A multi-rotor compound impact grinding machine

Abstract

The present invention provides a multi-rotor composite impact mill, which relates to the field of mining machinery. It is composed of a frame, a feed, a power transmission, a composite impact grinding, a finished product extraction and other parts. The composite impact grinding part is composed of a multi-rotor impact assembly and a counter-impact assembly. The constituent unit of the impact assembly is a standard single rotor. The impact assembly is contained in the counter-impact rotor, and two feed ports are symmetrically arranged at the upper part of the crushing chamber. The finished product is extracted by the extraction pipes on both sides of the top through the exhaust fan, and a negative pressure working state is formed inside the machine. The motor drives the active gear and the surrounding driven gears to rotate, thereby driving the rotor shaft and the impact block to throw the material outward for impact. The bottom end of the central shaft drives the counter-impact rotor to rotate in the opposite direction of the standard single rotor through the reverse reducer to counter-crush the material. The beneficial effects are: the production of the machine can be standardized; the number of standard single rotor configurations can be adjusted to change the hourly output; and the large-scale production needs of the grinding enterprise can be met.

Description

Technical Field

[0001] The invention relates to a multi-rotor composite impact mill in the field of mining machinery, and can be widely used in the sand making and powder making links of brittle materials in mining, metallurgy, chemical industry, building materials and the like. Background Art

[0002] Impact mill is widely used in some powder and sand making enterprises in my country's mining, metallurgy, chemical industry, building materials and other industries due to its energy saving and high efficiency. Its representative equipment is the impact grinding equipment derived from the patent number ZL200620097633.X (frame pre-grinding machine). However, in actual use, due to the use of a single inner rotor to throw outward impact and the outer rotor to counterattack inward, the impact linear velocity of the material thrown by the inner and outer rotors and the volume of the crushing chamber determine the output of the equipment per hour. Due to the limitations of factors such as the rated speed and dynamic balance of the bearing, the inner rotor cannot be infinitely enlarged, which limits the expansion of the equipment's production capacity and cannot meet the requirements of large-scale production of grinding enterprises. For example, the current maximum output of impact grinding micro-powder equipment with inner and outer rotors as impact parts is about 60 tons per hour, while the daily output of many cement companies is now 2,000 to 10,000 tons, that is, the output of the grinding equipment per hour must be more than 100 tons to meet the requirements of large-scale production of these companies. At present, the ball mills used in the grinding production of most large-scale production enterprises have an electricity utilization rate of less than 3%, and the environmental pollution at the production site is serious, and they are in urgent need of upgrading and reconstruction. Summary of the invention

[0003] In view of the current status of the prior art, the present invention provides a multi-rotor compound impact grinding mill for large-scale production of brittle materials such as mining, metallurgy, chemical industry, and building materials. The specific contents are:

[0004] The utility model relates to a multi-rotor compound impact mill, which is composed of a frame, a feed, a power drive, a multi-rotor compound impact mill, a finished product extraction, a lubrication, an operation monitoring and the like.

[0005] The multi-rotor composite impact grinding part is composed of a multi-rotor impact assembly and a counter-impact assembly. The constituent unit of the multi-rotor impact assembly is a standard single rotor. The multi-rotor impact assembly is composed of 2 to 8 standard single rotors arranged around the central axis. The counter-impact assembly is composed of an impact bracket, a conical screen and an impact rotor. The multi-rotor impact assembly is contained in the impact rotor.

[0006] The standard single rotor that makes up the multi-rotor impact assembly unit is composed of a rotor shaft and an impact block. The impact block is divided into 2 to 3 layers. According to the requirements of the product discharge particle size, 3 to 8 impact surfaces are arranged correspondingly in each layer. The number of standard single rotors is arranged according to the equipment output per hour required by the user. 2 to 8 standard single rotors can be evenly distributed. The rotor shaft is vertically parallel to the central axis and surrounds the central axis as the center. The upper end of each rotor shaft is fixed with a driven gear with a key.

