Grinding device driven by permanent magnet synchronous motor

Abstract

The invention discloses a grinding device driven by a permanent magnet synchronous motor, which comprises a grinding machine barrel and a grinding middle shaft, the grinding machine barrel is fixedly connected with the ground, one end of the grinding middle shaft is fixedly connected with a permanent magnet synchronous driving assembly, and the other end of the grinding middle shaft is connected to a first bearing device; a plurality of grinding blades are arranged on the section, in the mill barrel, of the grinding center shaft, and a grinding body is arranged in the mill barrel. And the mill cylinder is provided with a feeding device and a discharging device. Wherein the mill cylinder does not need to bear weight by a grinding center shaft, but is fixed on the ground. The residual weight depends on the permanent magnet synchronous driving assembly and the first bearing device, and the weight of the part is much less than the weight borne by a traditional main hollow shaft, so that a bearing bush, a thin oil station and related assemblies can be removed, the structural complexity is reduced, the requirements for the permanent magnet synchronous driving assembly and the first bearing device are also reduced, and the cost is reduced. Therefore, the maintenance cost is reduced, and the failure rate is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of grinding devices, and particularly relates to a grinding device driven by a permanent magnet synchronous motor. Background Art

[0002] In most traditional grinding equipment such as ball mills and ore mills, the main hollow shaft bears the core load of the equipment operation, and it needs to support the entire weight of the cylinder body, materials and grinding media. To ensure the stable operation of this heavy-load system, the key structural design is to adopt a lubrication support scheme composed of a journal bearing and an oil thinning station. Specifically, the journal bearings located at both ends of the main shaft bear almost all the loads, so extremely high requirements are imposed on their lubrication performance. The core functions of the matching oil thinning station system include: forming a load-bearing oil film to isolate metal friction, achieving effective heat dissipation to control the temperature, and filtering impurities for cleaning protection, jointly ensuring the smooth operation of the main hollow shaft.

[0003] However, this operation mechanism not only includes many components, but also has relatively high requirements for the journal bearing and the oil thinning station. This also means that its overall complexity and failure probability are relatively high. Correspondingly, the subsequent maintenance costs including spare parts, energy consumption and the invested maintenance manpower are also more considerable. Summary of the Invention

[0004] The purpose of the present invention is to provide a grinding device driven by a permanent magnet synchronous motor to solve the problems of high maintenance costs and high failure rates caused by the complex structure and high component requirements of the current grinding device due to the need for a journal bearing and an oil thinning station.

[0005] To solve the above technical problems, the present invention provides a grinding device driven by a permanent magnet synchronous motor, including a mill cylinder and a grinding central shaft. The mill cylinder is fixedly connected to the ground, one end of the grinding central shaft is fixedly connected to a permanent magnet synchronous drive assembly, the grinding central shaft passes through the mill cylinder, and the other end of the grinding central shaft is connected to a first bearing device; a plurality of grinding blades are arranged on a section of the grinding central shaft in the mill cylinder, grinding media are arranged inside the mill cylinder, and the grinding blades and the grinding media are used for grinding materials.

[0006] A feeding device is arranged on one side of the mill cylinder close to the first bearing device; a discharging device is arranged on the top of the mill cylinder.

[0007] Further, a plurality of cylinder fixing devices are arranged at the bottom of the mill cylinder, and the cylinder fixing devices are used to fix the mill cylinder on the ground.

[0008] Further, the permanent magnet synchronous drive assembly includes a drive motor, the drive motor includes a motor housing and a motor rotor part, the motor rotor part is fixedly connected to a coupler, and the coupler is used to transmit the electromagnetic torque of the motor rotor part to the grinding central shaft.

[0009] Further, one end of the grinding central shaft close to the coupler is connected with a second bearing device, which includes a second bearing part and a second bearing seat. The grinding central shaft is fixedly connected to the inner side of the second bearing part, the outer side of the second bearing part is fixedly connected to the second bearing seat, and the bottom of the second bearing seat is fixedly connected to the ground.

[0010] Further, the first bearing device includes a first bearing part and a first bearing seat. The grinding central shaft is fixedly connected to the inner side of the first bearing part, the outer side of the first bearing part is fixedly connected to the first bearing seat, and the bottom of the first bearing seat is fixedly connected to the ground.

