port is located at the front of the housing, the lower end of the housing is provided with a high-hardness impurity discharge port located behind the crushed material discharge port, the second sides of the first cushion block and the second cushion block are both larger than the third sides of the first cushion block and the second cushion block, the second sides of the first cushion block are all inclined towards the rear end direction of the crushing chamber, and the second sides of the second cushion block are all inclined towards the high-hardness impurity discharge port direction.

[0013] The second side and the third side can enable high-hardness impurities to quickly transfer towards the high-hardness impurity discharge port direction, distinguish high-hardness impurities from normal raw materials, prevent them from mixing into the raw materials, and can extend the service life of the first cushion block and the second cushion block at the position of crushing raw materials.

[0014] Further, the included angle between the first side and the second side is 10° - 20°, and the included angle formed between the second side and the third side is 90° - 100°.

[0015] This parameter setting can slow down the wear of the first cushion block and the second cushion block, extend the service life while ensuring the crushing effect, and magnify the function of the second side and the third side in transferring high-hardness impurities, enabling high-hardness impurities to be quickly transferred.

[0016] Further, there is a spacing between the rear end of the rotor disc and the rear end of the impact plate and the vertical plane where the rear inner wall of the high-hardness impurity discharge port is located, and the upper end of the front side plate of the high-hardness impurity discharge port is inclined towards the crushed material discharge port direction.

[0017] When the high-hardness impurities are transferred to above the high-hardness impurity discharge port by the second side and the third side, they will freely fall because there is no impact from the hammer head and the impact plate.

[0018] Further, a first threaded hole is provided on the regular quadrangular prism of the first cushion block. The first cushion block is connected to the hammer head by a bolt that passes through the hammer head and is screwed into the first threaded hole. A second threaded hole is provided on the regular quadrangular prism of the second cushion block. The second cushion block is connected to the impact plate by a bolt that passes through the impact plate and is screwed into the second threaded hole.

[0019] Further, a curtain-shaped blocking mechanism is provided inside the feed inlet of the present invention. The blocking mechanism is composed of a plurality of blocking chains that are articulated on the upper side wall of the feed inlet at intervals along the length direction of the feed inlet. The blocking chain is a chain-shaped structure formed by sequentially articulating a plurality of connecting rods. The central axis of the hinge shaft where each adjacent two connecting rods are articulated is parallel to the central axis of the main shaft. Disc-shaped counterweight blocks are rotatably connected to both ends of each hinge shaft.

[0020] The disc-shaped counterweight blocks can roll on the raw materials, preventing the raw materials from snagging the blocking chains.

[0021] The blocking chain of the present invention can block the splashing of materials in the crushing chamber without affecting the entry of raw materials into the crushing chamber. At the same time, the blocking chain itself will not swing randomly due to the impact of materials. The blocking chain of the present invention can only swing in the plane restricted by the hinge shaft and will not be entangled with other blocking chains, ensuring the safe use of the present invention.

[0022] Further, the length of the blocking chain is greater than the width of the feed inlet, and the masses of the plurality of counterweight blocks on the same blocking chain gradually decrease from the middle to both ends.

[0023] Further, a positioning groove and a limiting ring are provided on the main shaft. A positioning rib that extends into the positioning groove is provided on the rotor disc. The positioning rib and the limiting ring fix the position of the rotor disc relative to the main shaft.

[0024] Further, a plurality of impact plates are provided in the crushing chamber. The upper end of each impact plate is articulated to the inner wall of the crushing chamber. The output shaft of a positioning oil cylinder is articulated to the middle of the side surface of each impact plate facing the inner wall of the crushing chamber. The positioning oil cylinder is connected to the outer wall of the housing. The output shaft of the positioning oil cylinder passes through the housing and extends into the crushing chamber. A strip-shaped hole for the output shaft of the positioning oil cylinder to pass through is provided on the housing.

[0025] By the above technical solutions, the beneficial effects of the present invention are as follows:

[0026] The crushing edges of the present invention can process raw materials adhered with soil, play a self-cleaning role during the crushing process, ensure the stability of the crushing effect, and are more conducive to the crushing of raw materials.

[0027] The present invention can automatically remove high-hardness impurities in raw materials without expensive detection and screening equipment, without distinguishing between iron parts, manganese metals or high-hardness stones, etc., and without manual removal after shutdown, ensuring that the crusher continues to work with high efficiency.