[0007] The anti-impact assembly consists of an impact bracket, a conical screen and an impact rotor. The impact bracket is keyed to the output shaft at the lower end of the reversing reducer. The bottom end of the reversing reducer is installed on the central support through a thrust roller bearing. The upper end of the reversing reducer is fixed to the lower support plate of the equipment, and its input shaft end is connected to the central shaft. The impact bracket is a cross bracket with an axial hole in the center formed by wear-resistant alloy steel. The top end is connected to the small opening end of an inverted conical screen punched and rolled with wear-resistant alloy plate. The large opening end of the conical screen is connected to the lower end of a cylindrical impact rotor rolled with wear-resistant alloy plate, and the upper end of the impact rotor is not connected or constrained.

[0008] The action of driving the multi-rotor impact assembly in the power drive part is transmitted to the central shaft by the V-belt pulley of the motor through the V-belt. The central shaft is provided with a driving gear fixed with a key, which then meshes with the driven gears evenly distributed around the periphery and fixed on the standard single rotor shaft, thereby driving the standard single rotor and the impact block to rotate at high speed.

[0009] The power drive part drives the action of the anti-impact component, which is connected to the reverse reducer at the bottom of the central shaft. When the central shaft rotates, it drives the reverse reducer to rotate in the opposite direction, driving the impact bracket, conical screen and impact rotor to rotate in the opposite direction of the standard single rotor.

[0010] The feeding part is mainly a feeding pipe arranged symmetrically on the upper part of the crushing chamber. The upper part of the feeding pipe is connected to the stabilizing bin, and the lower part is tilted inwards and aligned with the impact block on the standard single rotor.

[0011] The finished product extraction part is the extraction pipes arranged on both sides of the top, which are connected to the exhaust fan after being merged at the top.

[0012] During operation, the material is fed symmetrically to the standard single rotor in the multi-rotor impact assembly through the feed port. The impact surface of the impact block on the standard single rotor throws the material to the impact rotor in the same rotation direction and speed, and also throws and impacts each other between the multi-rotors.

[0013] When working, the impact rotor and conical screen rotate in the opposite direction to the standard single rotor, and quickly counterattack the materials thrown out by the standard single rotor.

[0014] The material collides repeatedly between the standard single rotor, between the standard single rotor and the impact rotor, and between the impact and counter-impact paths. The grains experience interface slip and tearing, and the internal cracks spread around and break into fine powder.

[0015] Qualified finished products are extracted and transported to the warehouse by the exhaust fan. The particle size is controlled by the wind speed and pressure of the exhaust fan. Some of the coarse powder that is not extracted and the coarse powder in the inverted cone screen enter the closed-circuit circulation system through the discharge port. Due to the exhaust fan, a negative pressure working state is formed inside the machine when it is working.

[0016] The beneficial effects of the present invention are as follows: the production of the machine can be standardized and serialized, saving production costs and management costs; the hourly output can be changed to meet user requirements by adjusting the number of standard single rotor configurations; and the large-scale production needs of most grinding companies can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a multi-rotor composite impact mill of the present invention;

[0018] Figure 2 yes Figure 1 Internal structure diagram of the middle shell 2;

[0019] Figure 3 It is a schematic diagram of the structure of the multi-rotor impact assembly 5 and the anti-impact assembly 4;

[0020] Figure 4 is a schematic diagram of the connection between the multi-rotor impact assembly 5 and the power drive part;

[0021] Figure 5 It is a schematic diagram of the structure of a standard single rotor 8;

[0022] Figure 6 It is a schematic diagram of the connection between the anti-impact component 4 and the power drive part.

[0023] In the figure: 1-frame, 2-shell, 3-motor, 4-anti-impact assembly, 5-multi-rotor impact assembly, 6-impact rotor, 7-conical screen, 8-standard single rotor, 9-support cover, 10-driving V-belt pulley, 11-driven V-belt pulley, 12-V-belt, 13-driving gear, 14-driven gear, 15-feed pipe, 16-finished product extraction pipe, 17-lower support plate, 18-center shaft, 19-reverse reducer, 20-impact bracket, 21-center support, 22-rotor bearing position, 23-rotor shaft, 24-impact block, 25-rotor bearing, 26-fine material chamber, 27-crushing chamber. DETAILED DESCRIPTION

[0024] The utility model relates to a multi-rotor compound impact mill, which is composed of a frame, a feed, a power drive, a multi-rotor compound impact mill, a finished product extraction, a lubrication, an operation monitoring and the like.