[0011] Further, the grinding bodies are arranged in the lower half of the mill cylinder.

[0012] Further, the number of the grinding blades is odd.

[0013] Further, a sealing cover is arranged at the connection between the mill cylinder and the grinding central shaft, and the sealing cover is used to prevent the powder inside the mill cylinder from overflowing.

[0014] Further, an out-mill lifting device and a discharge grate plate at the mill tail are arranged inside the mill cylinder. The out-mill lifting device is fixedly connected to the mill cylinder, and the discharge grate plate at the mill tail is detachably fixedly connected to the mill cylinder.

[0015] Further, alloy liners and rubber liners are arranged on the inner side of the mill cylinder, and the rubber liners are arranged between the alloy liners and the inner wall of the mill cylinder.

[0016] The beneficial effects of the grinding device driven by a permanent magnet synchronous motor provided by the present invention are as follows: Since the mill cylinder and the grinding central shaft are provided, one end of the grinding central shaft is fixedly connected to the permanent magnet synchronous drive assembly, the grinding central shaft passes through the mill cylinder, and the other end of the grinding central shaft is connected to the first bearing device; a plurality of grinding blades are arranged on a section of the grinding central shaft in the mill cylinder. Among them, the mill cylinder no longer needs to bear the weight by the grinding central shaft, but is fixed on the ground. The remaining weight is borne by the permanent magnet synchronous drive assembly and the first bearing device, and this part of the weight is much less than the weight borne by the traditional main hollow shaft. Therefore, the shaft sleeve, the thin oil station and related components can be removed, thereby reducing the structural complexity and also reducing the requirements for the permanent magnet synchronous drive assembly and the first bearing device, thus reducing the maintenance cost and the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the grinding device driven by a permanent magnet synchronous motor in the axial direction of the grinding central shaft;

[0018] Figure 2 It is a schematic diagram of the grinding device driven by a permanent magnet synchronous motor in the radial direction of the grinding central shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To better understand the purpose, structure, and function of the present invention, the following will further describe in detail a grinding device driven by a permanent magnet synchronous motor of the present invention with reference to the attached Figures 1 to 2 , which is a grinding device driven by a permanent magnet synchronous motor of the present invention.

[0020] As Figures 1 to 2 shown, a grinding device driven by a permanent magnet synchronous motor according to an embodiment of the present invention includes a grinding mill cylinder 100 and a grinding central shaft 200. Among them, the grinding mill cylinder 100 is fixedly connected to the ground. One end of the grinding central shaft 200 is fixedly connected to a permanent magnet synchronous drive assembly, the grinding central shaft 200 passes through the grinding mill cylinder 100, and the other end of the grinding central shaft 200 is connected to a first bearing device; a plurality of grinding blades 210 are provided on a section of the grinding central shaft 200 in the grinding mill cylinder 100, and a grinding body 110 is provided inside the grinding mill cylinder 100. The grinding blades 210 and the grinding body 110 are used for grinding materials; a feeding device 500 is provided on one side of the grinding mill cylinder 100 close to the first bearing device; a discharging device 600 is provided on the top of the grinding mill cylinder 100.

[0021] A plurality of cylinder fixing devices 120 are provided at the bottom of the grinding mill cylinder 100, and the cylinder fixing devices 120 are used to fix the grinding mill cylinder 100 to the ground.

[0022] In the present invention, the grinding mill cylinder 100 is fixed to the ground through the cylinder fixing devices 120. Therefore, the main weight of the grinding device driven by the permanent magnet synchronous motor is borne by the ground, avoiding the main weight being borne by the grinding central shaft 200. Therefore, related components such as journal bearings and thin oil stations can be simplified. The grinding central shaft 200 mainly bears its own gravity and the pressure of the grinding blades 210. The pressure on the grinding central shaft 200 is borne by the permanent magnet synchronous drive assembly and the first bearing device.

[0023] Among them, the permanent magnet synchronous drive assembly is the power source of the grinding central shaft 200. The grinding central shaft 200 is driven to rotate through the permanent magnet synchronous drive assembly, and then the grinding blades 210 rotate. During the rotation of the grinding blades 210, the material is jointly subjected to shear force and extrusion force between the grinding blades 210 and the grinding body 110, becoming finer and finer until the requirements are met.