[0028] The crushing edge formed by the first cushion block and the second cushion block of the present invention can impact the raw materials, and has a stronger crushing effect compared with the flat lining plate in the prior art.

[0029] The present invention can quickly crush medium-hardness limestone and discharge it from the crushing material discharge port, and forcibly transfer high-hardness impurities to quickly move them out of the crushing area and discharge them from the high-hardness impurity discharge port, extending the service life of the first cushion block and the second cushion block in the raw material crushing area.

[0030] The blocking mechanism of the present invention can effectively prevent the splashing of materials in the crushing chamber, can quickly respond to the impact caused by the splashing of materials, and the blocking chains will not form a state of entanglement with each other, having more application advantages than the iron chains in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the present invention;

[0032] Figure 2 is a front sectional view of the present invention;

[0033] Figure 3 is Figure 2 the A-A sectional view of

[0034] Figure 4 is a schematic structural diagram of the connection between the main shaft, rotor disc, hammer head and the first cushion block of the present invention;

[0035] Figure 5 is a position relationship diagram of the main shaft, rotor disc, hammer head and the counterattack plate of the present invention.

[0036] Figure 6 is Figure 5 the B-B view of

[0037] Figure 7 is Figure 6 the enlarged view of part C of

[0038] Figure 8 is a schematic structural diagram of the blocking chain of the present invention.

[0039] The reference numerals in the drawings are: 1, housing; 2, crushing chamber; 3, main shaft; 4, rotor disc; 5, positioning groove; 6, limiting ring; 7, positioning rib; 8, hammer head; 9, first cushion block; 10, counter-attack plate; 11, positioning oil cylinder; 12, second cushion block; 13, crushing rib; 14, feed inlet; 15, crushed material discharge port; 16, high-hardness impurity discharge port; 17, baffle chain; 18, counterweight block. Detailed implementation manners

[0040] The present invention will be further described below in conjunction with the drawings and the detailed implementation manners:

[0041] It should be noted that the directional terms such as "front", "rear", "left", "right", "up", "down", "bottom surface" and "top surface" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0042] As Figures 1 to 4 shown, a crushing device for cement production raw materials includes a housing 1. There is a crushing chamber 2 inside the housing 1. A main shaft 3 is installed in the crushing chamber 2. A rotor disc 4 is connected to the main shaft 3. Hammer heads 8 are arranged on the rotor disc 4. First cushion blocks 9 are arranged on the hammer heads 8. A counter-attack plate 10 is movably connected to the inner wall of the crushing chamber 2. Second cushion blocks 12 are arranged on the side of the counter-attack plate 10 facing the rotor disc 4;

[0043] Both the first cushion block 9 and the second cushion block 12 are integrally formed regular pentagonal prism structures composed of one side surface of a regular triangular prism and one side surface of a regular quadrangular prism. The three side surfaces of the regular triangular prism are respectively the first side surface, the second side surface and the third side surface. The first side surface coincides with one side surface of the regular quadrangular prism. The regular quadrangular prism of the first cushion block 9 is detachably connected to the hammer head 8. The second side surface and the third side surface of the first cushion block 9 form a crushing rib 13 with a counterclockwise orientation. The second cushion block 12 and the first cushion block 9 have the same shape and size. The regular quadrangular prism of the second cushion block 12 is detachably connected to the counter-attack plate 10. The second side surface and the third side surface of the regular triangular prism of the second cushion block 12 form a crushing rib 13 facing the rotor disc 4;

[0044] The upper end of the housing 1 is provided with a feed inlet 14, and the lower end of the housing 1 is provided with a crushed material discharge port 15 corresponding to the feed inlet 14.

[0045] The crushing ribs of the present invention can impact the raw materials. Compared with the flat cushion blocks in the prior art, the crushing effect is stronger. The raw materials to be crushed first come into contact with the crushing ribs. And because the contact area between the crushing ribs and the raw materials is small and the impact intensity is large, it is more conducive to the crushing of the raw materials.

