Dual-drive dry grinding equipment

Abstract

The invention discloses dual-drive dry grinding equipment, which belongs to the field of grinding equipment and comprises a grinding cylinder, two ends of the grinding cylinder are respectively and fixedly provided with a grinding cylinder rotating shaft, a grinding rotor is arranged in the grinding cylinder, two ends of the grinding rotor are respectively and fixedly provided with a rotor transmission shaft, and the rotor transmission shafts and the grinding cylinder rotating shafts are concentric and non-coaxial and can relatively independently rotate. According to the grinding equipment, in the grinding process, the grinding cylinder can be rotated to drive a grinding medium to roll, the grinding efficiency is greatly improved, meanwhile, the grinding medium is evenly stressed on the inner wall of the grinding cylinder to shear and collide, generation of static electricity is reduced, and therefore hardening and accumulation of powder on the inner wall are reduced, and the powder is more evenly ground; by rotating the grinding rotor, higher power is provided for the grinding medium in the grinding inner cavity, so that the grinding efficiency is improved again, the rotor transmission shaft and the grinding cylinder rotating shaft are of a concentric and heteroaxial structure, the grinding cylinder and the grinding rotor can rotate and operate at different rotating speeds, the grinding device is suitable for operation under different working conditions, and the error-tolerant rate is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding equipment, in particular to a dual-drive dry grinding equipment. Background Art

[0002] Grinding methods are generally divided into wet grinding and dry grinding. Wet grinding mainly involves mixing powder and solvent according to the formula ratio and then entering the grinder. The particles in the slurry are ground into fine particles under the collision and shearing action of the grinding medium. Dry grinding is mainly based on the target powder, without the participation of liquid solvent. Different solid additives may be added for different working conditions. The powder is ground into fine particles under the collision and shearing action of the grinding medium. In some cases where solid powder is used as the finished product, dry grinding can save many processes such as drying compared to wet grinding, and can also save a lot of cost in terms of energy consumption of the entire line. Therefore, dry grinding has great advantages in some industries. But at the same time, there are two grinding methods in the dry grinding process. One is to drive the rotor to drive the grinding medium for grinding. However, since the materials are mostly powders, their fluidity is poor. In the grinding cavity, they are often accumulated in the lower part of the grinding cavity under the influence of gravity. It is easy for the grinding media to adhere to the inner wall of the grinding cylinder during the falling process. Other positions on the inner wall of the grinding cylinder are also unevenly distributed due to the grinding action. It is very easy to produce static electricity during the grinding process, which will adsorb fine powder and result in a small output of the product. The other is to drive the grinding cylinder to flip and cause the grinding medium to continuously roll in the grinding cavity for grinding. However, since the grinding cylinder is large and the rotation speed is low, the kinetic energy of the grinding medium is insufficient, the grinding efficiency is poor, and the production capacity is small. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of small discharge volume, insufficient kinetic energy of grinding media and poor grinding efficiency caused by gravity accumulation and electrostatic adsorption of powder in the existing dry grinding method, and to propose a dual-drive dry grinding device.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a dual-drive dry grinding device, comprising a horizontally arranged grinding cylinder, a grinding chamber in which a grinding medium can be placed, the grinding cylinder is connected to a first drive assembly and is driven by the first drive assembly, a grinding cylinder flange is fixed at each end of the grinding cylinder, a grinding cylinder shaft is fixed on each side of the two grinding cylinder flanges away from each other, a grinding rotor is arranged in the grinding cylinder, a rotor transmission shaft is fixedly connected at each end of the grinding rotor, the rotor transmission shaft passes through the grinding cylinder shaft, the central axis of the rotor transmission shaft coincides with the central axis of the grinding cylinder shaft, and the rotor transmission shaft and the grinding cylinder shaft can rotate relatively independently, and the rotor transmission shaft is connected to a second drive assembly and is driven by the second drive assembly.

[0005] Furthermore, the first driving assembly comprises a grinding cylinder driving motor, a grinding cylinder driving wheel is connected to the motor shaft of the grinding cylinder driving motor, a grinding cylinder driven wheel is provided in the middle of the grinding cylinder, and a grinding cylinder transmission belt is provided between the grinding cylinder driving wheel and the grinding cylinder driven wheel.

[0006] Furthermore, the second drive assembly includes a rotor drive motor, a rotor driving wheel is connected to the motor shaft of the rotor drive motor, a rotor driven wheel is fixed to the end of the rotor transmission shaft, and a rotor transmission belt is provided between the rotor driving wheel and the rotor driven wheel.

