CN112791784A - Middle section cement clinker device in small, broken bits - Google Patents

Abstract

The invention discloses a middle-section cement clinker fine crushing device, which relates to the technical field of cement processing and aims to solve the technical problem that the material crushing size is adjustable.

Description

Middle section cement clinker device in small, broken bits

Technical Field

The invention relates to the technical field of cement clinker processing, in particular to a middle section cement clinker fine crushing device.

Background

The cement clinker is prepared with limestone, clay and iron material as main material and through mixing in proper proportion to form raw material, burning to melt partially or completely and cooling to obtain semi-finished product. In the cement burning process, high-temperature cement clinker needs to enter a middle-section crusher or a tail-end crusher after being cooled by a cooler, the particle size of the crushed material is generally controlled to be 30mm, and compared with tail-end crushing, the efficiency of the cooler is improved by middle-section roller crushing, and the clinker temperature of the cooler is reduced. The working principle of the middle roller crusher mainly depends on the gravity of cement clinker falling into the roller crusher and the friction force between the cement clinker and the rollers, so that the cement clinker is bitten into the rollers rotating oppositely to be crushed.

The utility model patent with the publication number of "CN 203598859" and the name of "a high-temperature roller crusher" introduces a crusher, which comprises a transmission device, a shell, a crushing unit arranged in the shell, and a speed measuring device, wherein the crushing unit is composed of at least a pair of rollers rotating in opposite directions; the transmission device is connected with the crushing unit to drive the rollers to rotate; speed sensor is connected with crushing unit, for prior art, the utility model has the advantages of it is following: the high-temperature cement clinker aggregate crusher can efficiently crush high-temperature cement clinker aggregates at 500-600 ℃, fully recover and recycle the heat of the clinker, assist combustion to reduce system heat consumption, and has the functions of energy conservation and emission reduction, but the crushing effect of the high-temperature cement clinker aggregate crusher can only realize crushing of materials with the same particle size, and the high-temperature cement clinker aggregate crusher is strong in unicity and cannot adjust the particle size.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a middle section cement clinker fine crushing device for solving the technical problems that the material particle size is single and online adjustment cannot be realized in the prior art.

In order to solve the problems, the invention adopts the following technical scheme:

the middle section cement clinker fine crushing device comprises a front section grate bed (1), a rear section grate bed (2) and an external shell (4), wherein a grinding bed (3) is arranged between the front section grate bed (1) and the rear section grate bed (2), a roller device is arranged on the upper surface of the grinding bed (3), the front section grate bed (1), the rear section grate bed (2), the grinding bed (3) and the roller device are all located inside the external shell (4), and a gap adjusting device is arranged between the roller device and the grinding bed (3).

By adopting the scheme, the large cement clinker enters the grinding bed (3) through the front-section grate bed (1), is crushed under the action of the roller device, and the granularity of the material can be adjusted through the gap adjusting device between the roller device and the grinding bed (3), so that the material is crushed into smaller particles, is ground under high pressure, improves the yield, enhances the efficiency, saves energy and reduces consumption; the front section grate bed (1), the rear section grate bed (2), the grinding bed (3) and the roller device are connected with the external shell (4) through bolts, heat generated in the fine crushing process is collected and recycled, and meanwhile, the environment pollution caused by dust generated in the fine crushing process can be avoided.

Preferably, the roller device comprises a roller body (5) and a rotating shaft (6), wherein the length of the rotating shaft (6) is greater than that of the roller body (5), the roller body (5) is sleeved on the rotating shaft (6) and fixedly connected with the rotating shaft (6), two ends of the rotating shaft (6) extend out of the outer shell (4), two ends of the rotating shaft (6) are respectively sleeved with a bearing (7) and located on the outer side of the outer shell (4), and bearing seats (8) are respectively arranged on the outer sides of the two bearings (7).

By adopting the scheme, the bearing seat (8) is arranged on the outer side of the bearing (7), the bearing seat (8) is favorable for fixing the bearing (7) and is simultaneously connected with the gap adjusting device, and the synchronous motion of the roller device and the gap adjusting device can be realized.

The end, extending out of the outer shell (4), of the rotating shaft (6) is of a solid structure, one side, far away from the outer shell (4), of the solid structure is fixedly connected with the transmission device (17), the other portion of the solid structure is of a hollow structure, and one side, far away from the outer shell (4), of the hollow structure is fixedly connected with the shaft cooling system (18).

