A pre-crushing device for high-efficiency grinding of low-diameter materials

Abstract

This utility model discloses a pre-crushing device for high-efficiency grinding of low-diameter materials, including a crushing box, a rotor shaft, a rotor, crushing hammers, a drive mechanism, an impact plate, a screen plate, a grinding plate, and a grinding roller. The crushing box has a feed inlet at the front and a discharge outlet at the bottom. The rotor shaft is horizontally positioned inside the crushing box and rotatably connected to the two side walls of the crushing box. The rotor is coaxially fixed on the rotor shaft. Multiple crushing hammers are arranged circumferentially on the rotor. The drive mechanism is located outside the crushing box to drive the rotor shaft to rotate. The impact plate is fixedly positioned at the top inside the crushing box. The screen plate is inclinedly positioned behind the rotor and fixedly connected to the two side walls of the crushing box. The grinding plate is positioned below the impact plate. The grinding roller is positioned below the screen plate and abuts against the grinding plate. The central shaft of the grinding roller is rotatably connected to the two side walls of the crushing box. The central shaft of the grinding roller is connected to the rotor shaft via a transmission mechanism. This utility model has high crushing efficiency and good particle size uniformity.

Description

Technical Field

[0001] This utility model relates to the field of cement production equipment technology, and in particular to a pre-crushing device for high-efficiency grinding of low-diameter materials. Background Technology

[0002] The raw materials used in cement plant raw meal preparation include limestone, silica, ferroalloy slag, sulfuric acid slag, and fly ash. Limestone, as the main raw material, requires processing such as crushing and grinding. Currently, hammer crushers are commonly used in the industry for primary crushing of limestone. However, existing crushing equipment has revealed a series of significant defects in actual operation. The crushing mechanism of existing equipment is simple, such as impact crushing, making it difficult to achieve precise particle size control. The output contains a large number of oversized coarse particles (>50mm) and over-crushed fine powder (<3mm). Industry measurement data shows that the particle size difference of the material after crushing in a typical production line can reach more than 15:1, and the D60 / D10 uniformity index is less than 0.3, far below the standard value of 0.6 required for vertical mill feed. Vertical mill systems are extremely sensitive to the particle size distribution of the feed. Uneven particle size leads to the deterioration of the stability of the material layer inside the mill: coarse particles prolong the grinding time and increase the wear of the grinding disc; fine powder aggravates airflow short-circuiting and reduces grinding efficiency. Practice shows that when the proportion of material larger than 30mm after crushing exceeds 10%, the vibration value of the vertical mill increases by 40%-60%, the power consumption per ton of product increases by 8-12%, and the qualified rate of the specific surface area of ​​the finished product decreases by about 15 percentage points. Although uniformity can be improved by adding a screening circuit (such as pre-screening + return crushing), the system complexity increases sharply, the equipment footprint increases by more than 30%, and maintenance costs increase by 25%. While simply reducing the discharge port size can control the maximum particle size, it leads to a further deterioration in the over-grinding rate, resulting in a 20%-30% decrease in production capacity. Utility Model Content

[0003] This invention provides a pre-crushing device for high-efficiency grinding of low-diameter materials, which solves the problem that the randomness of materials crushed by traditional hammer crushers makes it difficult to control the size of the output particles, resulting in uneven feed particles in vertical mills and increased energy consumption.

[0004] This utility model provides a pre-crushing device for high-efficiency grinding of low-diameter materials, comprising:

[0005] A crushing box, wherein a feeding port is provided at the front end and a discharge port is provided at the bottom;

[0006] A rotor shaft is laterally disposed inside the crushing chamber and rotatably connected to the two side walls of the crushing chamber.

[0007] The rotor is coaxially fixedly mounted on the rotor shaft;

[0008] A hydraulic breaker, with multiple hydraulic breakers arranged circumferentially on the rotor;

[0009] A drive mechanism is provided outside the crushing chamber for driving the rotor shaft to rotate.