[0046] After the first cushion block and the second cushion block of the present invention are provided with crushing edges, since the raw materials still have a tendency to slide along the crushing edges after being crushed by the crushing edges, the soil or other materials contaminated on the crushing edges can be impacted and dropped, so as to ensure that the edges and corners of the crushing edges will not adhere to the soil. Compared with the flat cushion blocks in the prior art whose impact force is weakened and the crushing effect is reduced after being adhered with soil or other materials, the present invention has a self-cleaning effect.

[0047] The crushing edges 13 of the first cushion block 9 and the crushing edges 13 of the second cushion block 12 are staggered front and back.

[0048] When the ore is doped with high-hardness impurities, such as iron parts, manganese metal or high-hardness stones, since the particles of the impurities are not large, but have high hardness and high wear, it will cause the crusher to wear too fast, and in severe cases, the crusher will be stuck. In addition, the crushed materials will have subsequent effects on the grinding mill.

[0049] Many manufacturers will be equipped with an electromagnetic iron removal device on the conveyor belt in front of the crusher to remove iron parts, and then use a metal detector to detect other non-magnetic metals. When detected, the machine will stop and the workers will remove other metals manually. However, such operations not only affect the production efficiency, but also require expensive equipment and cannot remove high-hardness stones.

[0050] Compared with the conventional method of making the angle of the crushing edge sharper or making the second side and the third side affect each other to increase the number of impacts of the raw materials, the present invention makes another improvement to the first cushion block and the second cushion block, and forms a special effect of removing high-hardness impurities: as Figures 5 to 7 As shown, in this embodiment, the feed inlet 14 is arranged at the front part of the housing. The counter-attack plate between the feed inlet 14 and the crushed material discharge port 15, the second cushion block on the counter-attack plate, the hammer head, and the area where the first cushion block on the hammer head is located are the crushing area. A high-hardness impurity discharge port 16 is provided at the lower end of the housing 1 at the rear side of the crushed material discharge port 15. The second sides of the first cushion block 9 and the second cushion block 12 are both larger than the third sides of the first cushion block 9 and the second cushion block 12. The second sides of the first cushion block 9 are all inclined towards the rear end direction of the crushing chamber 2, and the second sides of the second cushion block 12 are all inclined towards the direction of the high-hardness impurity discharge port 16.

[0051] The second side face is larger than the third side face, and the second side faces of the first cushion block and the second cushion block are both inclined backward. When the second side face and the third side face come into contact with a metal part or a high-hardness stone, instead of being vertically struck by the hammer head towards the counterattack plate, the high-hardness impurities can be bounced to the side. And during the multiple striking processes between the hammer head and the counterattack plate, they bounce repeatedly and move towards the end of the housing, and fall from the high-hardness impurity discharge port. Therefore, the present invention can automatically discharge high-hardness impurities without expensive iron removal and detection equipment, and there is no need to distinguish iron parts, manganese metals or high-hardness stones, etc., nor is it necessary to manually remove them after stopping the machine, ensuring that the crusher works continuously with high working efficiency.

[0052] The raw materials for normal crushing in the present invention are discharged from the crushed material discharge port. The second side face and the third side face transfer the high-hardness impurities and avoid the crushing area. The crushing area refers to: the raw materials to be crushed between the hammer head and the counterattack plate and the corresponding first cushion block and second cushion block of this part of the raw materials, slowing down the wear rate of the area corresponding to the raw materials to be crushed. Even if the high-hardness impurities are broken due to strong impact, the broken high-hardness impurities will not be mixed into the already crushed raw materials. On the one hand, it avoids the aggravation of wear of the first cushion block and the second cushion block in the crushing area, and on the other hand, it also provides safety guarantee for the subsequent grinding process of the mill.

[0053] The included angle between the first side face and the second side face is 10° to 20°, and the included angle formed between the second side face and the third side face is 90° to 100°.

[0054] The crushing edge is a right angle or an obtuse angle slightly larger than a right angle, which can reduce the wear rate and increase the service life on the premise of strong crushing. As Figure 7 shown, the included angle between the third side face and the first side face is about 60° to 80°. When the material contacts the third side face, the striking force of the third side face on the material is not large. More importantly, it makes the material slide along the third side face towards the second side face of the adjacent first cushion block, and then the second side face impacts the material, making the material fly away from the hammer head, so that as many high-hardness impurities as possible are impacted by the second side face and move towards the rear end of the present invention, improving the function of transferring high-hardness impurities. In this way, one less high-hardness impurity discharge port can be set, and the high-hardness impurities and the raw materials to be normally crushed are separated within a shorter distance, reducing the length of the equipment and the design and processing difficulty.