By adopting the scheme, one side of the solid structure of the rotating shaft (6), which is far away from the outer shell (4), is fixedly connected with a transmission device (17), the transmission device (17) is a motor and a speed reducer, and the transmission device (17) provides power for the rotation of the rotating shaft (6); one side and axle cooling system (18) fixed connection of outside casing (4) are kept away from to rotation axis (6) hollow structure, axle cooling system (18) adopt prior art's forced air cooling or water-cooling to realize cooling rotation axis (6) and bearing (7), prevent that bearing (7) high temperature from influencing its performance.

Preferably, the surface of the roller body (5) is in a flower shape, a rhombus shape, a hexagon shape, a rhombus shape, a round dot shape, a sawtooth shape, a herringbone shape or a transverse stripe shape.

Through adopting above-mentioned scheme, it is big to the material interlock angle to do benefit to the roller, and the material dynamics of taking off of multiplicable roller improves extrusion efficiency, improves roll body (5) wearability, and wearing and tearing begin at first from various shapes, do benefit to and carry out effectual protection, reinforcing life to roll body (5).

Preferably, there are at least two of said roll means.

Preferably, the gap adjusting device is a hydraulic system which is symmetrically arranged on two sides of the outer shell (4) and is perpendicular to the grinding bed (3), the hydraulic system comprises a hydraulic cylinder (9), the rear end of the hydraulic cylinder (9) is fixedly connected with the outer shell (4) through a connecting plate (19), and the front end of a rod part of the hydraulic cylinder (9) is fixedly connected with the top surface of the bearing seat (8).

By adopting the scheme, the hydraulic cylinder (9) is perpendicular to the grinding bed (3), the rod part of the hydraulic cylinder (9) drives the roller device to move towards the grinding bed (3) under the action of hydraulic oil, so that the gap between the roller device and the grinding bed (3) can be adjusted, meanwhile, a hydraulic system provides high pressure for the roller device, the materials can be crushed to be smaller in particle size by utilizing high-pressure fine crushing of the roller, the heat dissipation is facilitated, the heat efficiency of the rotary kiln is improved, the grindability of the materials is improved, the power consumption of clinker grinding is reduced, and the quality of clinker is improved.

Preferably, clearance adjustment device is screw rod device, screw rod device symmetry set up in outside casing (4) both sides and with grinding bed (3) mutually perpendicular, screw rod device includes screw rod (10), screw rod (10) are through connecting plate (19) and outside casing (4) fixed connection, round hole (11) have been seted up to connecting plate (19) one end, screw rod (10) cover is established in round hole (11), screw rod (10) one end and bearing frame (8) top surface fixed connection, other end threaded connection have nut (12), nut (12) are located the upper surface of connecting plate (19), screw rod (10) outside cover is equipped with spring (13), spring (13) one end links to each other with connecting plate (19) bottom surface, and the other end links to each other with bearing frame (8) top surface.

By adopting the scheme, the clearance adjustment is realized by matching the screw rod (10), the nut (12) and the spring (13), the screw rod (10) is vertical to the grinding bed (3), when the clearance between the adjusting roller device and the grinding bed (3) is enlarged, the nut (12) is clockwise turned, when the nut (12) is contacted with the connecting plate (19), the nut (12) cannot continuously move downwards due to the fixed position of the connecting plate (19), at the moment, the screw rod (10) moves upwards due to the powerful action, the roller device is driven to move upwards at the same time, the clearance between the roller device and the grinding bed (3) is enlarged, and the spring (13) is gradually compressed to play a buffering role; when the gap between the adjusting roller device and the grinding bed (3) is reduced, the screw (10) moves downwards under the action of the gravity of the screw (10) and the roller device by turning the nut (12) anticlockwise, so that the gap between the roller device and the grinding bed (3) is reduced gradually, and the material is crushed to be finer.

Preferably, outside casing (4) both sides still symmetry are equipped with stop device, stop device and outside casing (4) fixed connection, stop device includes limiting plate (14), limiting groove (15) have been seted up in limiting plate (14) in the direction of perpendicular to grinding bed, rotation axis (6) both ends are established respectively two in limiting groove (15) and with limiting groove (15) sliding connection.