[0010] An impact plate, which is fixedly installed at the top of the crushing chamber;

[0011] A screen plate, which is inclinedly disposed on the rear side of the rotor and fixedly connected to the two side walls of the crushing box;

[0012] A grinding plate is disposed below the impact plate and is fixedly connected to the two side walls of the crushing box.

[0013] The grinding roller is disposed below the screen plate and abuts against the grinding plate. The central axis of the grinding roller is rotatably connected to the two side walls of the crushing box. The central axis of the grinding roller is connected to the rotor shaft through a transmission mechanism.

[0014] In the above technical solution, preferably, the feeding port is provided with a first protective chain connected to the top of the crushing box, and a second protective chain is provided above the screen plate and fixedly connected to the impact plate.

[0015] In the above technical solution, the crushing box further includes an upper shell and a lower shell. The rear end of the upper shell is hinged to the lower shell. Two hydraulic cylinders are provided on both sides of the lower shell to drive the upper shell to rotate along the hinge.

[0016] In the above technical solution, the transmission mechanism further includes a first pulley, a second pulley, and a first transmission belt. The first pulley is coaxially fixed on the central shaft of the grinding roller, and the second pulley is coaxially fixed on the rotor shaft. The first pulley and the second pulley are connected and driven by the first transmission belt.

[0017] In the above technical solution, the driving mechanism further includes a third pulley, a fourth pulley, a second transmission belt, a drive motor, and a motor base. The third pulley is coaxially mounted on the rotor shaft, and the fourth pulley is coaxially mounted on the output shaft of the drive motor. The third pulley and the fourth pulley are connected and driven by the second transmission belt. The drive motor is mounted on the motor base, and the motor base is mounted on the ground.

[0018] In the above technical solution, further, the bottom surface of the counterattack plate is provided with crushing teeth.

[0019] In the above technical solution, further, multiple transversely distributed strip plates are arranged on the side wall of the grinding roller along the circumferential direction, and grinding teeth are arranged on the inner side wall of the grinding plate.

[0020] As can be seen from the above technical solutions, this utility model provides a pre-crushing device for efficient grinding of low-diameter materials.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention uses a drive mechanism to drive the rotor shaft to rotate. The rotor shaft drives the rotor and the crusher to rotate, applying centrifugal hammer force upward to the large pieces of limestone fed into the feed port, thus crushing the limestone. The crushed material moves upward and impacts the impact plate, rebounding onto the screen plate. After being screened, the qualified material passes through the screen plate and is discharged from the outlet. Larger materials are conveyed as oversize material through the screen plate at an incline to the grinding plate and grinding roller. They are then crushed to the qualified particle size by the grinding roller and grinding plate and discharged from the outlet. By quickly separating and discharging the qualified material and separating the unqualified material for secondary crushing, the invention achieves high crushing efficiency, good uniformity of the crushed material, control of the pre-crushed limestone particle size, reduction of energy consumption in the subsequent grinding system, improvement of grinding efficiency, and increase in the output of the grinding system. Attached Figure Description

[0023] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a pre-crushing device for high-efficiency grinding of low-diameter materials proposed in this utility model.

[0025] Figure 2 This is a three-dimensional structural diagram of a pre-crushing device for high-efficiency grinding of low-diameter materials proposed in this utility model.

[0026] Figure 3 This is a cross-sectional schematic diagram of the internal structure of a pre-crushing device for high-efficiency grinding of low-diameter materials proposed in this utility model.

[0027] Figure 4 This invention presents a schematic diagram of the rotor shaft, rotor, and breaker hammer installation structure of a pre-crushing device for high-efficiency grinding of low-diameter materials.