[0055] There is a spacing between the rear end of the rotor disc 4 and the rear end of the counterattack plate 10 and the vertical plane where the rear end inner wall of the high-hardness impurity discharge port 16 is located. The upper end of the front side plate of the high-hardness impurity discharge port 16 is inclined towards the crushed material discharge port 15.

[0056] The first prism block 9 is provided with a first threaded hole. The first prism block 9 is connected to the hammerhead 8 by a bolt that passes through the hammerhead 8 and is screwed into the first threaded hole. The second prism block 12 is provided with a second threaded hole. The second prism block 12 is connected to the impact plate 10 by a bolt that passes through the impact plate 10 and is screwed into the second threaded hole.

[0057] Since the second side of the present invention is different from that of the conventional cushion block in terms of installation and inclination direction, there is a possibility of inclined splashing when the raw materials of the present invention are re-crushed. When the raw materials are inclined and splashed and impact the grid chain in the feeding port, if a conventional iron chain is installed, it is possible that the iron chain is impacted and swings irregularly, and is entangled with the adjacent front and rear iron chains, and finally loses the grid function.

[0058] As Figure 1 and Figure 8 As shown, a curtain-like grid mechanism is provided inside the feeding port 14. The grid mechanism is composed of a plurality of grid chains 17 that are articulated on the upper side wall of the feeding port 14 at intervals along the length direction of the feeding port 14. The grid chain 17 is a chain-like structure formed by sequentially articulating a plurality of connecting rods. The central axis of the hinge shaft where each adjacent two connecting rods are articulated is parallel to the central axis of the main shaft 3. Disc-shaped counterweight blocks 18 are rotatably connected to both ends of each hinge shaft.

[0059] The grid chain of the present invention can block the splashing of materials in the crushing chamber without affecting the entry of raw materials into the crushing chamber. At the same time, the grid chain itself will not swing irregularly due to the impact of materials. The grid chain of the present invention can only swing in the plane restricted by the hinge shaft and will not be entangled with other grid chains, and the situation of grid failure will not occur, ensuring the use safety of the present invention.

[0060] The length of the grid chain 17 is greater than the width of the feeding port 14. The masses of the plurality of counterweight blocks 18 on the same grid chain 17 gradually decrease from the middle to the upper and lower ends. For example, the mass of the counterweight block 18 located in the middle of the grid chain 17 is 2 kg, and the mass of the counterweight blocks 18 located at the upper and lower ends of the grid chain 17 is 0.2 kg.

[0061] The counterweight blocks make the middle of the grid chain heavy and the ends light, making the inertia of the ends smaller, which is enough to affect the entry of raw materials from the feeding port into the crushing chamber. When the splashed materials with smaller mass impact the grid chain, the inertia of the middle part is large, making the swing range of the grid chain small, and it can avoid a large gap between adjacent two grid chains. When a large-sized broken block impacts and causes a large swing in the middle of the grid chain, because the inertia of the lower grid chain is small, the lower end of the grid chain can quickly curl upwards, surround the outside of the splashed materials, and then loosen again, avoiding the splashed materials flying out through the gap between adjacent two grid chains and injuring people, further ensuring the use safety of the present invention.

[0062] A positioning groove 5 and a limiting ring 6 are provided on the main shaft 3. A positioning rib 7 extending into the positioning groove 5 is provided on the rotor disk 4. The positioning rib 7 and the limiting ring 6 fix the position of the rotor disk 4 relative to the main shaft 3.

[0063] A plurality of impact plates 10 are provided in the crushing chamber 2. The upper end of each impact plate 10 is hinged to the inner wall of the crushing chamber 2. The output shaft of a positioning oil cylinder 11 is hinged to the middle of one side surface of each impact plate 10 facing the inner wall of the crushing chamber 2. The positioning oil cylinder 11 is connected to the outer wall of the housing 1. The output shaft of the positioning oil cylinder 11 passes through the housing 1 and extends into the crushing chamber 2. A strip-shaped hole for the output shaft of the positioning oil cylinder 11 to pass through is provided on the housing 1.