[0007] Furthermore, one end of the grinding cylinder is rotatably connected to the feed cylinder, and the other end is rotatably connected to the discharge cylinder. The feed cylinder has a feed cavity, a feed port is arranged at the top of the feed cylinder, the discharge cylinder has a discharge cavity, and a discharge port is arranged at the bottom of the discharge cylinder. The feed cavity and the discharge cavity are both connected to the grinding cavity.

[0008] Furthermore, a grid filter is provided on the grinding cylinder flange between the grinding cylinder and the discharging cylinder.

[0009] Furthermore, the two grinding cylinder shafts respectively pass through the feed cylinder and the discharge cylinder, and the ends of the two grinding cylinder shafts are rotatably mounted on the two grinding cylinder bearing seats, respectively. A sealing device is provided between the grinding cylinder shaft and the feed cylinder and the discharge cylinder.

[0010] Furthermore, both ends of the two rotor transmission shafts are rotatably mounted on the rotor bearing seats, and the two grinding cylinder bearing seats are located between the two rotor bearing seats.

[0011] Furthermore, the feed barrel is in a truncated cone shape, and an air supply port is provided on the side of the feed barrel.

[0012] Furthermore, the upper part of the discharging barrel is cylindrical and the lower part is frustum-shaped. A spiral discharging device is arranged inside the discharging barrel, and the outlet of the spiral discharging device corresponds to the discharging port position of the discharging barrel. An exhaust port is arranged on the top of the discharging barrel, and the exhaust port is connected to the dust removal equipment.

[0013] Furthermore, a feed barrel bracket is provided at the bottom of the feed barrel, and a discharge barrel bracket is provided at the bottom of the discharge barrel.

[0014] In the dual-drive dry grinding equipment of the present invention, the grinding cylinder is driven to rotate by the grinding cylinder driving motor, and the grinding rotor is driven to rotate by the rotor driving motor; a rotor bearing seat and a grinding cylinder bearing seat are provided, the rotor bearing seat serves as a supporting bearing of the rotor transmission shaft, and the grinding rotor is installed and fixed on the rotor transmission shaft; the grinding cylinder bearing seat serves as a supporting bearing of the grinding cylinder rotating shaft, and the grinding cylinder is installed and fixed on the grinding cylinder rotating shaft through the grinding cylinder flange, and the grinding cylinder rotating shaft and the rotor transmission shaft are concentric shafts, which can rotate independently at different speeds and are suitable for operation under different working conditions.

[0015] The dual-drive dry grinding equipment of the present invention is also provided with a feed cylinder at one end of the grinding cylinder, a feed cavity is arranged in the feed cylinder, the feed cylinder is in a truncated cone shape, the truncated cone large end of the feed cylinder is connected with the grinding cavity, a feed port is arranged on the feed cylinder, and an air supply port is arranged on the side, the powder enters through the feed port, and enters the grinding cavity along the taper of the feed cavity, and the side air supply port can be used to replenish gas, adjust the pressure in the grinding cavity, and blow the powder into the grinding cavity at the same time to prevent excessive accumulation of powder in the feed cavity; a discharge cylinder is arranged at the other end of the grinding cylinder, a discharge cavity is arranged in the discharge cylinder, the upper part of the discharge cylinder is cylindrical, and the bottom is truncated cone-shaped, and a spiral discharge device is arranged in the discharge cavity, and the outlet of the spiral discharge device is located at the same position as the discharge port Corresponding to the arrangement, an exhaust port is provided at the upper end of the discharge barrel, and the exhaust port is connected to an external dust removal device. Under the action of the fan of the dust removal device, a slightly negative pressure state is formed in the discharge chamber, and the ground powder moves to the discharge side under the action of the pressure difference, and the grinding medium continues to stay in the grinding chamber after being intercepted by the grid filter of the grinding barrel flange. The powder enters the discharge chamber through the grid filter and falls on the spiral discharge device at the bottom for discharge, thereby avoiding powder accumulation. After the discharged powder is sieved by an external grading device, the qualified products are taken out by the fan of the external dust removal device and collected as finished products, and the unqualified products return to the grinding equipment of the present invention through the feed port for re-grinding, thereby forming a closed loop.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) During the grinding process, the device of the present invention can promote the powder to be ground more evenly by rotating the grinding cylinder, thereby reducing the accumulation of powder on the inner wall;

[0018] (2) During the grinding process, the equipment of the present invention can rotate the grinding cylinder so that the grinding media can be uniformly sheared and collided on the inner wall of the grinding cylinder, thereby reducing the generation of static electricity;

[0019] (3) During the grinding process, the device of the present invention can provide higher power to the grinding media in the grinding chamber by rotating the grinding rotor, thereby improving the grinding efficiency;

[0020] (4) The equipment of the present invention is provided with an air supply port, which can adjust the pressure in the grinding chamber to maintain a slight negative pressure state in the grinding chamber;

[0021] (5) The equipment of the present invention is provided with a concentric and eccentric structure, and the grinding cylinder and the grinding rotor can rotate and operate at different speeds, which is suitable for operation under different working conditions and has a higher fault tolerance rate;

[0022] (6) The equipment of the present invention can be connected to an external grading device during the grinding process, and can be connected in series with the grading device to achieve batch cycle grinding until the material is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a front view of the dual-drive dry grinding equipment of the present invention.