[0024] The permanent magnet synchronous drive assembly includes a drive motor. The drive motor includes a motor housing 310 and a motor rotor part 320. The motor rotor part 320 is fixedly connected to a coupling 330. The coupling 330 is used to transmit the electromagnetic torque of the motor rotor part 320 to the grinding central shaft 200. The coupling 330 absorbs the impact force during the grinding process through an elastic element or a damping component, thereby protecting the safety of the motor.

[0025] Since the weights of the grinding central shaft 200 and the grinding blades 210 are relatively small, one end of the grinding central shaft 200 connected to the motor rotor part 320 bears torque and part of the gravity through the motor rotor part 320, and the pressure on the motor is also relatively small.

[0026] In the present invention, a second bearing device is connected to one end of the grinding central shaft 200 close to the coupler 330. The second bearing device includes a second bearing part 710 and a second bearing seat 720. The grinding central shaft 200 is fixedly connected to the inner side of the second bearing part 710, the outer side of the second bearing part 710 is fixedly connected to the second bearing seat 720, and the bottom of the second bearing seat 720 is fixedly connected to the ground.

[0027] Part of the gravity of the grinding central shaft 200 is borne by the second bearing device. Since the load on the second bearing seat 720 is relatively low, ordinary grease lubrication is sufficient and additional forced thin oil circulation lubrication is not required. Thus, the thin oil station can be further eliminated.

[0028] The other end of the grinding central shaft 200 is connected to a first bearing device. The first bearing device also bears part of the gravity of the grinding central shaft 200. Since the pressure to be borne is relatively small, a rolling bearing can bear it. The first bearing device includes a first bearing part 410 and a first bearing seat 420. The grinding central shaft 200 is fixedly connected to the inner side of the first bearing part 410, the outer side of the first bearing part 410 is fixedly connected to the first bearing seat 420, and the bottom of the first bearing seat 420 is fixedly connected to the ground.

[0029] In some embodiments, the grinding media 110 are arranged in the lower half of the mill cylinder 100. After grinding, driven by the grinding blades 210, part of the powder will be driven to the upper part of the mill cylinder 100 and collected.

[0030] It can be understood that the number of upper blades of the grinding blades 210 is odd. Since the resultant vector of the centrifugal forces cannot be completely offset when the odd-numbered blades rotate, an asymmetric force field is formed, which can suppress resonance at specific frequencies to a certain extent.

[0031] To improve the tightness of the grinding device driven by the permanent magnet synchronous motor, a sealing cover 800 is provided at the connection between the mill cylinder 100 and the grinding central shaft 200. The sealing cover 800 is used to prevent the powder inside the mill cylinder 100 from overflowing. Since the grinding central shaft 200 passes through the mill cylinder 100, there will be gaps at the connection. After the sealing cover 800 is provided, it can prevent the dust inside the mill cylinder 100 from overflowing into the external air, avoid damage to external equipment, and also avoid dust pollution.

[0032] Understandably, a material lifting device 130 for discharging from the mill and a discharging grate plate 140 at the tail of the mill are arranged inside the mill cylinder 100. The material lifting device 130 for discharging from the mill is fixedly connected to the mill cylinder 100, and the discharging grate plate 140 at the tail of the mill is detachably and fixedly connected to the mill cylinder 100. The discharging grate plate 140 at the tail of the mill is perpendicular to the grinding central shaft 200.

[0033] Since the materials after grinding are likely to accumulate at the tail of the mill due to humidity and adhesion of fine powder, it is necessary to lift the materials through the material lifting device 130 for discharging from the mill for subsequent collection processes. Generally, the rotating lifting plate (or lifting spoon) can be used to scoop up the bottom materials and throw the materials to the area of the discharging grate plate 140 at the tail of the mill through centrifugal force. This design can effectively improve the discharging speed. The discharging grate plate 140 at the tail of the mill uses grate plates with different aperture widths according to needs, so that the powder with a diameter smaller than the aperture diameter can pass through. The detachable design enables the cleaning and replacement of the discharging grate plate 140 at the tail of the mill during the later maintenance process. In order to improve the discharging efficiency, the discharging device 600 can adopt a negative pressure collector to collect the qualified products screened by the discharging grate plate 140 at the tail of the mill through the pressure difference inside and outside the discharging device 600, and the unqualified materials that do not pass through the screening of the discharging grate plate 140 at the tail of the mill will be continuously sheared and ground. For the feeding device 500, an HDR (High-temperature Decomposition Reactor) feeding device can be adopted. When the discharging device 600 continuously collects the qualified products, the feeding device 500 continuously inputs materials to maintain the normal operation of the whole grinding work.