Through adopting above-mentioned scheme, the during operation, hydraulic cylinder (9) pole portion moves to the direction of grinding bed (3) under the effect of hydraulic oil, drive bearing frame (8) motion simultaneously, bearing frame (8) link to each other with rotation axis (6) through bearing (7), thereby drive rotation axis (6) to the direction motion of grinding bed (3), the both ends of rotation axis (6) are established respectively in two spacing grooves (15), the direction of motion of spacing groove (15) restriction rotation axis (6), prevent to take place the displacement.

Preferably, the grinding bed (3) is an arc-shaped surface, the surface of the grinding bed (3) is a wear-resistant layer, the front section grate bed (1) and the rear section grate bed (2) have a certain vertical height difference, and the range of the vertical height difference is 1.5-2.5 m.

Preferably, the grinding bed (3) is a slope surface forming a certain included angle with the front section grate bed (1), the surface of the grinding bed (3) is a wear-resistant layer, a certain vertical height difference exists between the front section grate bed (1) and the rear section grate bed (2), and the range of the vertical height difference is 1.5-2.5 m.

By adopting the scheme, the grinding bed (3) is arranged to be an arc surface or a slope surface, so that cement clinker falls onto the rear-section grate bed (2) under the action of self gravity after being extruded and crushed by the roller device and the grinding bed (3), and the ventilation devices are arranged at the bottoms of the front-section grate bed (1) and the rear-section grate bed (2) in the prior art, so that the cement clinker is cooled rapidly, and the clinker temperature of a cooler is reduced; the vertical height difference between the front section grate bed (1) and the rear section grate bed (2) is set to be 1.5-2.5m, so that the arrangement of roller devices with proper quantity on the surface of the grinding bed (3) is facilitated, the cost is increased when the height difference is larger than 2.5m, and the structure of the roller devices on the grinding bed (3) is reduced when the height difference is smaller than 1.5m, so that the fine crushing work is not facilitated.

Compared with the prior art, the invention has the beneficial effects that:

1. the large cement clinker enters the grinding bed (3) through the front-section grate bed (1), is crushed under the action of the roller device, and the granularity of the material can be adjusted by arranging the gap adjusting device between the roller device and the grinding bed (3), so that the material is crushed into smaller particles, is ground under high pressure, improves the yield and the efficiency, saves energy and reduces consumption;

2. a hydraulic cylinder (9) of the hydraulic system extends downwards under the action of hydraulic oil and drives the roller device to move downwards, so that the gap between the roller device and the grinding bed (3) is reduced, and online adjustment is realized;

3. the adjusting mode of the screw device enables the screw (10) to move up and down through turning the nut (12), so that the roller device is driven to move up and down, and the adjusting function is realized;

4. the shaft cooling system (18) is arranged, so that the rotating shaft (6) and the bearing (7) of the roller device can be cooled, and the performance of the bearing (7) is prevented from being influenced by overhigh temperature;

5. the technical scheme of the invention can realize crushing of materials into smaller particles, high-pressure grinding, yield improvement and efficiency improvement, energy conservation and consumption reduction, online adjustment of the granularity of finished products, improvement of the heat efficiency of the rotary kiln, contribution to calcination of the materials in the kiln and reduction of the power consumption of clinker grinding.

Drawings

FIG. 1 is a schematic view of the overall structure of a middle cement clinker fine crushing device according to the present invention;

FIG. 2 is a schematic diagram of an embodiment of a middle cement clinker crushing device according to the present invention;

FIG. 3 is a side view of a middle section cement clinker crushing apparatus according to the present invention;

fig. 4 is a second structural diagram of an embodiment of a middle cement clinker fine crushing device provided by the invention.

In the figure: 1-front section grate bed, 2-rear section grate bed, 3-grinding bed, 4-external shell, 5-roller body, 6-rotating shaft, 7-bearing, 8-bearing seat, 9-hydraulic cylinder, 10-screw, 11-round hole, 12-nut, 13-spring, 14-limiting plate, 15-limiting groove, 16-sealing device, 17-transmission device, 18-shaft cooling system and 19-connecting plate.

Detailed Description

The invention will be described in detail by way of example with reference to the accompanying drawings, which form a part hereof, and in which it is to be understood that the described embodiments are by way of illustration only, and not by way of limitation.