[0024] Figure 2 It is a top view of the dual-drive dry grinding equipment of the present invention.

[0025] Figure 3 It is a flow chart of batch cycle of the dual-drive dry grinding equipment of the present invention.

[0026] Legend:

[0027] 1-base; 2-rotor bearing seat; 3-grinding cylinder bearing seat; 4-discharge cylinder; 5-exhaust port; 6-grinding cylinder flange; 7-grinding rotor; 8-grinding cylinder; 9-feeding port; 10-feeding cylinder; 11-rotor driven wheel; 12-air supply port; 13-grinding cylinder shaft; 14-feeding cylinder bracket; 15-rotor transmission shaft; 16-grinding cylinder driven wheel; 17-discharge port; 18-discharge cylinder bracket; 19-air sealing device; 20-grinding cylinder driving motor; 21-grinding cylinder driving wheel; 22-grinding cylinder transmission belt; 23-rotor driving motor; 24-rotor driving wheel; 25-rotor transmission belt; 26-spiral discharging device. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] This embodiment provides a dual-drive dry grinding device, such as Figure 1 — Figure 2As shown, it includes a base 1, on which a feed cylinder 10 is fixed through a feed cylinder bracket 14, and a discharge cylinder 4 is fixed through a discharge cylinder bracket 18. A horizontally arranged grinding cylinder 8 is rotatably connected between the feed cylinder 10 and the discharge cylinder through a grinding cylinder flange 6, wherein a grid filter is provided on the grinding cylinder flange 6 between the discharge cylinder 4 and the grinding cylinder 8, and a grinding chamber is provided in the grinding cylinder 8. During the grinding operation, the grinding chamber can be filled with grinding media to improve the grinding efficiency and prevent the material from being hardened and accumulated on the inner wall of the grinding chamber. A hollow grinding cylinder rotating shaft 13 is fixed on each of the grinding cylinder flanges 6 at both ends of the grinding cylinder 8. One end of the two grinding cylinder shafts 13 respectively passes through the feed cylinder 10 and the discharge cylinder 4, and is rotatably mounted on the two grinding cylinder bearing seats 3. An air sealing device 19 is provided between one of the grinding cylinder shafts 13 and the discharge cylinder 4 for sealing. The grinding cylinder bearing seat 3 is fixed on the base 1. A grinding cylinder driven wheel 16 is fixed in the middle of the grinding cylinder 8. The grinding cylinder driven wheel 16 is connected to the grinding cylinder driving wheel 21 through a grinding cylinder transmission belt 22. The grinding cylinder driving wheel 21 is connected to the motor shaft of the grinding cylinder driving motor 20 fixed on the base 1. Under the drive of the grinding cylinder driving wheel 21, the grinding cylinder 8 is driven to rotate; the feed cylinder 10 and the discharge cylinder 4 do not rotate with the rotation of the grinding cylinder 8. The feed cylinder 10 is in a truncated cone shape and has a feed cavity. A feed port 9 is provided on the upper part of the feed cylinder 10. The material to be ground enters the grinding cavity from the feed port 9 and enters the grinding cavity along the inner wall of the truncated cone for grinding. An air supply port 12 is provided on the side of the feed cylinder 10 for replenishing gas, adjusting the pressure of the grinding cavity, and blowing the material in the feed cavity into the grinding cavity to prevent the material from accumulating in the feed cavity; the upper part of the discharge cylinder 4 is cylindrical, the lower part is frustum-shaped, and has There is a lowest discharge end, a discharge port 17 is arranged at the bottom of the discharge barrel 4, and an exhaust port 5 is arranged at the upper part. The exhaust port 5 can be connected to the dust removal equipment. Under the action of the fan of the dust removal equipment, a slightly negative pressure state is formed in the discharge chamber, so that the ground powder passes through the grid filter under the action of the pressure difference and moves to the discharge side and is discharged through the discharge port 17, while the grinding medium remains in the grinding chamber. A spiral discharge device 26 is arranged in the discharge barrel 4, and the outlet of the spiral discharge device 26 corresponds to the position of the discharge port 17. The powder passes through the grid filter and enters the discharge chamber. The powder with a larger specific gravity falls on the spiral discharge device 26 at the bottom for discharge;