[0034] In the present invention, an alloy lining plate 150 and a rubber lining plate 160 are arranged inside the mill cylinder 100, and the rubber lining plate 160 is arranged between the alloy lining plate 150 and the inner wall of the mill cylinder 100. Among them, the rubber lining plate 160 can absorb impacts to prevent the mill cylinder 100 from micro-deformation and reduce noise. The alloy lining plate 150 can resist high-pressure wear and impact, and improve the wear resistance of the mill cylinder 100.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grinding device driven by a permanent magnet synchronous motor, characterized in that, It includes a mill cylinder (100) and a grinding central shaft (200). The mill cylinder (100) is fixedly connected to the ground. One end of the grinding central shaft (200) is fixedly connected to a permanent magnet synchronous drive assembly. The grinding central shaft (200) passes through the mill cylinder (100), and the other end of the grinding central shaft (200) is connected to a first bearing device. A number of grinding blades (210) are provided on a section of the grinding central shaft (200) within the mill cylinder (100). Grinding media (110) are arranged inside the mill cylinder (100). The grinding blades (210) and the grinding media (110) are used for grinding materials. A feeding device (500) is provided on one side of the mill cylinder (100) close to the first bearing device. A discharging device (600) is provided at the top of the mill cylinder (100).

2. The grinding device driven by a permanent magnet synchronous motor according to claim 1, characterized in that, A number of cylinder fixing devices (120) are provided at the bottom of the mill cylinder (100). The cylinder fixing devices (120) are used to fix the mill cylinder (100) to the ground.

3. The grinding device driven by a permanent magnet synchronous motor according to claim 1, characterized in that, The permanent magnet synchronous drive assembly includes a drive motor. The drive motor includes a motor housing (310) and a motor rotor part (320). The motor rotor part (320) is fixedly connected to a coupling (330). The coupling (330) is used to transmit the electromagnetic torque of the motor rotor part (320) to the grinding central shaft (200).

4. The grinding device driven by a permanent magnet synchronous motor according to claim 3, characterized in that, One end of the grinding central shaft (200) close to the coupling (330) is connected to a second bearing device. The second bearing device includes a second bearing part (710) and a second bearing seat (720). The grinding central shaft (200) is fixedly connected to the inner side of the second bearing part (710). The outer side of the second bearing part (710) is fixedly connected to the second bearing seat (720). The bottom of the second bearing seat (720) is fixedly connected to the ground.

5. The grinding device driven by a permanent magnet synchronous motor according to claim 1, wherein The first bearing device includes a first bearing part (410) and a first bearing seat (420). The grinding central shaft (200) is fixedly connected to the inner side of the first bearing part (410). The outer side of the first bearing part (410) is fixedly connected to the first bearing seat (420). The bottom of the first bearing seat (420) is fixedly connected to the ground.

6. The grinding device driven by a permanent magnet synchronous motor according to claim 1, wherein, The grinding media (110) are arranged in the lower half of the mill cylinder (100).

7. The grinding device driven by a permanent magnet synchronous motor according to claim 1, characterized in that, The number of the grinding blades (210) is odd.

8. The grinding device driven by a permanent magnet synchronous motor according to claim 1, wherein A seal cover (800) is provided at the connection between the mill cylinder (100) and the grinding central shaft (200). The seal cover (800) is used to prevent the powder inside the mill cylinder (100) from overflowing.

9. The grinding device driven by a permanent magnet synchronous motor according to claim 1, characterized in that, An out-mill material lifting device (130) and a discharge grate plate at the mill tail (140) are arranged inside the mill cylinder (100). The out-mill material lifting device (130) is fixedly connected to the mill cylinder (100). The discharge grate plate at the mill tail (140) is detachably fixedly connected to the mill cylinder (100).

10. The grinding device driven by a permanent magnet synchronous motor according to claim 1, wherein An alloy lining plate (150) and a rubber lining plate (160) are arranged inside the mill cylinder body (100), and the rubber lining plate (160) is arranged between the alloy lining plate (150) and the inner wall of the mill cylinder body (100).

Images