[0025] See also Figure 1 , Figure 2 The frame 1 is welded by steel, and its pillars are connected to the foundation through embedded parts. The support cover 9 is supported and fixed by the frame 1, which is the key to the normal operation of the whole machine. The shell 2 is fixed on the frame 1 and the support cover 9. The shell 2 is a protective cover for safe production and negative pressure production. The upper part is a cylinder made of steel plate, and the lower end is an inverted truncated table made of steel plate.

[0026] See also Figure 3 The multi-rotor grinding components are placed inside the shell 2, including a counter-impact component 4 and a multi-rotor impact component 5 placed inside the counter-impact component 4.

[0027] The counter-impact assembly 4 includes a counter-impact rotor 6, a conical screen 7 and a counter-impact bracket 20. The axis of the counter-impact rotor 6 coincides with the axis of the housing 2, the upper end is open and not connected, and a distance of 6 to 10 mm is left with the support cover plate 9. The lower end is connected to the large round end of the inverted conical screen 7. The small round end of the inverted conical screen 7 is connected to the supporting top end of the counter-impact bracket 20. The central axial hole of the counter-impact bracket 20 is fixed to the output shaft end of the reverse reducer 19 with a key. The counter-impact bracket 20 is a cross bracket with an axial hole in the center formed by wear-resistant alloy. The inverted conical screen 7 is formed by punching and rolling a wear-resistant alloy plate, and the large open end of the conical screen 7 is connected to the cylindrical counter-impact rotor 6 rolled by a wear-resistant alloy plate.

[0028] The multi-rotor impact assembly 5 is arranged inside the counter-rotor 6. The multi-rotor impact assembly 5 is composed of 2 to 8 standard single rotors 8, and the number of the rotors 8 is arranged according to the user's requirements for the equipment's output per unit hour. The rotor shaft 23 is vertically parallel to the central axis 18 and is evenly distributed around the central axis. In this embodiment, the number of the standard single rotors 8 is four.

[0029] See also Figure 5 The standard single rotor 8 includes a rotor shaft 23 and a multi-layer impact block 24 fixedly surrounding it. The impact block 24 can be set to 2 to 3 impact layers, and each layer is evenly provided with 3 to 8 impact surfaces in the circumferential direction. The number of impact layers and impact surfaces must be considered in combination with the requirements of output and discharge particle size.

[0030] See also Figure 1 , 2 and 3, a crushing chamber 27 is formed between the multi-rotor impact assembly 5 and the counter-impact assembly 4, and a feed pipe 15 is symmetrically arranged on the support cover plate 9, the upper end of which is connected to the stabilizing bin, and the lower end is directly connected to the crushing chamber 27, and the discharge port of the feed pipe 15 is obliquely aligned with the standard single rotor 8.

[0031] A fine material chamber 26 is formed between the anti-impact assembly 4 and the housing 2, and the finished material in the crushing chamber 27 enters the fine material chamber 26 through the conical screen 7. A finished product extraction pipe 16 is provided between the top of the fine material chamber 26 and the support cover plate 9. The finished product extraction pipe 16 is connected to the exhaust fan to suck the finished fine material into the finished product warehouse for storage. The particle size of the finished product is controlled by the wind speed and pressure of the exhaust fan. When the exhaust fan is working, the entire grinding process forms a negative pressure production.

[0032] See also Figure 1 , Figure 4 and Figure 6The action of driving the multi-rotor impact assembly 5 in the power drive part is transmitted from the active V-belt pulley 10 on the motor 3 to the driven V-belt pulley 11 through the V-belt 12, driving the central shaft 18. The central shaft 18 has a driving gear 13 fixed with a key, which then meshes with the driven gear 14 evenly distributed around the periphery and fixed on the standard single rotor shaft, driving the standard single rotor 8 and the impact block 24 to rotate at high speed.

[0033] The action of driving the anti-impact component 4 in the power drive part is that a reverse reducer 19 is connected to the bottom end of the central shaft 18. When the central shaft 18 rotates, it drives the reverse reducer 19 to rotate in the opposite direction, driving the impact bracket 20, the conical screen 7 and the impact rotor 6 to rotate in the opposite direction to the standard single rotor 8.