[0064] The working principle of the present invention is as follows: The raw material enters the crushing chamber 2 from the feed inlet 14, is impacted by the hammer head 8 in the crushing chamber 2 and flies towards the impact plate 10, is impacted again on the impact plate 10 and returns, and is impacted by the hammer head 8 again and flies towards the impact plate 10. When the raw material comes into contact with the hammer head 8, the crushing edge 13 of the first cushion block 9 on the hammer head 8 first contacts the raw material. The contact area between the crushing edge 13 and the raw material is small, and the impact strength is large, which can quickly crush the raw material. Moreover, the raw material with a diameter larger than the length of the first cushion block 9 will be impacted by a plurality of crushing edges 13, and the crushing effect is better.

[0065] When the raw materials are sometimes mixed with impurities such as iron parts, manganese metal parts or cobblestones, these impurities are usually mixed in during the raw material mining or transportation process. They are small in volume, high in hardness and difficult to remove. In the prior art, an electromagnetic iron remover and a metal detector are usually added to the conveyor belt in front of the crushing equipment. However, the present invention can automatically remove high-hardness impurities without these devices. When high-hardness impurities enter, due to their small volume, they are very likely to contact the second side of the first cushion block 9. Even if they contact the third side of the first cushion block 9, there will be no obvious impact effect because the angle between the third side and the first side is too large. The high-hardness impurities are more likely to slide along the third side and be impacted by the second side. When the second side impacts the high-hardness impurities, the high-hardness impurities fly towards the impact plate 10 in an inclined direction towards the rear end of the crushing chamber 2 and impact on the second cushion block 12. At this time, the second side and the third side of the second cushion block 12 will also impact the high-hardness impurities, and it is also the second side that makes the impurities incline towards the rear end direction of the crushing chamber. After repeated impacts like this, the high-hardness impurities fly out between the rear ends of the rotor disc 4 and the impact plate 10 and fall from the high-hardness impurity discharge port 16. The normally crushed raw materials, due to crushing energy absorption (the collision between the high-hardness impurities and the first cushion block 9 and the second cushion block 12 is approximately an elastic collision, while the collision between the normally crushed raw materials and the first cushion block 9 and the second cushion block 12 is an inelastic collision), although they also move a certain distance towards the rear end of the crushing chamber 2 (this moving distance is generally 3 - 5 times the length of the first cushion block), the moving distance is small and they cannot bounce repeatedly like the high-hardness impurities and move such a long distance. Eventually, they will be discharged from the crushed material discharge port 15.

[0066] Since the distance between the crushing edges 13 of two adjacent first cushion blocks 9 or the distance between the crushing edges 13 of two adjacent second cushion blocks 12 in the present invention is fixed, that is, the raw materials with a diameter larger than the distance between two adjacent crushing edges 13 are at least impacted by one crushing edge 13. Even if the diameter is smaller than the distance between the crushing edges 13 of the two first cushion blocks 9 and does not contact the crushing edge 13 of the first cushion block 9, it will still be impacted and crushed by the crushing edge 13 of the second cushion block 12 on the impact plate 10 because the crushing edges 13 of the first cushion block 9 and the second cushion block 12 are misaligned. This can effectively control the maximum particle size of the raw materials and ensure the normal operation of the subsequent mill.

[0067] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Without departing from the spirit of the present invention, that is, within the scope of disclosure, various deformations can be made to the technical solutions of the present invention.