[0030] A grinding rotor 7 is arranged in the grinding cylinder 8, and a rotor transmission shaft 15 is fixedly connected to each of the two ends of the grinding rotor 7. The rotor transmission shaft 15 passes through the grinding cylinder shaft 13, and the central axis of the rotor transmission shaft 15 coincides with the central axis of the grinding cylinder shaft 13, and the rotor transmission shaft 15 and the grinding cylinder shaft 13 can rotate relatively independently, and the rotor transmission shaft 15 is rotatably mounted on two rotor bearing seats 2 respectively, and the rotor bearing seats 2 are fixed on the base 1 and are located outside the two grinding cylinder bearing seats 3; one of the rotor transmission shafts 15 is connected to the second driving assembly and driven by the second driving assembly, and the second driving assembly includes a rotor driving motor 23, and a rotor driving wheel 24 is connected to the motor shaft of the rotor driving motor 23, and a rotor driven wheel 11 is fixed to the end of the rotor transmission shaft 15, and a rotor driving belt 25 is arranged between the rotor driving wheel 24 and the rotor driven wheel 11, and under the drive of the rotor driving motor 23, the rotor driving wheel 24 drives the grinding rotor 7 to rotate, and grinds the material together with the grinding medium.

[0031] from Figure 1 It can be seen that the rotor bearing seat 2 serves as a support bearing for the rotor transmission shaft 15 and is fixed on the base 1, and the grinding rotor 7 is installed and fixed on the rotor transmission shaft 15; the grinding cylinder bearing seat 3 serves as a support bearing for the grinding cylinder rotating shaft 13 and is fixed on the base 1, and the grinding cylinder 8 is installed and fixed on the grinding cylinder rotating shaft 13 through the grinding cylinder flange 6, and the grinding cylinder rotating shaft 13 and the rotor transmission shaft 15 are concentric and eccentric, and can rotate independently of each other;

[0032] from Figure 2 It can be seen that the grinding cylinder 8 is driven to rotate by the grinding cylinder driving motor 20 via the grinding cylinder transmission belt 21 (or the reduction motor with the grinding cylinder transmission belt), and the grinding rotor 7 is driven to rotate by the rotor driving motor 23 via the rotor transmission belt 25 (or the reduction motor with the rotor transmission belt). Based on the above two being concentric and eccentric structures, the grinding cylinder 8 and the grinding rotor 7 can rotate independently at different speeds, which is suitable for different working conditions.

[0033] from Figure 1It can be seen that a feed cylinder 10 and a discharge cylinder 4 are respectively provided on both sides of the grinding cylinder 8. The feed cylinder 10 is in a truncated cone shape, and the large end of the truncated cone opening is connected to the grinding chamber. A feed port 9 is provided on the feed cylinder 10, and an air supply port 12 is provided on the side. The material to be ground enters the feed chamber through the feed port 9 and enters the grinding chamber along the taper of the feed chamber. The side air supply port 12 can be used to supplement gas, adjust the pressure of the feed chamber and the grinding chamber, and prevent excessive material accumulation in the feed chamber; the upper part of the discharge cylinder 4 is cylindrical, and the bottom is a cone-like body to form the lowest position of the discharge chamber, and a spiral is provided at the lowest position. A discharge device 26 is provided, and the outlet of the spiral discharge device 26 is arranged above the discharge port 17 and close to the discharge port 17. In addition, an exhaust port 5 is arranged at the upper end of the discharge cylinder 4, and the exhaust port 5 is connected to the external dust removal equipment. Under the action of the fan of the dust removal equipment, a slight negative pressure state is formed in the discharge chamber, and the ground powder moves to the discharge side under the action of the pressure difference. The grinding medium is intercepted by the grid filter on the grinding cylinder flange 6 and remains in the grinding chamber. The powder passes through the grid filter and enters the discharge chamber. The powder with a larger specific gravity falls on the spiral discharge device 26 at the bottom for discharge;

[0034] The discharge port 17 of the dual-drive dry grinding device of the present invention can be connected to an external grading device. The powder discharged from the discharge port 17 is screened by the grading device, and the qualified products are taken out by the fan of the external dust removal device and collected as finished products. The unqualified products are returned to the dual-drive dry grinding device of the present invention through the feed port 9 for re-grinding; at the same time, since it is necessary to exhaust air through the exhaust port 5 to form a certain negative pressure in the discharge chamber, the powder synchronously extracted from the exhaust port 5 is also the required material, so it can be sent to the grading device through the conveying pipeline for screening, such as Figure 3 shown.