[0034] The inner rotor assembly 5 is arranged in the middle of the equipment, and is positioned and fixed by the upper support cover plate 9 and the lower support plate 17. The lower support plate 17 is cross-shaped, and four rotor bearing positions 22 are arranged at its four corners. The rotor shaft 23 of the standard single rotor 8 is sleeved with rotor bearings 25 at the upper and lower ends, and the rotor bearings 25 are installed on the rotor bearing positions 22. High-strength support rods and locking nuts are provided around the multi-rotor impact assembly to position and lock the support cover plate 9 and the lower support plate 17. In this embodiment, the number of high-strength studs is four sets.

[0035] See also Figure 1 , Figure 2 and Figure 3 When the multi-rotor composite impact mill is working, the motor 3 drives the multi-rotor impact assembly 5 through the belt transmission mechanism and the gear transmission mechanism, so that the central shaft 18 drives the multi-rotor impact assembly 5 to rotate at high speed. At the same time, the central shaft 18 also drives the counter-impact assembly 4 to rotate in the opposite direction. The material enters the crushing chamber 27 through the feed pipe 15 and rushes to the standard single rotor 8. It is immediately thrown outward at high speed by the impact block 24, and then counter-attacked by the counter-impact rotor 6 to impact the standard single rotor 8. The material has repeated collisions between the standard single rotor 8, between the standard single rotor 8 and the counter-impact rotor 6, and between the impact and counter-impact paths. Its grains produce interface slip and tearing, and the internal cracks spread around and break into fine powder. Qualified fine powder enters the fine material chamber 26 through the conical screen, is extracted by the finished product extraction pipe 16, and enters the finished product warehouse; the coarse material is discharged from the bottom through the gap of the counter-impact bracket 20 and enters the closed-circuit circulation system.

[0036] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0037] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-rotor compound impact mill, consisting of a frame, a feeder, a power drive, a multi-rotor compound impact mill, a finished product extraction, a lubrication, and an operation monitoring part, characterized in that: The multi-rotor composite impact grinding part is composed of a multi-rotor impact assembly and a counter-impact assembly. The constituent unit of the multi-rotor impact assembly is a standard single rotor. The multi-rotor impact assembly is composed of 2 to 8 standard single rotors arranged around the central axis. The counter-impact assembly is composed of an impact bracket, a conical screen and an impact rotor. The multi-rotor impact assembly is contained in the impact rotor. The anti-impact assembly consists of an impact bracket, a conical screen and an impact rotor. The impact bracket is keyed to the output shaft at the lower end of the reverse reducer. The bottom end of the reverse reducer is mounted on the central support through a thrust roller bearing. The upper end of the reverse reducer is fixed to the lower support plate of the equipment, and its input shaft end is connected to the central shaft. The impact bracket is a cross bracket with an axial hole in the center formed by wear-resistant alloy. The top end is connected to the small opening end of an inverted conical screen formed by punching and rolling wear-resistant alloy plate. The large opening end of the conical screen is connected to the lower end of a cylindrical impact rotor rolled by wear-resistant alloy plate. The upper end of the impact rotor is not connected or constrained. The standard single rotor that constitutes the multi-rotor impact assembly unit is composed of a rotor shaft and an impact block. The impact block is divided into 2 to 3 layers. According to the requirements of the product discharge particle size, 3 to 8 impact surfaces are arranged on each layer. The number of standard single rotors is 2 to 8 evenly distributed according to the output. The rotor shaft is vertically parallel to the central axis and surrounds the central axis as the center. The upper end of each rotor shaft is fixed with a driven gear by a key; The power drive part includes a motor that drives the multi-rotor impact assembly to rotate, the V-belt pulley of the motor transmits power to the central shaft through a V-belt, and the central shaft is provided with a driving gear fixed by a key, which then meshes with a driven gear evenly distributed around the periphery and fixed on the standard single rotor shaft, driving the standard single rotor and the impact block to rotate at high speed; The power drive part includes a reversing reducer for driving the anti-impact component to rotate. The bottom end of the central shaft is connected to the reversing reducer. When the central shaft rotates, it drives the reversing reducer to rotate in the opposite direction, driving the impact bracket, the conical screen and the impact rotor to rotate in the opposite direction to the standard single rotor.

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