Example 1:

as shown in figure 1, a middle section cement clinker fine crushing device comprises a front section grate bed 1, a rear section grate bed 2 and an outer shell 4, wherein a grinding bed 3 is arranged between the front section grate bed 1 and the rear section grate bed 2, a roller device is arranged on the upper surface of the grinding bed 3, the front section grate bed 1, the rear section grate bed 2, the grinding bed 3 and the roller device are all positioned inside the outer shell 4, a hydraulic system is arranged between the roller device and the grinding bed 3, the hydraulic system is symmetrically arranged on two sides of the outer shell 4 and is mutually vertical to the grinding bed 3, the hydraulic system comprises a hydraulic cylinder 9, the rear end of the hydraulic cylinder 9 is fixedly connected with the outer shell 4 through a connecting plate 19, the front end of the rod part of the hydraulic cylinder 9 is fixedly connected with the top surface of a bearing seat 8, large cement clinker enters the grinding bed through the front section grate bed and is crushed under the action of the roller device, and the hydraulic cylinder, the rod part of the hydraulic cylinder drives the bearing seat 8 to move towards the grinding bed 3 under the action of hydraulic oil, the bearing seat 8 drives the roller device to move, so that the gap between the roller device and the grinding bed 3 can be adjusted, meanwhile, a hydraulic system provides high pressure for the roller device, the materials can be crushed to be smaller in particle size by utilizing high-pressure fine crushing of the roller, the heat dissipation is facilitated, the heat efficiency of the rotary kiln is improved, the grindability of the materials is improved, the power consumption of clinker grinding is reduced, the yield is improved, the effect is increased, and the energy is saved and.

The grinding bed 3 is an arc-shaped surface, the surface of the grinding bed 3 is a wear-resistant layer, the front section grate bed 1 and the rear section grate bed 2 have a certain vertical height difference, the range of the vertical height difference is 1.5-2.5m, the vertical height difference between the front section grate bed and the rear section grate bed is 1.5-2.5m, the arrangement of roller devices with proper quantity on the surface of the grinding bed is facilitated, the cost is increased when the height difference is larger than 2.5m, and the structure of the roller devices on the grinding bed is reduced when the height difference is smaller than 1.5m, so that the fine crushing work is not facilitated.

As shown in fig. 2, a sealing device 16 is fixedly arranged between the roller device and the outer shell 4, the sealing device 16 is an elastic thin steel sheet, the elastic thin steel sheet is at least two layers, the multiple layers of elastic thin steel sheets are arranged in parallel and are connected with the outer shell 4 through bolts, and the sealing device 16 is beneficial to isolating the convection of air inside and outside the outer shell 4, so that the inside of the outer shell 4 is in a completely sealed state, and the stable operation of the equipment is met.

As shown in fig. 2, the roller device includes a roller body 5 and a rotating shaft 6, the roller body 5 is sleeved on the rotating shaft 6 and is fixedly connected with the rotating shaft 6, two ends of the rotating shaft 6 extend out of the outer housing 4, two ends of the rotating shaft 6 are respectively sleeved with bearings 7 and are located outside the outer housing 4, bearing seats 8 are respectively arranged outside the two bearings 7, one end of the rotating shaft 6 extending out of the outer housing 4 is of a solid structure, the rest is of a hollow structure, one side of the rotating shaft 6, which is far away from the outer housing, of the solid structure is fixedly connected with a transmission device 17, the transmission device 17 is a motor and a speed reducer, and the transmission device 17 provides power for rotation of the rotating shaft 6; one side and the axle cooling system 18 fixed connection of outside casing are kept away from to 6 hollow structure of rotation axis, axle cooling system 18 adopts prior art's forced air cooling or water-cooling to realize cooling rotation axis 6 and bearing 7, prevents that bearing 7 high temperature from influencing its performance.

The surface of the roller body 5 is in a flower shape, a rhombus shape, a hexagon shape, a rhombus shape, a dot shape, a zigzag shape, a herringbone shape or a horizontal stripe shape, the pattern surface is favorable for the roller to have a large material occlusion angle, the material scraping force of the roller can be increased, the extrusion efficiency is improved, the wear resistance of the roller body is improved, the abrasion starts from various shapes at first, the effective protection of the roller body 5 is favorably realized, and the service life is prolonged.