Claims

1. A crushing device for cement production raw materials, comprising a housing (1). There is a crushing chamber (2) inside the housing (1). A main shaft (3) is installed in the crushing chamber (2). A rotor disc (4) is connected to the main shaft (3). Hammer heads (8) are provided on the rotor disc (4). First cushion blocks (9) are arranged on the hammer heads (8). A counter-attack plate (10) is movably connected to the inner wall of the crushing chamber (2). Second cushion blocks (12) are arranged on the side surface of the counter-attack plate (10) facing the rotor disc (4). It is characterized in that: Both the first cushion blocks (9) and the second cushion blocks (12) are integrally formed regular pentagonal prism structures composed of one side surface of a regular triangular prism and one side surface of a regular quadrangular prism. The three side surfaces of the regular triangular prism are respectively the first side surface, the second side surface and the third side surface. The first side surface coincides with one side surface of the regular quadrangular prism. The regular quadrangular prism of the first cushion block (9) is detachably connected to the hammer head (8). The second side surface and the third side surface of the first cushion block (9) form a crushing edge (13) facing counterclockwise. The second cushion blocks (12) and the first cushion blocks (9) are identical in shape and size. The regular quadrangular prism of the second cushion block (12) is detachably connected to the counter-attack plate (10). The second side surface and the third side surface of the regular triangular prism of the second cushion block (12) form a crushing edge (13) facing the rotor disc (4); The upper end of the housing (1) is provided with a feed inlet (14), and the lower end of the housing (1) is provided with a crushed material discharge outlet (15) corresponding to the feed inlet (14); The feed inlet (14) is located at the front of the housing. The lower end of the housing (1) is provided with a high-hardness impurity discharge outlet (16) behind the crushed material discharge outlet (15). The second side surfaces of the first cushion blocks (9) and the second cushion blocks (12) are both larger than the third side surfaces of the first cushion blocks (9) and the second cushion blocks (12). The second side surfaces of the first cushion blocks (9) are all inclined towards the rear end direction of the crushing chamber (2). The second side surfaces of the second cushion blocks (12) are all inclined towards the direction of the high-hardness impurity discharge outlet (16); The included angle between the first side surface and the second side surface is 10° - 20°, and the included angle formed between the second side surface and the third side surface is 90° - 100°.

2. The crushing device for a cement production raw material according to claim 1, wherein, The crushing edges (13) of the first cushion blocks (9) and the crushing edges (13) of the second cushion blocks (12) are staggered front and back.

3. A crushing device for cement production raw materials according to claim 1, characterized in that, There are intervals between the rear ends of the rotor disc (4) and the rear ends of the counter-attack plate (10) and the vertical plane where the inner wall of the rear end of the high-hardness impurity discharge outlet (16) is located. The upper end of the front side plate of the high-hardness impurity discharge outlet (16) is inclined towards the direction of the crushed material discharge outlet (15).

4. A crushing device for cement production raw materials according to claim 1, characterized in that, The regular quadrangular prism of the first cushion block (9) is provided with a first threaded hole. The first cushion block (9) is connected to the hammer head (8) by bolts passing through the hammer head (8) and screwed into the first threaded hole. The regular quadrangular prism of the second cushion block (12) is provided with a second threaded hole. The second cushion block (12) is connected to the counter-attack plate (10) by bolts passing through the counter-attack plate (10) and screwed into the second threaded hole.

5. A crushing device for raw materials of cement production according to claim 1, characterized in that, A curtain-like blocking mechanism is provided inside the feeding port (14). The blocking mechanism is formed by a plurality of blocking chains (17) being hinged to the upper side wall of the feeding port (14) at intervals along the length direction of the feeding port (14). The blocking chain (17) is a chain-like structure formed by sequentially hinging a plurality of connecting rods. The central axis of the hinge shaft where every two adjacent connecting rods are hinged is parallel to the central axis of the main shaft (3). Disc-shaped counterweight blocks (18) are rotatably connected to both ends of each hinge shaft.

6. The crushing device for a cement production raw material according to claim 5, characterized in that, The length of the blocking chain (17) is greater than the width of the feeding port (14). The masses of the plurality of counterweight blocks (18) on the same blocking chain (17) gradually decrease from the middle to both ends.

7. A crushing device for raw materials of cement production according to claim 1, characterized in that, A positioning groove (5) and a limiting ring (6) are provided on the main shaft (3). A positioning rib (7) extending into the positioning groove (5) is provided on the rotor disc (4). The positioning rib (7) and the limiting ring (6) fix the position of the rotor disc (4) relative to the main shaft (3).

8. A crushing device for raw materials for cement production according to claim 1, characterized in that, A plurality of impact plates (10) are provided inside the crushing chamber (2). The upper end of each impact plate (10) is hinged to the inner wall of the crushing chamber (2). The output shaft of a positioning oil cylinder (11) is hinged to the middle of one side surface of each impact plate (10) facing the inner wall of the crushing chamber (2). The positioning oil cylinder (11) is connected to the outer wall of the housing (1). The output shaft of the positioning oil cylinder (11) penetrates through the housing (1) and extends into the crushing chamber (2). A strip-shaped hole for the output shaft of the positioning oil cylinder (11) to pass through is provided on the housing (1).

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