[0035] In summary, the dual-drive dry grinding device of the present invention can drive the grinding cylinder 8 and the grinding rotor 7 to operate independently through two drive components, and can realize batch cycle dry grinding equipment.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents, such as replacing the first drive assembly and / or the second drive assembly with gear drive, chain drive, etc. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. A dual-drive dry grinding device, comprising a horizontally arranged grinding cylinder (8), wherein the grinding cylinder (8) has a grinding chamber, the grinding cylinder (8) is connected to a first drive assembly and driven by the first drive assembly, a grinding cylinder flange (6) is fixed to each end of the grinding cylinder (8), and a grinding cylinder rotating shaft (13) is fixed to each side of the two grinding cylinder flanges (6) away from each other, wherein: A grinding rotor (7) is arranged inside the grinding cylinder (8), and a rotor transmission shaft (15) is fixedly connected to each of the two ends of the grinding rotor (7). The rotor transmission shaft (15) passes through the grinding cylinder rotating shaft (13), and the central axis of the rotor transmission shaft (15) coincides with the central axis of the grinding cylinder rotating shaft (13), and the rotor transmission shaft (15) and the grinding cylinder rotating shaft (13) can rotate relatively independently, and the rotor transmission shaft (15) is connected to a second driving assembly and is driven by the second driving assembly.

2. The dual-drive dry grinding device according to claim 1, characterized in that: The first driving assembly comprises a grinding cylinder driving motor (20), a motor shaft of the grinding cylinder driving motor (20) is connected to a grinding cylinder driving wheel (22), a grinding cylinder driven wheel (16) is arranged in the middle of the grinding cylinder (8), and a grinding cylinder transmission belt (21) is arranged between the grinding cylinder driving wheel (22) and the grinding cylinder driven wheel (16).

3. The dual-drive dry grinding device according to claim 1, characterized in that: The second drive assembly comprises a rotor drive motor (23), a motor shaft of the rotor drive motor (23) is connected to a rotor driving wheel (24), an end of the rotor transmission shaft (15) is fixed with a rotor driven wheel (11), and a rotor transmission belt (25) is provided between the rotor driving wheel (24) and the rotor driven wheel (11).

4. The dual-drive dry grinding device according to claim 1, characterized in that: One end of the grinding cylinder (8) is rotatably connected to the feed cylinder (10), and the other end is rotatably connected to the discharge cylinder (4). The feed cylinder (10) has a feed cavity, and a feed port (9) is provided at the top of the feed cylinder (10). The discharge cylinder (4) has a discharge cavity, and a discharge port (17) is provided at the bottom of the discharge cylinder (4). The feed cavity and the discharge cavity are both connected to the grinding cavity.

5. The dual-drive dry grinding device according to claim 4, characterized in that: A grid filter is provided on the grinding cylinder flange (6) between the grinding cylinder (8) and the discharge cylinder (4).

6. The dual-drive dry grinding device according to claim 4, characterized in that: The two grinding cylinder shafts (13) are respectively passed through the feed cylinder (10) and the discharge cylinder (4), and the ends of the two grinding cylinder shafts (13) are respectively rotatably mounted on the two grinding cylinder bearing seats (3). A sealing device (19) is provided between the grinding cylinder shaft (13) and the feed cylinder (10) and the discharge cylinder (4).

7. The dual-drive dry grinding device according to claim 6, characterized in that: The two rotor transmission shafts (15) are rotatably mounted on the rotor bearing seats (2), and the two grinding cylinder bearing seats (3) are located between the two rotor bearing frames (2).

8. The dual-drive dry grinding device according to claim 4, characterized in that: The feed tube (10) is in the shape of a truncated cone, and an air supply port (12) is provided at the lower part of the feed tube (10).

9. The dual-drive dry grinding device according to claim 4, characterized in that: The discharge barrel (4) is cylindrical in the upper part and frustum-shaped in the lower part. A spiral discharge device (26) is arranged inside the discharge barrel (4). The outlet of the spiral discharge device (26) corresponds to the position of the discharge port (17) of the discharge barrel (4). An exhaust port (5) is arranged at the top of the discharge barrel (4), and the exhaust port (5) is connected to the dust removal equipment.

10. The dual-drive dry grinding device according to claim 4, characterized in that: A feed barrel support (14) is provided at the bottom of the feed barrel (10), and a discharge barrel support (18) is provided at the bottom of the discharge barrel (4).

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