As shown in fig. 3, 4 bilateral still symmetries of outside casing are equipped with stop device, stop device and 4 fixed connection of outside casing, stop device includes limiting plate 14, limiting groove 15 has been seted up to limiting plate 14 in the direction of perpendicular to grinding bed 3, 6 both ends of rotation axis are established respectively two in the limiting groove 15 and with limiting groove 15 sliding connection, the during operation, 9 pole portions of hydraulic cylinder move to the direction of grinding bed 3 under the effect of hydraulic oil, drive the motion of bearing frame 8 simultaneously, bearing frame 8 passes through bearing 7 and links to each other with rotation axis 6 to drive the direction motion of rotation axis 6 to grinding bed 3, the both ends of rotation axis 6 are established respectively and are established in two limiting groove 15, and limiting groove 15 limits the direction of motion of rotation axis 6, prevents to take place the displacement.

The working principle is as follows: cement clinker enters a grinding bed 3 through a front section grate bed 1, a transmission device 17 drives a roller device to rotate, hydraulic cylinders 9 symmetrically arranged on two sides of an outer shell 4 are controlled by a control system and extend to a position vertical to the grinding bed 3 at the same time, so that the roller device is driven to move downwards to reduce a gap between the roller device and the grinding bed 3, the gap between the roller device and the grinding bed 3 is adjustable, meanwhile, a hydraulic system provides high pressure for the roller device, the cement clinker is extruded, sheared and crushed between the roller device and the grinding bed 3 and then enters a rear section grate bed 2, a shaft cooling system 18 ensures the cooling effect of a rotating shaft 6 and a bearing 7 system of the roller device, the rotating shaft 6 is connected with the rod part of the hydraulic cylinder 9 through a bearing seat 8, the hydraulic cylinder 9 moves towards the grinding bed 3 while driving the rotating shaft 6 to move, and the rotating shaft, the linear motion is carried out in the axial range of the hydraulic cylinder 9, the transmission device 17 and the roller device carry out the linear motion together, deflection cannot occur, collision with the grinding bed 3 or the external shell 4 cannot occur, and the sealing device 16 is fixed between the external shell 4 and the roller device, so that the isolation of a rolling area and the external environment is ensured, and the stable operation of equipment is further met.

Example 2

The same as example 1, except that: as shown in fig. 4, the clearance adjusting device is a screw device, the screw device is symmetrically arranged on two sides of the outer shell 4, the screw device comprises a screw rod 10, the screw rod 10 is fixedly connected with the outer shell 4 through a connecting plate 19, a round hole 11 is formed in one end of the connecting plate 19, the screw rod 10 is sleeved in the round hole 11, one end of the screw rod 10 is fixedly connected with the top surface of the bearing seat 8, the other end of the screw rod is in threaded connection with a nut 12, the nut 12 is located on the upper surface of the connecting plate, a spring 13 is sleeved on the outer side of the screw rod 10, one end of the spring 13 is connected with the.

The working principle is as follows: cement clinker enters a grinding bed 3 through a front-section grate 1, a transmission device 17 drives a roller device to rotate, when the gap between an adjusting roller device and the grinding bed 3 is enlarged, nuts 12 on two sides of an outer shell 4 are clockwise turned, when the nuts 12 are in contact with a connecting plate 19, the nuts 12 cannot continuously move downwards due to the fixed position of the connecting plate 19, at the moment, a screw 10 moves upwards due to the powerful action, the roller device is driven to move upwards, the gap between the roller device and the grinding bed 3 is enlarged, and a spring 13 is gradually compressed to play a buffering role; when the gap between the adjusting roller device and the grinding bed 3 is smaller, the nuts 12 on the two sides of the outer shell 4 are turned anticlockwise, and under the action of the gravity of the screw 10 and the roller device, the screw 10 moves downwards, the gap between the roller device and the grinding bed 3 is gradually reduced, and therefore the material is crushed more finely.

Example 3

The same as example 1, except that: the grinding bed 3 is a slope surface forming a certain included angle with the front section grate bed 1, the surface of the grinding bed 3 is a wear-resistant layer, a certain vertical height difference exists between the front section grate bed 1 and the rear section grate bed 2, and the range of the vertical height difference is 1.5-2.5 m.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the application concepts of the present invention are equivalent to or changed within the technical scope of the present invention.