[0028] In the picture:

[0029] 1- Crushing box; 10- Inspection door; 11- Feed inlet; 12- Discharge outlet; 13- Upper shell; 14- Lower shell; 15- First protective chain; 16- Second protective chain; 17- Hinge; 18- Hydraulic cylinder;

[0030] 2-Rotor shaft; 21-First pulley; 22-Second pulley; 23-First transmission belt;

[0031] 3-Rotor;

[0032] 4- Hydraulic breaker;

[0033] 5-Drive mechanism; 51-Third pulley; 52-Fourth pulley; 53-Second transmission belt; 54-Drive motor; 55-Motor mount;

[0034] 6-Counterattack plate; 61-Crushing tooth;

[0035] 7-Sieve plate;

[0036] 8-Grinding plate; 81-Grinding teeth;

[0037] 9-Grinding roller; 90-Central shaft; 91-Strip plate. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0039] Example 1:

[0040] See Figure 1-4 A pre-crushing device for high-efficiency grinding of low-diameter materials, comprising:

[0041] Crushing box 1, with a feeding port 11 at the front and a discharge port 12 at the bottom; a maintenance door 10 is provided at the rear of crushing box 1.

[0042] Rotor shaft 2 is horizontally arranged inside crushing box 1 and rotatably connected to bearings in bearing seats corresponding to the two side walls of crushing box 1.

[0043] Rotor 3 is coaxially fixed on rotor shaft 2;

[0044] Multiple hydraulic breakers 4 are arranged on the rotor 3 along the circumferential direction. Each hydraulic breaker 4 is arranged in a linear array along the axial direction and in an array along the circumferential direction. Each hydraulic breaker 4 is hinged to the hinge seat on the rotor 3 through a hinge seat. During the rotation of the rotor 3, the hydraulic breaker 4 can swing to strike the pre-crushed material on the outside of the rotor 3.

[0045] Drive mechanism 5, which is located outside the crushing box 1 and is used to drive the rotor shaft 2 to rotate;

[0046] The impact plate 6 is inclinedly installed at the top of the crushing box 1. The two sides of the impact plate 6 are fixedly connected to the two inner walls of the crushing box 1. The impact plate 6 is an arc-shaped plate with the arc-shaped surface facing downwards.

[0047] The screen plate 7 is a flat screen. The screen plate 7 is inclined at the front and lower at the back and is fixedly connected to the two side walls of the crushing box 1. This makes it easy for limestone particles falling on the screen plate 7 to be automatically screened along the inclined surface of the screen plate 7.

[0048] Grinding plate 8 is inclinedly set below impact plate 6, and both sides of grinding plate 8 are fixedly connected to the two side walls of crushing box 1.

[0049] Grinding roller 9 is located below screen plate 7 and abuts against grinding plate 8. The central shaft 90 of grinding roller 9 is rotatably connected to the bearings in the bearing seats corresponding to the two side walls of crushing box 1. The central shaft 90 of grinding roller 9 is connected to rotor shaft 2 through a transmission mechanism.

[0050] In the above embodiment, the rotor shaft 2 is driven to rotate by the drive mechanism 5. The rotor shaft 2 drives the rotor 3 and the crusher 4 to rotate and apply centrifugal hammer force upward to the large pieces of limestone added at the feed port 11, crushing the limestone blocks. The crushed material moves from bottom to top and hits the impact plate 6. It bounces back onto the screen plate 7 after being screened by the impact plate 6. The qualified material passes through the screen plate 7 and is discharged from the discharge port 12. The larger material is conveyed at an incline between the grinding plate 8 and the grinding roller 9 as the oversize material. It is crushed to the qualified particle size by the grinding roller 9 and the grinding plate 8 and then discharged from the discharge port 12. By quickly separating and discharging the qualified material and separating the unqualified material for secondary crushing, the crushing efficiency is high, the uniformity of the crushed material is good, and the power consumption of the subsequent vertical mill grinding is reduced.

[0051] In the above embodiments, preferably, see [reference needed]. Figure 3 The feeding port 11 is equipped with a first protective chain 15 connected to the top of the crushing box 1, and a second protective chain 16 is fixedly connected to the impact plate 6 above the screen plate 7. The first protective chain 15 and the second protective chain 16 can intercept the crushed large pieces of material, preventing them from falling onto the screen plate 7 after crushing, thereby increasing the utilization rate of the screen plate 7.

[0052] In the above embodiments, specifically, see [link to specific examples]. Figure 1 , 23. The crushing box 1 includes an upper shell 13 and a lower shell 14. The rear end of the upper shell 13 is hinged to the lower shell 14 via a hinge 17. Two hydraulic cylinders 18 are provided on both sides of the lower shell 14 to drive the upper shell 13 to rotate along the hinge 17. The lower end of each hydraulic cylinder 18 is hinged to a first hinge seat provided on the lower shell 14, and the upper end is hinged to a second hinge seat provided on the side wall of the upper shell 13. The two hydraulic cylinders 18 can drive the upper shell 13 to rotate along the hinge 17 on the lower shell 14, so that the breaker hammer 4, screen plate 7, grinding plate 8, and grinding roller 9 are exposed for easy maintenance and repair.

[0053] In the above embodiments, specifically, see [link to specific examples]. Figure 2 The transmission mechanism includes a first pulley 21, a second pulley 22, and a first transmission belt 23. The first pulley 21 is coaxially fixed on the central shaft 91 of the grinding roller 9, and the second pulley 22 is coaxially fixed on the rotor shaft 2. The first pulley 21 and the second pulley 22 are connected and driven by the first transmission belt 23. During the rotation of the rotor shaft 2, the second pulley 22 can be driven to rotate. The rotation of the second pulley 22 can drive the first pulley 21 to rotate through the first transmission belt 23. The rotation of the first pulley 21 can drive the central shaft 91 of the grinding roller 9 and the grinding roller 9 to rotate. The material between the grinding roller 9 and the grinding plate 8 is crushed by the grinding roller 9.

[0054] In the above embodiments, specifically, see [link to specific examples]. Figure 1 The drive mechanism 5 includes a third pulley 51, a fourth pulley 52, a second transmission belt 53, a drive motor 54, and a motor base 55. The third pulley 51 is coaxially mounted on the extended end of the rotor shaft 2 that extends out of the side wall of the crushing box 1. The fourth pulley 52 is coaxially mounted on the output shaft of the drive motor 54. The third pulley 51 and the fourth pulley 52 are connected and driven by the second transmission belt 53. The drive motor 54 is fixedly mounted on the motor base 55, which is fixedly mounted on the ground. The output shaft of the drive motor 54 drives the fourth pulley 52 to rotate. The fourth pulley 52 drives the third pulley 51 to rotate through the second transmission belt 53. The rotation of the third pulley 51 drives the rotor shaft 2 to rotate. The rotor shaft 2 drives the breaker hammer 4 on the rotor 3 to strike the lime block for crushing.

[0055] In the above embodiments, specifically, see [link to specific examples]. Figure 3 Multiple horizontally distributed crushing teeth 61 are fixedly installed on the bottom surface of the impact plate 6, with the crushing teeth 61 facing downwards. The crushing teeth 61 can perform secondary crushing on the material impacting the impact plate 6.

[0056] In the above embodiments, specifically, see [link to specific examples]. Figure 3Multiple transversely distributed strip plates 91 are arranged on the side wall of the grinding roller 9 along the circumferential direction. Grinding teeth 81 are arranged on the inner side wall of the grinding plate 8. By moving the strip plates 91 relative to the grinding teeth 81, the material is ground by the grinding teeth 81. Since the distance between the grinding teeth 81 and the grinding roller 9 is fixed, the material particles can be crushed to a qualified size before they can pass through the gap between the grinding teeth 81 and the grinding roller 9.

[0057] Optionally, a pneumatic vibrator can be installed at the bottom of the sieve plate 7 to apply vibration force to the sieve plate 7, thereby increasing the screening efficiency of the sieve plate.