Claims (10)

1. The utility model provides a middle section cement clinker fine crushing device, includes anterior segment comb bed (1), back end comb bed (2) and outside casing (4), anterior segment comb bed (1) with be equipped with grinding bed (3) between back end comb bed (2), grinding bed (3) upper surface is equipped with the roll device, anterior segment comb bed (1), back end comb bed (2), grinding bed (3) and roll device all are located inside outside casing (4), its characterized in that: a gap adjusting device is arranged between the roller device and the grinding bed (3).

2. The intermediate cement clinker crushing device of claim 1, wherein: the roller device comprises a roller body (5) and a rotating shaft (6), wherein the length of the rotating shaft (6) is greater than that of the roller body (5), the roller body (5) is sleeved on the rotating shaft (6) and fixedly connected with the rotating shaft (6), two ends of the rotating shaft (6) extend out of the outer shell (4), two ends of the rotating shaft (6) are respectively sleeved with a bearing (7) and located on the outer side of the outer shell (4), and bearing seats (8) are respectively arranged on the outer sides of the two bearings (7).

3. The intermediate cement clinker aggregate crushing device of claim 2, wherein: the end, extending out of the outer shell (4), of the rotating shaft (6) is of a solid structure, one side, far away from the outer shell (4), of the solid structure is fixedly connected with the transmission device, the other portion of the solid structure is of a hollow structure, and one side, far away from the outer shell (4), of the hollow structure is fixedly connected with the shaft cooling system.

4. The intermediate cement clinker aggregate crushing device of claim 3, wherein: the surface of the roller body (5) is in a flower shape, a rhombus shape, a hexagon shape, a rhombus shape, a dot shape, a sawtooth shape, a herringbone shape or a transverse stripe shape.

5. The intermediate cement clinker aggregate crushing device of claim 4, wherein: the number of the roller devices is at least two.

6. The intermediate cement clinker aggregate crushing device of claim 5, wherein: the gap adjusting device is a hydraulic system which is symmetrically arranged on two sides of the outer shell (4) and is perpendicular to the grinding bed (3), the hydraulic system comprises a hydraulic cylinder (9), the rear end of the hydraulic cylinder (9) is fixedly connected with the outer shell (4) through a connecting plate (19), and the front end of the rod part of the hydraulic cylinder (9) is fixedly connected with the top surface of the bearing seat (8).

7. The intermediate cement clinker aggregate crushing device of claim 5, wherein: the utility model discloses a grinding machine, including clearance adjustment device, grinding machine, screw rod device, connecting plate (8), screw rod device symmetry set up in outside casing (4) both sides and with grinding bed (3) mutually perpendicular, screw rod device includes screw rod (10), screw rod (10) are through connecting plate (19) and outside casing (4) fixed connection, round hole (11) have been seted up to connecting plate (19) one end, screw rod (10) cover is established in round hole (11), screw rod (10) one end and bearing frame (8) top surface fixed connection, and another end threaded connection has nut (12), nut (12) are located the upper surface of connecting plate, screw rod (10) outside cover is equipped with spring (13), spring (13) one end links to each other with the connecting plate bottom surface.

8. The intermediate cement clinker crushing device of claim 6 or 7, wherein: outside casing (4) both sides still symmetry are equipped with stop device, stop device and outside casing (4) fixed connection, stop device includes limiting plate (14), limiting groove (15) have been seted up in limiting plate (14) in the direction of perpendicular to grinding bed (3), rotation axis (6) both ends are established respectively two in limiting groove (15) and with limiting groove (15) sliding connection.

9. The intermediate cement clinker aggregate crushing device of claim 8, wherein: the grinding bed (3) is an arc-shaped surface, the surface of the grinding bed (3) is a wear-resistant layer, the front section grate bed (1) and the rear section grate bed (2) have a certain vertical height difference, and the range of the vertical height difference is 1.5-2.5 m.

10. The intermediate cement clinker aggregate crushing device of claim 8, wherein: the grinding bed (3) is a slope surface forming a certain included angle with the front section grate bed (1), the surface of the grinding bed (3) is a wear-resistant layer, a certain vertical height difference exists between the front section grate bed (1) and the rear section grate bed (2), and the range of the vertical height difference is 1.5-2.5 m.

Images