[0058] The working principle of this utility model:

[0059] The controller controls the drive mechanism 5 to drive the rotor shaft 2 to rotate. The rotor shaft 2 drives the rotor 3 and the crusher 4 to rotate, applying centrifugal hammer force upward to the large pieces of limestone added at the feed port 11, crushing the limestone blocks. The crushed material moves from bottom to top and hits the impact plate 6. It bounces back onto the screen plate 7 after being screened by the impact plate 6. The qualified material passes through the screen plate 7 and is discharged from the discharge port 12. The larger material is conveyed at an incline between the grinding plate 8 and the grinding roller 9 as the oversize material. It is crushed to the qualified particle size by the grinding roller 9 and the grinding plate 8 and is discharged from the discharge port 12. By quickly separating and discharging the qualified material and separating the unqualified material for secondary crushing, the crushing efficiency is high, the uniformity of the crushed material is good, and the pressure of subsequent vertical mill grinding is reduced.

[0060] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0061] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A pre-crushing device for high-efficiency grinding of low-diameter materials, characterized in that, The system includes a crushing box (1), a rotor shaft (2), a rotor (3), breaker hammers (4), a drive mechanism (5), a counter-attack plate (6), a screen plate (7), a grinding plate (8), and a grinding roller (9). The crushing box (1) has a feed port (11) at the front end and a discharge port (12) at the bottom. The rotor shaft (2) is horizontally arranged inside the crushing box (1) and rotatably connected to the two side walls of the crushing box (1). The rotor (3) is coaxially fixed on the rotor shaft (2). Multiple breaker hammers (4) are arranged circumferentially on the rotor (3). The drive mechanism (5) is located outside the crushing box (1) and is used to drive the rotor. The shaft (2) rotates, the impact plate (6) is fixedly installed at the top of the crushing box (1), the screen plate (7) is inclinedly installed on the rear side of the rotor (3) and fixedly connected to the two side walls of the crushing box (1), the grinding plate (8) is installed below the impact plate (6) and fixedly connected to the two side walls of the crushing box (1), the grinding roller (9) is installed below the screen plate (7) and abuts against the grinding plate (8), the central shaft (90) of the grinding roller (9) is rotatably connected to the two side walls of the crushing box (1), and the central shaft (90) of the grinding roller (9) is connected to the rotor shaft (2) through a transmission mechanism.

2. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 1, characterized in that, The feed inlet (11) is provided with a first protective chain (15) connected to the top of the crushing box (1), and a second protective chain (16) is provided above the screen plate (7) and fixedly connected to the impact plate (6).

3. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 2, characterized in that, The crushing box (1) includes an upper shell (13) and a lower shell (14). The rear end of the upper shell (13) is hinged to the lower shell (14) via a hinge (17). Two hydraulic cylinders (18) are provided on both sides of the lower shell (14) to drive the upper shell (13) to rotate along the hinge (17).

4. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 1, characterized in that, The transmission mechanism includes a first pulley (21), a second pulley (22), and a first transmission belt (23). The first pulley (21) is coaxially fixed on the central shaft (90) of the grinding roller (9), and the second pulley (22) is coaxially fixed on the rotor shaft (2). The first pulley (21) and the second pulley (22) are connected and driven by the first transmission belt (23).

5. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 1, characterized in that, The drive mechanism (5) includes a third pulley (51), a fourth pulley (52), a second transmission belt (53), a drive motor (54), and a motor base (55). The third pulley (51) is coaxially mounted on the rotor shaft (2), and the fourth pulley (52) is coaxially mounted on the output shaft of the drive motor (54). The third pulley (51) and the fourth pulley (52) are connected and driven by the second transmission belt (53). The drive motor (54) is mounted on the motor base (55), and the motor base (55) is mounted on the ground.

6. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 2, characterized in that, The bottom surface of the counter-attack plate (6) is provided with breaking teeth (61).

7. The pre-crushing device for high-efficiency grinding of low-diameter materials according to claim 1, characterized in that, The grinding roller (9) has multiple transversely distributed strip plates (91) arranged on its side wall along the circumferential direction, and the grinding plate (8) has grinding teeth (81) arranged on its inner side wall.

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